![Ian Campbell](/assets/img/avatar_default.png)
Impact: fix Xen guest boot failure
commit eefb47f6a1
("xen: use
spin_lock_nest_lock when pinning a pagetable") changed xen_pgd_walk to
walk over mm->pgd rather than taking pgd as an argument.
This breaks xen_mm_(un)pin_all() because it makes init_mm.pgd readonly
instead of the pgd we are interested in and therefore the pin subsequently
fails.
(XEN) mm.c:2280:d15 Bad type (saw 00000000e8000001 != exp 0000000060000000) for mfn bc464 (pfn 21ca7)
(XEN) mm.c:2665:d15 Error while pinning mfn bc464
[ 14.586913] 1 multicall(s) failed: cpu 0
[ 14.586926] Pid: 14, comm: kstop/0 Not tainted 2.6.28-rc5-x86_32p-xenU-00172-gee2f6cc #200
[ 14.586940] Call Trace:
[ 14.586955] [<c030c17a>] ? printk+0x18/0x1e
[ 14.586972] [<c0103df3>] xen_mc_flush+0x163/0x1d0
[ 14.586986] [<c0104bc1>] __xen_pgd_pin+0xa1/0x110
[ 14.587000] [<c015a330>] ? stop_cpu+0x0/0xf0
[ 14.587015] [<c0104d7b>] xen_mm_pin_all+0x4b/0x70
[ 14.587029] [<c022bcb9>] xen_suspend+0x39/0xe0
[ 14.587042] [<c015a330>] ? stop_cpu+0x0/0xf0
[ 14.587054] [<c015a3cd>] stop_cpu+0x9d/0xf0
[ 14.587067] [<c01417cd>] run_workqueue+0x8d/0x150
[ 14.587080] [<c030e4b3>] ? _spin_unlock_irqrestore+0x23/0x40
[ 14.587094] [<c014558a>] ? prepare_to_wait+0x3a/0x70
[ 14.587107] [<c0141918>] worker_thread+0x88/0xf0
[ 14.587120] [<c01453c0>] ? autoremove_wake_function+0x0/0x50
[ 14.587133] [<c0141890>] ? worker_thread+0x0/0xf0
[ 14.587146] [<c014509c>] kthread+0x3c/0x70
[ 14.587157] [<c0145060>] ? kthread+0x0/0x70
[ 14.587170] [<c0109d1b>] kernel_thread_helper+0x7/0x10
[ 14.587181] call 1/3: op=14 arg=[c0415000] result=0
[ 14.587192] call 2/3: op=14 arg=[e1ca2000] result=0
[ 14.587204] call 3/3: op=26 arg=[c1808860] result=-22
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
1208 lines
30 KiB
C
1208 lines
30 KiB
C
/*
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* Xen mmu operations
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*
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* This file contains the various mmu fetch and update operations.
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* The most important job they must perform is the mapping between the
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* domain's pfn and the overall machine mfns.
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*
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* Xen allows guests to directly update the pagetable, in a controlled
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* fashion. In other words, the guest modifies the same pagetable
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* that the CPU actually uses, which eliminates the overhead of having
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* a separate shadow pagetable.
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*
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* In order to allow this, it falls on the guest domain to map its
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* notion of a "physical" pfn - which is just a domain-local linear
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* address - into a real "machine address" which the CPU's MMU can
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* use.
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*
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* A pgd_t/pmd_t/pte_t will typically contain an mfn, and so can be
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* inserted directly into the pagetable. When creating a new
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* pte/pmd/pgd, it converts the passed pfn into an mfn. Conversely,
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* when reading the content back with __(pgd|pmd|pte)_val, it converts
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* the mfn back into a pfn.
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*
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* The other constraint is that all pages which make up a pagetable
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* must be mapped read-only in the guest. This prevents uncontrolled
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* guest updates to the pagetable. Xen strictly enforces this, and
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* will disallow any pagetable update which will end up mapping a
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* pagetable page RW, and will disallow using any writable page as a
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* pagetable.
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*
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* Naively, when loading %cr3 with the base of a new pagetable, Xen
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* would need to validate the whole pagetable before going on.
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* Naturally, this is quite slow. The solution is to "pin" a
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* pagetable, which enforces all the constraints on the pagetable even
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* when it is not actively in use. This menas that Xen can be assured
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* that it is still valid when you do load it into %cr3, and doesn't
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* need to revalidate it.
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*
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* Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
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*/
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#include <linux/sched.h>
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#include <linux/highmem.h>
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#include <linux/debugfs.h>
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#include <linux/bug.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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#include <asm/fixmap.h>
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#include <asm/mmu_context.h>
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#include <asm/paravirt.h>
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#include <asm/linkage.h>
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#include <asm/xen/hypercall.h>
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#include <asm/xen/hypervisor.h>
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#include <xen/page.h>
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#include <xen/interface/xen.h>
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#include "multicalls.h"
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#include "mmu.h"
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#include "debugfs.h"
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#define MMU_UPDATE_HISTO 30
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#ifdef CONFIG_XEN_DEBUG_FS
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static struct {
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u32 pgd_update;
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u32 pgd_update_pinned;
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u32 pgd_update_batched;
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u32 pud_update;
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u32 pud_update_pinned;
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u32 pud_update_batched;
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u32 pmd_update;
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u32 pmd_update_pinned;
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u32 pmd_update_batched;
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u32 pte_update;
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u32 pte_update_pinned;
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u32 pte_update_batched;
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u32 mmu_update;
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u32 mmu_update_extended;
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u32 mmu_update_histo[MMU_UPDATE_HISTO];
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u32 prot_commit;
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u32 prot_commit_batched;
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u32 set_pte_at;
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u32 set_pte_at_batched;
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u32 set_pte_at_pinned;
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u32 set_pte_at_current;
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u32 set_pte_at_kernel;
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} mmu_stats;
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static u8 zero_stats;
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static inline void check_zero(void)
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{
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if (unlikely(zero_stats)) {
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memset(&mmu_stats, 0, sizeof(mmu_stats));
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zero_stats = 0;
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}
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}
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#define ADD_STATS(elem, val) \
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do { check_zero(); mmu_stats.elem += (val); } while(0)
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#else /* !CONFIG_XEN_DEBUG_FS */
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#define ADD_STATS(elem, val) do { (void)(val); } while(0)
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#endif /* CONFIG_XEN_DEBUG_FS */
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/*
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* Just beyond the highest usermode address. STACK_TOP_MAX has a
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* redzone above it, so round it up to a PGD boundary.
