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[PATCH] KVM: MMU: Report nx faults to the guest

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With the recent guest page fault change, we perform access checks on our
own instead of relying on the cpu.  This means we have to perform the nx
checks as well.

Software like the google toolbar on windows appears to rely on this
somehow.

Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Avi Kivity
2007-01-26 00:56:41 -08:00
committed by Linus Torvalds
parent 7993ba43db
commit 73b1087e61
2 changed files with 18 additions and 3 deletions
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6
drivers/kvm/mmu.c
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@@ -143,6 +143,7 @@ static int dbg = 1;
#define PFERR_PRESENT_MASK (1U << 0)
#define PFERR_WRITE_MASK (1U << 1)
#define PFERR_USER_MASK (1U << 2)
#define PFERR_FETCH_MASK (1U << 4)
#define PT64_ROOT_LEVEL 4
#define PT32_ROOT_LEVEL 2
@@ -168,6 +169,11 @@ static int is_cpuid_PSE36(void)
return 1;
}
static int is_nx(struct kvm_vcpu *vcpu)
{
return vcpu->shadow_efer & EFER_NX;
}
static int is_present_pte(unsigned long pte)
{
return pte & PT_PRESENT_MASK;