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KVM: MMU: fix check the reserved bits on the gpte of L2

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Current code always uses arch.mmu to check the reserved bits on guest gpte
which is valid only for L1 guest, we should use arch.nested_mmu instead when
we translate gva to gpa for the L2 guest

Fix it by using @mmu instead since it is adapted to the current mmu mode
automatically

The bug can be triggered when nested npt is used and L1 guest and L2 guest
use different mmu mode

Reported-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiao Guangrong 2013-08-05 12:59:19 +08:00 committed by Paolo Bonzini
parent 205befd9a5
commit 027664216d
1 changed files with 1 additions and 2 deletions
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3
arch/x86/kvm/paging_tmpl.h
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@ -218,8 +218,7 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker,
if (unlikely(!is_present_gpte(pte)))
goto error;
if (unlikely(is_rsvd_bits_set(&vcpu->arch.mmu, pte,
walker->level))) {
if (unlikely(is_rsvd_bits_set(mmu, pte, walker->level))) {
errcode |= PFERR_RSVD_MASK | PFERR_PRESENT_MASK;
goto error;
}