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*/
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#define USER_LIMIT ((STACK_TOP_MAX + PGDIR_SIZE - 1) & PGDIR_MASK)
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#define P2M_ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
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#define TOP_ENTRIES (MAX_DOMAIN_PAGES / P2M_ENTRIES_PER_PAGE)
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/* Placeholder for holes in the address space */
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static unsigned long p2m_missing[P2M_ENTRIES_PER_PAGE] __page_aligned_data =
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{ [ 0 ... P2M_ENTRIES_PER_PAGE-1 ] = ~0UL };
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/* Array of pointers to pages containing p2m entries */
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static unsigned long *p2m_top[TOP_ENTRIES] __page_aligned_data =
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{ [ 0 ... TOP_ENTRIES - 1] = &p2m_missing[0] };
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/* Arrays of p2m arrays expressed in mfns used for save/restore */
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static unsigned long p2m_top_mfn[TOP_ENTRIES] __page_aligned_bss;
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static unsigned long p2m_top_mfn_list[TOP_ENTRIES / P2M_ENTRIES_PER_PAGE]
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__page_aligned_bss;
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static inline unsigned p2m_top_index(unsigned long pfn)
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{
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BUG_ON(pfn >= MAX_DOMAIN_PAGES);
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return pfn / P2M_ENTRIES_PER_PAGE;
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}
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static inline unsigned p2m_index(unsigned long pfn)
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{
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return pfn % P2M_ENTRIES_PER_PAGE;
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}
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/* Build the parallel p2m_top_mfn structures */
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void xen_setup_mfn_list_list(void)
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{
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unsigned pfn, idx;
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for(pfn = 0; pfn < MAX_DOMAIN_PAGES; pfn += P2M_ENTRIES_PER_PAGE) {
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unsigned topidx = p2m_top_index(pfn);
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p2m_top_mfn[topidx] = virt_to_mfn(p2m_top[topidx]);
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}
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for(idx = 0; idx < ARRAY_SIZE(p2m_top_mfn_list); idx++) {
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unsigned topidx = idx * P2M_ENTRIES_PER_PAGE;
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p2m_top_mfn_list[idx] = virt_to_mfn(&p2m_top_mfn[topidx]);
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}
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BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info);
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HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list =
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virt_to_mfn(p2m_top_mfn_list);
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HYPERVISOR_shared_info->arch.max_pfn = xen_start_info->nr_pages;
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}
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/* Set up p2m_top to point to the domain-builder provided p2m pages */
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void __init xen_build_dynamic_phys_to_machine(void)
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{
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unsigned long *mfn_list = (unsigned long *)xen_start_info->mfn_list;
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unsigned long max_pfn = min(MAX_DOMAIN_PAGES, xen_start_info->nr_pages);
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unsigned pfn;
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for(pfn = 0; pfn < max_pfn; pfn += P2M_ENTRIES_PER_PAGE) {
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unsigned topidx = p2m_top_index(pfn);
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p2m_top[topidx] = &mfn_list[pfn];
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}
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}
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unsigned long get_phys_to_machine(unsigned long pfn)
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{
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unsigned topidx, idx;
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if (unlikely(pfn >= MAX_DOMAIN_PAGES))
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return INVALID_P2M_ENTRY;
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topidx = p2m_top_index(pfn);
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idx = p2m_index(pfn);
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return p2m_top[topidx][idx];
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}
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EXPORT_SYMBOL_GPL(get_phys_to_machine);
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static void alloc_p2m(unsigned long **pp, unsigned long *mfnp)
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{
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unsigned long *p;
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unsigned i;
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p = (void *)__get_free_page(GFP_KERNEL | __GFP_NOFAIL);
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BUG_ON(p == NULL);
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for(i = 0; i < P2M_ENTRIES_PER_PAGE; i++)
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p[i] = INVALID_P2M_ENTRY;
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if (cmpxchg(pp, p2m_missing, p) != p2m_missing)
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free_page((unsigned long)p);
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else
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*mfnp = virt_to_mfn(p);
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}
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void set_phys_to_machine(unsigned long pfn, unsigned long mfn)
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{
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unsigned topidx, idx;
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if (unlikely(xen_feature(XENFEAT_auto_translated_physmap))) {
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BUG_ON(pfn != mfn && mfn != INVALID_P2M_ENTRY);
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return;
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}
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if (unlikely(pfn >= MAX_DOMAIN_PAGES)) {
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BUG_ON(mfn != INVALID_P2M_ENTRY);
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return;
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}
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topidx = p2m_top_index(pfn);
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if (p2m_top[topidx] == p2m_missing) {
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/* no need to allocate a page to store an invalid entry */
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if (mfn == INVALID_P2M_ENTRY)
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return;
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alloc_p2m(&p2m_top[topidx], &p2m_top_mfn[topidx]);
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}
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idx = p2m_index(pfn);
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p2m_top[topidx][idx] = mfn;
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}
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xmaddr_t arbitrary_virt_to_machine(void *vaddr)
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{
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unsigned long address = (unsigned long)vaddr;
