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KVM: SVM: Fix nested msr intercept handling

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The nested_svm_exit_handled_msr() function maps only one
page of the guests msr permission bitmap. This patch changes
the code to use kvm_read_guest to fix the bug.

Cc: stable@kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Joerg Roedel 2010-02-19 16:23:05 +01:00 committed by Avi Kivity
parent 6c3bd3d766
commit 4c7da8cb43
1 changed files with 3 additions and 10 deletions
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13
arch/x86/kvm/svm.c
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@ -1461,19 +1461,13 @@ static bool nested_svm_exit_handled_msr(struct vcpu_svm *svm)
{
u32 param = svm->vmcb->control.exit_info_1 & 1;
u32 msr = svm->vcpu.arch.regs[VCPU_REGS_RCX];
struct page *page;
bool ret = false;
u32 t0, t1;
u8 *msrpm;
u8 val;
if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT)))
return false;
msrpm = nested_svm_map(svm, svm->nested.vmcb_msrpm, &page);
if (!msrpm)
goto out;
switch (msr) {
case 0 ... 0x1fff:
t0 = (msr * 2) % 8;
@ -1494,11 +1488,10 @@ static bool nested_svm_exit_handled_msr(struct vcpu_svm *svm)
goto out;
}
ret = msrpm[t1] & ((1 << param) << t0);
if (!kvm_read_guest(svm->vcpu.kvm, svm->nested.vmcb_msrpm + t1, &val, 1))
ret = val & ((1 << param) << t0);
out:
nested_svm_unmap(page);
return ret;
}