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KVM: MMU: handle page removal with shadow mapping 

Do not assume that a shadow mapping will always point to the same host
frame number.  Fixes crash with madvise(MADV_DONTNEED).

[avi: move after first printk(), add another printk()]

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Marcelo Tosatti 2008-03-17 10:08:18 -03:00 committed by Avi Kivity
parent 4b1a80fa65
commit 15aaa819e2
1 changed files with 12 additions and 1 deletions
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13
arch/x86/kvm/mmu.c
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@ -892,14 +892,25 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,
int *ptwrite, gfn_t gfn, struct page *page)
{
u64 spte;
int was_rmapped = is_rmap_pte(*shadow_pte);
int was_rmapped = 0;
int was_writeble = is_writeble_pte(*shadow_pte);
hfn_t host_pfn = (*shadow_pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;
pgprintk("%s: spte %llx access %x write_fault %d"
" user_fault %d gfn %lx\n",
__FUNCTION__, *shadow_pte, pt_access,
write_fault, user_fault, gfn);
if (is_rmap_pte(*shadow_pte)) {
if (host_pfn != page_to_pfn(page)) {
pgprintk("hfn old %lx new %lx\n",
host_pfn, page_to_pfn(page));
rmap_remove(vcpu->kvm, shadow_pte);
}
else
was_rmapped = 1;
}
/*
* We don't set the accessed bit, since we sometimes want to see
* whether the guest actually used the pte (in order to detect