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unsigned int level;
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pte_t *pte;
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unsigned offset;
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/*
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* if the PFN is in the linear mapped vaddr range, we can just use
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* the (quick) virt_to_machine() p2m lookup
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*/
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if (virt_addr_valid(vaddr))
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return virt_to_machine(vaddr);
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/* otherwise we have to do a (slower) full page-table walk */
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pte = lookup_address(address, &level);
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BUG_ON(pte == NULL);
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offset = address & ~PAGE_MASK;
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return XMADDR(((phys_addr_t)pte_mfn(*pte) << PAGE_SHIFT) + offset);
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}
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void make_lowmem_page_readonly(void *vaddr)
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{
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pte_t *pte, ptev;
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unsigned long address = (unsigned long)vaddr;
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unsigned int level;
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pte = lookup_address(address, &level);
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BUG_ON(pte == NULL);
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ptev = pte_wrprotect(*pte);
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if (HYPERVISOR_update_va_mapping(address, ptev, 0))
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BUG();
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}
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void make_lowmem_page_readwrite(void *vaddr)
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{
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pte_t *pte, ptev;
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unsigned long address = (unsigned long)vaddr;
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unsigned int level;
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pte = lookup_address(address, &level);
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BUG_ON(pte == NULL);
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ptev = pte_mkwrite(*pte);
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if (HYPERVISOR_update_va_mapping(address, ptev, 0))
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BUG();
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}
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static bool xen_page_pinned(void *ptr)
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{
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struct page *page = virt_to_page(ptr);
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return PagePinned(page);
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}
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static void xen_extend_mmu_update(const struct mmu_update *update)
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{
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struct multicall_space mcs;
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struct mmu_update *u;
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mcs = xen_mc_extend_args(__HYPERVISOR_mmu_update, sizeof(*u));
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if (mcs.mc != NULL) {
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ADD_STATS(mmu_update_extended, 1);
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ADD_STATS(mmu_update_histo[mcs.mc->args[1]], -1);
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mcs.mc->args[1]++;
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if (mcs.mc->args[1] < MMU_UPDATE_HISTO)
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ADD_STATS(mmu_update_histo[mcs.mc->args[1]], 1);
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else
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ADD_STATS(mmu_update_histo[0], 1);
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} else {
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ADD_STATS(mmu_update, 1);
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mcs = __xen_mc_entry(sizeof(*u));
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MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
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ADD_STATS(mmu_update_histo[1], 1);
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}
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u = mcs.args;
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*u = *update;
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}
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void xen_set_pmd_hyper(pmd_t *ptr, pmd_t val)
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{
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struct mmu_update u;
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preempt_disable();
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xen_mc_batch();
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/* ptr may be ioremapped for 64-bit pagetable setup */
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u.ptr = arbitrary_virt_to_machine(ptr).maddr;
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u.val = pmd_val_ma(val);
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xen_extend_mmu_update(&u);
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ADD_STATS(pmd_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
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xen_mc_issue(PARAVIRT_LAZY_MMU);
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preempt_enable();
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}
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void xen_set_pmd(pmd_t *ptr, pmd_t val)
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{
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ADD_STATS(pmd_update, 1);
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/* If page is not pinned, we can just update the entry
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directly */
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if (!xen_page_pinned(ptr)) {
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*ptr = val;
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return;
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}
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ADD_STATS(pmd_update_pinned, 1);
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xen_set_pmd_hyper(ptr, val);
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}
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/*
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* Associate a virtual page frame with a given physical page frame
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* and protection flags for that frame.
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*/
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void set_pte_mfn(unsigned long vaddr, unsigned long mfn, pgprot_t flags)
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{
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set_pte_vaddr(vaddr, mfn_pte(mfn, flags));
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}
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void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pteval)
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{
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/* updates to init_mm may be done without lock */
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if (mm == &init_mm)
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preempt_disable();
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ADD_STATS(set_pte_at, 1);
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// ADD_STATS(set_pte_at_pinned, xen_page_pinned(ptep));
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ADD_STATS(set_pte_at_current, mm == current->mm);
