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KVM: PPC: e500: Eliminate shadow_pages[], and use pfns instead. 

This is in line with what other architectures do, and will allow us to
map things other than ordinary, unreserved kernel pages -- such as
dedicated devices, or large contiguous reserved regions.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Scott Wood 2011-06-14 18:34:37 -05:00 committed by Avi Kivity
parent 0ef309956c
commit 59c1f4e35c
2 changed files with 19 additions and 39 deletions
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2
arch/powerpc/include/asm/kvm_e500.h
View File

@ -34,8 +34,6 @@ struct kvmppc_vcpu_e500 {
struct tlbe *guest_tlb[E500_TLB_NUM];
/* TLB that's actually used when the guest is running. */
struct tlbe *shadow_tlb[E500_TLB_NUM];
/* Pages which are referenced in the shadow TLB. */
struct page **shadow_pages[E500_TLB_NUM];
unsigned int guest_tlb_size[E500_TLB_NUM];
unsigned int shadow_tlb_size[E500_TLB_NUM];

56
arch/powerpc/kvm/e500_tlb.c
View File

@ -188,17 +188,16 @@ static void kvmppc_e500_shadow_release(struct kvmppc_vcpu_e500 *vcpu_e500,
int tlbsel, int esel)
{
struct tlbe *stlbe = &vcpu_e500->shadow_tlb[tlbsel][esel];
struct page *page = vcpu_e500->shadow_pages[tlbsel][esel];
unsigned long pfn;
if (page) {
vcpu_e500->shadow_pages[tlbsel][esel] = NULL;
pfn = stlbe->mas3 >> PAGE_SHIFT;
pfn |= stlbe->mas7 << (32 - PAGE_SHIFT);
if (get_tlb_v(stlbe)) {
if (tlbe_is_writable(stlbe))
kvm_release_page_dirty(page);
else
kvm_release_page_clean(page);
}
if (get_tlb_v(stlbe)) {
if (tlbe_is_writable(stlbe))
kvm_release_pfn_dirty(pfn);
else
kvm_release_pfn_clean(pfn);
}
}
@ -271,37 +270,36 @@ static inline void kvmppc_e500_deliver_tlb_miss(struct kvm_vcpu *vcpu,
static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
u64 gvaddr, gfn_t gfn, struct tlbe *gtlbe, int tlbsel, int esel)
{
struct page *new_page;
struct tlbe *stlbe;
hpa_t hpaddr;
unsigned long pfn;
stlbe = &vcpu_e500->shadow_tlb[tlbsel][esel];
/* Get reference to new page. */
new_page = gfn_to_page(vcpu_e500->vcpu.kvm, gfn);
if (is_error_page(new_page)) {
printk(KERN_ERR "Couldn't get guest page for gfn %lx!\n",
/*
* Translate guest physical to true physical, acquiring
* a page reference if it is normal, non-reserved memory.
*/
pfn = gfn_to_pfn(vcpu_e500->vcpu.kvm, gfn);
if (is_error_pfn(pfn)) {
printk(KERN_ERR "Couldn't get real page for gfn %lx!\n",
(long)gfn);
kvm_release_page_clean(new_page);
kvm_release_pfn_clean(pfn);
return;
}
hpaddr = page_to_phys(new_page);
/* Drop reference to old page. */
kvmppc_e500_shadow_release(vcpu_e500, tlbsel, esel);
vcpu_e500->shadow_pages[tlbsel][esel] = new_page;
/* Force TS=1 IPROT=0 TSIZE=4KB for all guest mappings. */
stlbe->mas1 = MAS1_TSIZE(BOOK3E_PAGESZ_4K)
| MAS1_TID(get_tlb_tid(gtlbe)) | MAS1_TS | MAS1_VALID;
stlbe->mas2 = (gvaddr & MAS2_EPN)
| e500_shadow_mas2_attrib(gtlbe->mas2,
vcpu_e500->vcpu.arch.shared->msr & MSR_PR);
stlbe->mas3 = (hpaddr & MAS3_RPN)
stlbe->mas3 = ((pfn << PAGE_SHIFT) & MAS3_RPN)
| e500_shadow_mas3_attrib(gtlbe->mas3,
vcpu_e500->vcpu.arch.shared->msr & MSR_PR);
stlbe->mas7 = (hpaddr >> 32) & MAS7_RPN;
stlbe->mas7 = (pfn >> (32 - PAGE_SHIFT)) & MAS7_RPN;
trace_kvm_stlb_write(index_of(tlbsel, esel), stlbe->mas1, stlbe->mas2,
stlbe->mas3, stlbe->mas7);
@ -712,16 +710,6 @@ int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500)
if (vcpu_e500->shadow_tlb[1] == NULL)
goto err_out_guest1;
vcpu_e500->shadow_pages[0] = (struct page **)
kzalloc(sizeof(struct page *) * KVM_E500_TLB0_SIZE, GFP_KERNEL);
if (vcpu_e500->shadow_pages[0] == NULL)
goto err_out_shadow1;
vcpu_e500->shadow_pages[1] = (struct page **)
kzalloc(sizeof(struct page *) * tlb1_entry_num, GFP_KERNEL);
if (vcpu_e500->shadow_pages[1] == NULL)
goto err_out_page0;
/* Init TLB configuration register */
vcpu_e500->tlb0cfg = mfspr(SPRN_TLB0CFG) & ~0xfffUL;
vcpu_e500->tlb0cfg |= vcpu_e500->guest_tlb_size[0];
@ -730,10 +718,6 @@ int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500)
return 0;
err_out_page0:
kfree(vcpu_e500->shadow_pages[0]);
err_out_shadow1:
kfree(vcpu_e500->shadow_tlb[1]);
err_out_guest1:
kfree(vcpu_e500->guest_tlb[1]);
err_out_shadow0:
@ -746,8 +730,6 @@ err_out:
void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *vcpu_e500)
{
kfree(vcpu_e500->shadow_pages[1]);
kfree(vcpu_e500->shadow_pages[0]);
kfree(vcpu_e500->shadow_tlb[1]);
kfree(vcpu_e500->guest_tlb[1]);
kfree(vcpu_e500->shadow_tlb[0]);