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KVM: SVM: Use svm_msrpm_offset in nested_svm_exit_handled_msr

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There is a generic function now to calculate msrpm offsets.
Use that function in nested_svm_exit_handled_msr() remove
the duplicate logic (which had a bug anyway).

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Joerg Roedel 2010-03-01 15:34:38 +01:00 committed by Avi Kivity
parent 323c3d809b
commit 0d6b35378e
1 changed files with 17 additions and 30 deletions
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47
arch/x86/kvm/svm.c
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@ -1660,40 +1660,27 @@ static void nested_svm_unmap(struct page *page)
static int 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];
u32 t0, t1;
int ret;
u8 val;
u32 offset, msr, value;
int write, mask;
if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT)))
return NESTED_EXIT_HOST;
switch (msr) {
case 0 ... 0x1fff:
t0 = (msr * 2) % 8;
t1 = msr / 8;
break;
case 0xc0000000 ... 0xc0001fff:
t0 = (8192 + msr - 0xc0000000) * 2;
t1 = (t0 / 8);
t0 %= 8;
break;
case 0xc0010000 ... 0xc0011fff:
t0 = (16384 + msr - 0xc0010000) * 2;
t1 = (t0 / 8);
t0 %= 8;
break;
default:
ret = NESTED_EXIT_DONE;
goto out;
}
msr = svm->vcpu.arch.regs[VCPU_REGS_RCX];
offset = svm_msrpm_offset(msr);
write = svm->vmcb->control.exit_info_1 & 1;
mask = 1 << ((2 * (msr & 0xf)) + write);
if (!kvm_read_guest(svm->vcpu.kvm, svm->nested.vmcb_msrpm + t1, &val, 1))
ret = val & ((1 << param) << t0) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
if (offset == MSR_INVALID)
return NESTED_EXIT_DONE;
out:
return ret;
/* Offset is in 32 bit units but need in 8 bit units */
offset *= 4;
if (kvm_read_guest(svm->vcpu.kvm, svm->nested.vmcb_msrpm + offset, &value, 4))
return NESTED_EXIT_DONE;
return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
}
static int nested_svm_exit_special(struct vcpu_svm *svm)
@ -1954,8 +1941,8 @@ static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
if (msrpm_offsets[i] == 0xffffffff)
break;
offset = svm->nested.vmcb_msrpm + msrpm_offsets[i];
p = msrpm_offsets[i] / 4;
p = msrpm_offsets[i];
offset = svm->nested.vmcb_msrpm + (p * 4);
if (kvm_read_guest(svm->vcpu.kvm, offset, &value, 4))
return false;