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ADD_STATS(set_pte_at_kernel, mm == &init_mm);
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if (mm == current->mm || mm == &init_mm) {
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if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU) {
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struct multicall_space mcs;
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mcs = xen_mc_entry(0);
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MULTI_update_va_mapping(mcs.mc, addr, pteval, 0);
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ADD_STATS(set_pte_at_batched, 1);
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xen_mc_issue(PARAVIRT_LAZY_MMU);
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goto out;
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} else
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if (HYPERVISOR_update_va_mapping(addr, pteval, 0) == 0)
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goto out;
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}
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xen_set_pte(ptep, pteval);
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out:
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if (mm == &init_mm)
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preempt_enable();
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}
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pte_t xen_ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
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{
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/* Just return the pte as-is. We preserve the bits on commit */
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return *ptep;
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}
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void xen_ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte)
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{
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struct mmu_update u;
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xen_mc_batch();
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u.ptr = arbitrary_virt_to_machine(ptep).maddr | MMU_PT_UPDATE_PRESERVE_AD;
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u.val = pte_val_ma(pte);
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xen_extend_mmu_update(&u);
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ADD_STATS(prot_commit, 1);
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ADD_STATS(prot_commit_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
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xen_mc_issue(PARAVIRT_LAZY_MMU);
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}
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/* Assume pteval_t is equivalent to all the other *val_t types. */
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static pteval_t pte_mfn_to_pfn(pteval_t val)
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{
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if (val & _PAGE_PRESENT) {
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|
unsigned long mfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
|
|
pteval_t flags = val & PTE_FLAGS_MASK;
|
|
val = ((pteval_t)mfn_to_pfn(mfn) << PAGE_SHIFT) | flags;
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
static pteval_t pte_pfn_to_mfn(pteval_t val)
|
|
{
|
|
if (val & _PAGE_PRESENT) {
|
|
unsigned long pfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
|
|
pteval_t flags = val & PTE_FLAGS_MASK;
|
|
val = ((pteval_t)pfn_to_mfn(pfn) << PAGE_SHIFT) | flags;
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
pteval_t xen_pte_val(pte_t pte)
|
|
{
|
|
return pte_mfn_to_pfn(pte.pte);
|
|
}
|
|
|
|
pgdval_t xen_pgd_val(pgd_t pgd)
|
|
{
|
|
return pte_mfn_to_pfn(pgd.pgd);
|
|
}
|
|
|
|
pte_t xen_make_pte(pteval_t pte)
|
|
{
|
|
pte = pte_pfn_to_mfn(pte);
|
|
return native_make_pte(pte);
|
|
}
|
|
|
|
pgd_t xen_make_pgd(pgdval_t pgd)
|
|
{
|
|
pgd = pte_pfn_to_mfn(pgd);
|
|
return native_make_pgd(pgd);
|
|
}
|
|
|
|
pmdval_t xen_pmd_val(pmd_t pmd)
|
|
{
|
|
return pte_mfn_to_pfn(pmd.pmd);
|
|
}
|
|
|
|
void xen_set_pud_hyper(pud_t *ptr, pud_t val)
|
|
{
|
|
struct mmu_update u;
|
|
|
|
preempt_disable();
|
|
|
|
xen_mc_batch();
|
|
|
|
/* ptr may be ioremapped for 64-bit pagetable setup */
|
|
u.ptr = arbitrary_virt_to_machine(ptr).maddr;
|
|
u.val = pud_val_ma(val);
|
|
xen_extend_mmu_update(&u);
|
|
|
|
ADD_STATS(pud_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
|
|
|
|
xen_mc_issue(PARAVIRT_LAZY_MMU);
|
|
|
|
preempt_enable();
|
|
}
|
|
|
|
void xen_set_pud(pud_t *ptr, pud_t val)
|
|
{
|
|
ADD_STATS(pud_update, 1);
|
|
|
|
/* If page is not pinned, we can just update the entry
|
|
directly */
|
|
if (!xen_page_pinned(ptr)) {
|
|
*ptr = val;
|
|
return;
|
|
}
|
|
|
|
ADD_STATS(pud_update_pinned, 1);
|
|
|
|
xen_set_pud_hyper(ptr, val);
|
|
}
|
|
|
|
void xen_set_pte(pte_t *ptep, pte_t pte)
|
|
{
|
|
ADD_STATS(pte_update, 1);
|
|
// ADD_STATS(pte_update_pinned, xen_page_pinned(ptep));
|
|
ADD_STATS(pte_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
|
|
|
|
#ifdef CONFIG_X86_PAE
|
|
ptep->pte_high = pte.pte_high;
|
|
smp_wmb();
|
|
ptep->pte_low = pte.pte_low;
|
|
#else
|
|
*ptep = pte;
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_X86_PAE
|
|
void xen_set_pte_atomic(pte_t *ptep, pte_t pte)
|
|
{
|
|
set_64bit((u64 *)ptep, native_pte_val(pte));
|
|
}
|
|
|
|
void xen_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
|
|
{
|
|
ptep->pte_low = 0;
|
|
smp_wmb(); /* make sure low gets written first */
|
|
ptep->pte_high = 0;
|
|
}
|
|
|
|
void xen_pmd_clear(pmd_t *pmdp)
|
|
{
|
|
set_pmd(pmdp, __pmd(0));
|
|
}
|
|
#endif /* CONFIG_X86_PAE */
|
|
|
|
pmd_t xen_make_pmd(pmdval_t pmd)
|
|
{
|
|
pmd = pte_pfn_to_mfn(pmd);
|
|
return native_make_pmd(pmd);
|
|
}
|
|
|
|
#if PAGETABLE_LEVELS == 4
|
|
pudval_t xen_pud_val(pud_t pud)
|
|
{
|
|
return pte_mfn_to_pfn(pud.pud);
|
|
}
|
|
|
|
pud_t xen_make_pud(pudval_t pud)
|
|
{
|
|
pud = pte_pfn_to_mfn(pud);
|
|
|
|
return native_make_pud(pud);
|
|
}
|
|
|
|
pgd_t *xen_get_user_pgd(pgd_t *pgd)
|
|
{
|
|
pgd_t *pgd_page = (pgd_t *)(((unsigned long)pgd) & PAGE_MASK);
|
|
unsigned offset = pgd - pgd_page;
|
|
pgd_t *user_ptr = NULL;
|
|
|
|
if (offset < pgd_index(USER_LIMIT)) {
|
|
struct page *page = virt_to_page(pgd_page);
|
|
user_ptr = (pgd_t *)page->private;
|
|
if (user_ptr)
|
|
user_ptr += offset;
|
|
}
|
|
|
|
return user_ptr;
|
|
}
|
|
|
|
static void __xen_set_pgd_hyper(pgd_t *ptr, pgd_t val)
|
|
{
|
|
struct mmu_update u;
|
|
|
|
u.ptr = virt_to_machine(ptr).maddr;
|
|
u.val = pgd_val_ma(val);
|
|
xen_extend_mmu_update(&u);
|
|
}
|
|
|
|
/*
|
|
* Raw hypercall-based set_pgd, intended for in early boot before
|
|
* there's a page structure. This implies:
|
|
* 1. The only existing pagetable is the kernel's
|
|
* 2. It is always pinned
|
|
* 3. It has no user pagetable attached to it
|
|
*/
|
|
void __init xen_set_pgd_hyper(pgd_t *ptr, pgd_t val)
|
|
{
|
|
preempt_disable();
|
|
|
|
xen_mc_batch();
|
|
|
|
__xen_set_pgd_hyper(ptr, val);
|
|
|
|
xen_mc_issue(PARAVIRT_LAZY_MMU);
|
|
|
|
preempt_enable();
|
|
}
|
|
|
|
void xen_set_pgd(pgd_t *ptr, pgd_t val)
|
|
{
|
|
pgd_t *user_ptr = xen_get_user_pgd(ptr);
|
|
|
|
ADD_STATS(pgd_update, 1);
|
|
|
|
/* If page is not pinned, we can just update the entry
|
|
directly */
|
|
if (!xen_page_pinned(ptr)) {
|
|
*ptr = val;
|
|
if (user_ptr) {
|
|
WARN_ON(xen_page_pinned(user_ptr));
|
|
*user_ptr = val;
|
|
}
|
|
return;
|
|
}
|
|
|
|
ADD_STATS(pgd_update_pinned, 1);
|
|
ADD_STATS(pgd_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
|
|
|
|
/* If it's pinned, then we can at least batch the kernel and
|
|
user updates together. */
|
|
xen_mc_batch();
|
|
|
|
__xen_set_pgd_hyper(ptr, val);
|
|
if (user_ptr)
|
|
__xen_set_pgd_hyper(user_ptr, val);
|
|
|
|
xen_mc_issue(PARAVIRT_LAZY_MMU);
|
|
}
|
|
#endif /* PAGETABLE_LEVELS == 4 */
|
|
|
|
/*
|
|
* (Yet another) pagetable walker. This one is intended for pinning a
|
|
* pagetable. This means that it walks a pagetable and calls the
|
|
* callback function on each page it finds making up the page table,
|
|
* at every level. It walks the entire pagetable, but it only bothers
|
|
* pinning pte pages which are below limit. In the normal case this
|
|
* will be STACK_TOP_MAX, but at boot we need to pin up to
|
|
* FIXADDR_TOP.
|
|
*
|
|
* For 32-bit the important bit is that we don't pin beyond there,
|
|
* because then we start getting into Xen's ptes.
|
|
*
|
|
* For 64-bit, we must skip the Xen hole in the middle of the address
|
|
* space, just after the big x86-64 virtual hole.
|
|
*/
|
|
static int __xen_pgd_walk(struct mm_struct *mm, pgd_t *pgd,
|
|
int (*func)(struct mm_struct *mm, struct page *,
|
|
enum pt_level),
|
|
unsigned long limit)
|
|
{
|
|
int flush = 0;
|
|
unsigned hole_low, hole_high;
|
|
unsigned pgdidx_limit, pudidx_limit, pmdidx_limit;
|
|
unsigned pgdidx, pudidx, pmdidx;
|
|
|
|
/* The limit is the last byte to be touched */
|
|
limit--;
|
|
BUG_ON(limit >= FIXADDR_TOP);
|
|
|
|
if (xen_feature(XENFEAT_auto_translated_physmap))
|
|
return 0;
|
|
|
|
/*
|
|
* 64-bit has a great big hole in the middle of the address
|
|
* space, which contains the Xen mappings. On 32-bit these
|
|
* will end up making a zero-sized hole and so is a no-op.
|
|
*/
|
|
hole_low = pgd_index(USER_LIMIT);
|
|
hole_high = pgd_index(PAGE_OFFSET);
|
|
|
|
pgdidx_limit = pgd_index(limit);
|
|
#if PTRS_PER_PUD > 1
|
|
pudidx_limit = pud_index(limit);
|
|
#else
|
|
pudidx_limit = 0;
|
|
#endif
|
|
#if PTRS_PER_PMD > 1
|
|
pmdidx_limit = pmd_index(limit);
|
|
#else
|
|
pmdidx_limit = 0;
|
|
#endif
|
|
|
|
for (pgdidx = 0; pgdidx <= pgdidx_limit; pgdidx++) {
|
|
pud_t *pud;
|
|
|
|
if (pgdidx >= hole_low && pgdidx < hole_high)
|
|
continue;
|
|
|
|
if (!pgd_val(pgd[pgdidx]))
|
|
continue;
|
|
|
|
pud = pud_offset(&pgd[pgdidx], 0);
|
|
|
|
if (PTRS_PER_PUD > 1) /* not folded */
|
|
flush |= (*func)(mm, virt_to_page(pud), PT_PUD);
|
|
|
|
for (pudidx = 0; pudidx < PTRS_PER_PUD; pudidx++) {
|
|
pmd_t *pmd;
|
|
|
|
if (pgdidx == pgdidx_limit &&
|
|
pudidx > pudidx_limit)
|
|
goto out;
|
|
|
|
if (pud_none(pud[pudidx]))
|
|
continue;
|
|
|
|
pmd = pmd_offset(&pud[pudidx], 0);
|
|
|
|
if (PTRS_PER_PMD > 1) /* not folded */
|
|
flush |= (*func)(mm, virt_to_page(pmd), PT_PMD);
|
|
|
|
for (pmdidx = 0; pmdidx < PTRS_PER_PMD; pmdidx++) {
|
|
struct page *pte;
|
|
|
|
if (pgdidx == pgdidx_limit &&
|
|
pudidx == pudidx_limit &&
|
|
pmdidx > pmdidx_limit)
|
|
goto out;
|
|
|
|
if (pmd_none(pmd[pmdidx]))
|
|
continue;
|
|
|
|
pte = pmd_page(pmd[pmdidx]);
|
|
flush |= (*func)(mm, pte, PT_PTE);
|
|
}
|
|
}
|
|
}
|
|
|
|
out:
|
|
/* Do the top level last, so that the callbacks can use it as
|
|
a cue to do final things like tlb flushes. */
|
|
flush |= (*func)(mm, virt_to_page(pgd), PT_PGD);
|
|
|
|
return flush;
|
|
}
|
|
|
|
static int xen_pgd_walk(struct mm_struct *mm,
|
|
int (*func)(struct mm_struct *mm, struct page *,
|
|
enum pt_level),
|
|
unsigned long limit)
|
|
{
|
|
return __xen_pgd_walk(mm, mm->pgd, func, limit);
|
|
}
|
|
|
|
/* If we're using split pte locks, then take the page's lock and
|
|
return a pointer to it. Otherwise return NULL. */
|
|
static spinlock_t *xen_pte_lock(struct page *page, struct mm_struct *mm)
|
|
{
|
|
spinlock_t *ptl = NULL;
|
|
|
|
#if USE_SPLIT_PTLOCKS
|
|
ptl = __pte_lockptr(page);
|
|
spin_lock_nest_lock(ptl, &mm->page_table_lock);
|
|
#endif
|
|
|
|
return ptl;
|
|
}
|
|
|
|
static void xen_pte_unlock(void *v)
|
|
{
|
|
spinlock_t *ptl = v;
|
|
spin_unlock(ptl);
|
|
}
|
|
|
|
static void xen_do_pin(unsigned level, unsigned long pfn)
|
|
{
|
|
struct mmuext_op *op;
|
|
struct multicall_space mcs;
|
|
|
|
mcs = __xen_mc_entry(sizeof(*op));
|
|
op = mcs.args;
|
|
op->cmd = level;
|
|
op->arg1.mfn = pfn_to_mfn(pfn);
|
|
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
|
|
}
|
|
|
|
static int xen_pin_page(struct mm_struct *mm, struct page *page,
|
|
enum pt_level level)
|
|
{
|
|
unsigned pgfl = TestSetPagePinned(page);
|
|
int flush;
|
|
|
|
if (pgfl)
|
|
flush = 0; /* already pinned */
|
|
else if (PageHighMem(page))
|
|
/* kmaps need flushing if we found an unpinned
|
|
highpage */
|
|
flush = 1;
|
|
else {
|
|
void *pt = lowmem_page_address(page);
|
|
unsigned long pfn = page_to_pfn(page);
|
|
struct multicall_space mcs = __xen_mc_entry(0);
|
|
spinlock_t *ptl;
|
|
|
|
flush = 0;
|
|
|
|
/*
|
|
* We need to hold the pagetable lock between the time
|
|
* we make the pagetable RO and when we actually pin
|
|
* it. If we don't, then other users may come in and
|
|
* attempt to update the pagetable by writing it,
|
|
* which will fail because the memory is RO but not
|
|
* pinned, so Xen won't do the trap'n'emulate.
|
|
*
|
|
* If we're using split pte locks, we can't hold the
|
|
* entire pagetable's worth of locks during the
|
|
* traverse, because we may wrap the preempt count (8
|
|
* bits). The solution is to mark RO and pin each PTE
|
|
* page while holding the lock. This means the number
|
|
* of locks we end up holding is never more than a
|
|
* batch size (~32 entries, at present).
|
|
*
|
|
* If we're not using split pte locks, we needn't pin
|
|
* the PTE pages independently, because we're
|
|
* protected by the overall pagetable lock.
|
|
*/
|
|
ptl = NULL;
|
|
if (level == PT_PTE)
|
|
ptl = xen_pte_lock(page, mm);
|
|
|
|
MULTI_update_va_mapping(mcs.mc, (unsigned long)pt,
|
|
pfn_pte(pfn, PAGE_KERNEL_RO),
|
|
level == PT_PGD ? UVMF_TLB_FLUSH : 0);
|
|
|
|
if (ptl) {
|
|
xen_do_pin(MMUEXT_PIN_L1_TABLE, pfn);
|
|
|
|
/* Queue a deferred unlock for when this batch
|
|
is completed. */
|
|
xen_mc_callback(xen_pte_unlock, ptl);
|
|
}
|
|
}
|
|
|
|
return flush;
|
|
}
|
|
|
|
/* This is called just after a mm has been created, but it has not
|
|
been used yet. We need to make sure that its pagetable is all
|
|
read-only, and can be pinned. */
|
|
static void __xen_pgd_pin(struct mm_struct *mm, pgd_t *pgd)
|
|
{
|
|
vm_unmap_aliases();
|
|
|
|
xen_mc_batch();
|
|
|
|
if (__xen_pgd_walk(mm, pgd, xen_pin_page, USER_LIMIT)) {
|
|
/* re-enable interrupts for flushing */
|
|
xen_mc_issue(0);
|
|
|
|
kmap_flush_unused();
|
|
|
|
xen_mc_batch();
|
|
}
|
|
|
|
#ifdef CONFIG_X86_64
|
|
{
|
|
pgd_t *user_pgd = xen_get_user_pgd(pgd);
|
|
|
|
xen_do_pin(MMUEXT_PIN_L4_TABLE, PFN_DOWN(__pa(pgd)));
|
|
|
|
if (user_pgd) {
|
|
xen_pin_page(mm, virt_to_page(user_pgd), PT_PGD);
|
|
xen_do_pin(MMUEXT_PIN_L4_TABLE, PFN_DOWN(__pa(user_pgd)));
|
|
}
|
|
}
|
|
#else /* CONFIG_X86_32 */
|
|
#ifdef CONFIG_X86_PAE
|
|
/* Need to make sure unshared kernel PMD is pinnable */
|
|
xen_pin_page(mm, pgd_page(pgd[pgd_index(TASK_SIZE)]),
|
|
PT_PMD);
|
|
#endif
|
|
xen_do_pin(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(pgd)));
|
|
#endif /* CONFIG_X86_64 */
|
|
xen_mc_issue(0);
|
|
}
|
|
|
|
static void xen_pgd_pin(struct mm_struct *mm)
|
|
{
|
|
__xen_pgd_pin(mm, mm->pgd);
|
|
}
|
|
|
|
/*
|
|
* On save, we need to pin all pagetables to make sure they get their
|
|
* mfns turned into pfns. Search the list for any unpinned pgds and pin
|
|
* them (unpinned pgds are not currently in use, probably because the
|
|
* process is under construction or destruction).
|
|
*
|
|
* Expected to be called in stop_machine() ("equivalent to taking
|
|
* every spinlock in the system"), so the locking doesn't really
|
|
* matter all that much.
|
|
*/
|
|
void xen_mm_pin_all(void)
|
|
{
|
|
unsigned long flags;
|
|
struct page *page;
|
|
|
|
spin_lock_irqsave(&pgd_lock, flags);
|
|
|
|
list_for_each_entry(page, &pgd_list, lru) {
|
|
if (!PagePinned(page)) {
|
|
__xen_pgd_pin(&init_mm, (pgd_t *)page_address(page));
|
|
SetPageSavePinned(page);
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&pgd_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* The init_mm pagetable is really pinned as soon as its created, but
|
|
* that's before we have page structures to store the bits. So do all
|
|
* the book-keeping now.
|
|
*/
|
|
static __init int xen_mark_pinned(struct mm_struct *mm, struct page *page,
|
|
enum pt_level level)
|
|
{
|
|
SetPagePinned(page);
|
|
return 0;
|
|
}
|
|
|
|
void __init xen_mark_init_mm_pinned(void)
|
|
{
|
|
xen_pgd_walk(&init_mm, xen_mark_pinned, FIXADDR_TOP);
|
|
}
|
|
|
|
static int xen_unpin_page(struct mm_struct *mm, struct page *page,
|
|
enum pt_level level)
|
|
{
|
|
unsigned pgfl = TestClearPagePinned(page);
|
|
|
|
if (pgfl && !PageHighMem(page)) {
|
|
void *pt = lowmem_page_address(page);
|
|
unsigned long pfn = page_to_pfn(page);
|
|
spinlock_t *ptl = NULL;
|
|
struct multicall_space mcs;
|
|
|
|
/*
|
|
* Do the converse to pin_page. If we're using split
|
|
* pte locks, we must be holding the lock for while
|
|
* the pte page is unpinned but still RO to prevent
|
|
* concurrent updates from seeing it in this
|
|
* partially-pinned state.
|
|
*/
|
|
if (level == PT_PTE) {
|
|
ptl = xen_pte_lock(page, mm);
|
|
|
|
if (ptl)
|
|
xen_do_pin(MMUEXT_UNPIN_TABLE, pfn);
|
|
}
|
|
|
|
mcs = __xen_mc_entry(0);
|
|
|
|
MULTI_update_va_mapping(mcs.mc, (unsigned long)pt,
|
|
pfn_pte(pfn, PAGE_KERNEL),
|
|
level == PT_PGD ? UVMF_TLB_FLUSH : 0);
|
|
|
|
if (ptl) {
|
|
/* unlock when batch completed */
|
|
xen_mc_callback(xen_pte_unlock, ptl);
|
|
}
|
|
}
|
|
|
|
return 0; /* never need to flush on unpin */
|
|
}
|
|
|
|
/* Release a pagetables pages back as normal RW */
|
|
static void __xen_pgd_unpin(struct mm_struct *mm, pgd_t *pgd)
|
|
{
|
|
xen_mc_batch();
|
|
|
|
xen_do_pin(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
|
|
|
|
#ifdef CONFIG_X86_64
|
|
{
|
|
pgd_t *user_pgd = xen_get_user_pgd(pgd);
|
|
|
|
if (user_pgd) {
|
|
xen_do_pin(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(user_pgd)));
|
|
xen_unpin_page(mm, virt_to_page(user_pgd), PT_PGD);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_X86_PAE
|
|
/* Need to make sure unshared kernel PMD is unpinned */
|
|
xen_unpin_page(mm, pgd_page(pgd[pgd_index(TASK_SIZE)]),
|
|
PT_PMD);
|
|
#endif
|
|
|
|
__xen_pgd_walk(mm, pgd, xen_unpin_page, USER_LIMIT);
|
|
|
|
xen_mc_issue(0);
|
|
}
|
|
|
|
static void xen_pgd_unpin(struct mm_struct *mm)
|
|
{
|
|
__xen_pgd_unpin(mm, mm->pgd);
|
|
}
|
|
|
|
/*
|
|
* On resume, undo any pinning done at save, so that the rest of the
|
|
* kernel doesn't see any unexpected pinned pagetables.
|
|
*/
|
|
void xen_mm_unpin_all(void)
|
|
{
|
|
unsigned long flags;
|
|
struct page *page;
|
|
|
|
spin_lock_irqsave(&pgd_lock, flags);
|
|
|
|
list_for_each_entry(page, &pgd_list, lru) {
|
|
if (PageSavePinned(page)) {
|
|
BUG_ON(!PagePinned(page));
|
|
__xen_pgd_unpin(&init_mm, (pgd_t *)page_address(page));
|
|
ClearPageSavePinned(page);
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&pgd_lock, flags);
|
|
}
|
|
|
|
void xen_activate_mm(struct mm_struct *prev, struct mm_struct *next)
|
|
{
|
|
spin_lock(&next->page_table_lock);
|
|
xen_pgd_pin(next);
|
|
spin_unlock(&next->page_table_lock);
|
|
}
|
|
|
|
void xen_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
|
|
{
|
|
spin_lock(&mm->page_table_lock);
|
|
xen_pgd_pin(mm);
|
|
spin_unlock(&mm->page_table_lock);
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_SMP
|
|
/* Another cpu may still have their %cr3 pointing at the pagetable, so
|
|
we need to repoint it somewhere else before we can unpin it. */
|
|
static void drop_other_mm_ref(void *info)
|
|
{
|
|
struct mm_struct *mm = info;
|
|
struct mm_struct *active_mm;
|
|
|
|
#ifdef CONFIG_X86_64
|
|
active_mm = read_pda(active_mm);
|
|
#else
|
|
active_mm = __get_cpu_var(cpu_tlbstate).active_mm;
|
|
#endif
|
|
|
|
if (active_mm == mm)
|
|
leave_mm(smp_processor_id());
|
|
|
|
/* If this cpu still has a stale cr3 reference, then make sure
|
|
it has been flushed. */
|
|
if (x86_read_percpu(xen_current_cr3) == __pa(mm->pgd)) {
|
|
load_cr3(swapper_pg_dir);
|
|
arch_flush_lazy_cpu_mode();
|
|
}
|
|
}
|
|
|
|
static void xen_drop_mm_ref(struct mm_struct *mm)
|
|
{
|
|
cpumask_t mask;
|
|
unsigned cpu;
|
|
|
|
if (current->active_mm == mm) {
|
|
if (current->mm == mm)
|
|
load_cr3(swapper_pg_dir);
|
|
else
|
|
leave_mm(smp_processor_id());
|
|
arch_flush_lazy_cpu_mode();
|
|
}
|
|
|
|
/* Get the "official" set of cpus referring to our pagetable. */
|
|
mask = mm->cpu_vm_mask;
|
|
|
|
/* It's possible that a vcpu may have a stale reference to our
|
|
cr3, because its in lazy mode, and it hasn't yet flushed
|
|
its set of pending hypercalls yet. In this case, we can
|
|
look at its actual current cr3 value, and force it to flush
|
|
if needed. */
|
|
for_each_online_cpu(cpu) {
|
|
if (per_cpu(xen_current_cr3, cpu) == __pa(mm->pgd))
|
|
cpu_set(cpu, mask);
|
|
}
|
|
|
|
if (!cpus_empty(mask))
|
|
smp_call_function_mask(mask, drop_other_mm_ref, mm, 1);
|
|
}
|
|
#else
|
|
static void xen_drop_mm_ref(struct mm_struct *mm)
|
|
{
|
|
if (current->active_mm == mm)
|
|
load_cr3(swapper_pg_dir);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* While a process runs, Xen pins its pagetables, which means that the
|
|
* hypervisor forces it to be read-only, and it controls all updates
|
|
* to it. This means that all pagetable updates have to go via the
|
|
* hypervisor, which is moderately expensive.
|
|
*
|
|
* Since we're pulling the pagetable down, we switch to use init_mm,
|
|
* unpin old process pagetable and mark it all read-write, which
|
|
* allows further operations on it to be simple memory accesses.
|
|
*
|
|
* The only subtle point is that another CPU may be still using the
|
|
* pagetable because of lazy tlb flushing. This means we need need to
|
|
* switch all CPUs off this pagetable before we can unpin it.
|
|
*/
|
|
void xen_exit_mmap(struct mm_struct *mm)
|
|
{
|
|
get_cpu(); /* make sure we don't move around */
|
|
xen_drop_mm_ref(mm);
|
|
put_cpu();
|
|
|
|
spin_lock(&mm->page_table_lock);
|
|
|
|
/* pgd may not be pinned in the error exit path of execve */
|
|
if (xen_page_pinned(mm->pgd))
|
|
xen_pgd_unpin(mm);
|
|
|
|
spin_unlock(&mm->page_table_lock);
|
|
}
|
|
|
|
#ifdef CONFIG_XEN_DEBUG_FS
|
|
|
|
static struct dentry *d_mmu_debug;
|
|
|
|
static int __init xen_mmu_debugfs(void)
|
|
{
|
|
struct dentry *d_xen = xen_init_debugfs();
|
|
|
|
if (d_xen == NULL)
|
|
return -ENOMEM;
|
|
|
|
d_mmu_debug = debugfs_create_dir("mmu", d_xen);
|
|
|
|
debugfs_create_u8("zero_stats", 0644, d_mmu_debug, &zero_stats);
|
|
|
|
debugfs_create_u32("pgd_update", 0444, d_mmu_debug, &mmu_stats.pgd_update);
|
|
debugfs_create_u32("pgd_update_pinned", 0444, d_mmu_debug,
|
|
&mmu_stats.pgd_update_pinned);
|
|
debugfs_create_u32("pgd_update_batched", 0444, d_mmu_debug,
|
|
&mmu_stats.pgd_update_pinned);
|
|
|
|
debugfs_create_u32("pud_update", 0444, d_mmu_debug, &mmu_stats.pud_update);
|
|
debugfs_create_u32("pud_update_pinned", 0444, d_mmu_debug,
|
|
&mmu_stats.pud_update_pinned);
|
|
debugfs_create_u32("pud_update_batched", 0444, d_mmu_debug,
|
|
&mmu_stats.pud_update_pinned);
|
|
|
|
debugfs_create_u32("pmd_update", 0444, d_mmu_debug, &mmu_stats.pmd_update);
|
|
debugfs_create_u32("pmd_update_pinned", 0444, d_mmu_debug,
|
|
&mmu_stats.pmd_update_pinned);
|
|
debugfs_create_u32("pmd_update_batched", 0444, d_mmu_debug,
|
|
&mmu_stats.pmd_update_pinned);
|
|
|
|
debugfs_create_u32("pte_update", 0444, d_mmu_debug, &mmu_stats.pte_update);
|
|
// debugfs_create_u32("pte_update_pinned", 0444, d_mmu_debug,
|
|
// &mmu_stats.pte_update_pinned);
|
|
debugfs_create_u32("pte_update_batched", 0444, d_mmu_debug,
|
|
&mmu_stats.pte_update_pinned);
|
|
|
|
debugfs_create_u32("mmu_update", 0444, d_mmu_debug, &mmu_stats.mmu_update);
|
|
debugfs_create_u32("mmu_update_extended", 0444, d_mmu_debug,
|
|
&mmu_stats.mmu_update_extended);
|
|
xen_debugfs_create_u32_array("mmu_update_histo", 0444, d_mmu_debug,
|
|
mmu_stats.mmu_update_histo, 20);
|
|
|
|
debugfs_create_u32("set_pte_at", 0444, d_mmu_debug, &mmu_stats.set_pte_at);
|
|
debugfs_create_u32("set_pte_at_batched", 0444, d_mmu_debug,
|
|
&mmu_stats.set_pte_at_batched);
|
|
debugfs_create_u32("set_pte_at_current", 0444, d_mmu_debug,
|
|
&mmu_stats.set_pte_at_current);
|
|
debugfs_create_u32("set_pte_at_kernel", 0444, d_mmu_debug,
|
|
&mmu_stats.set_pte_at_kernel);
|
|
|
|
debugfs_create_u32("prot_commit", 0444, d_mmu_debug, &mmu_stats.prot_commit);
|
|
debugfs_create_u32("prot_commit_batched", 0444, d_mmu_debug,
|
|
&mmu_stats.prot_commit_batched);
|
|
|
|
return 0;
|
|
}
|
|
fs_initcall(xen_mmu_debugfs);
|
|
|
|
#endif /* CONFIG_XEN_DEBUG_FS */
|