[PATCH] KVM: Ignore the writes to MSR_K7_HWCR(3)

[Nicolae Mogoreanu]

From: Nicolae Mogoreanu <mogore...@gmail.com>
KVM: Ignore the writes to MSR_K7_HWCR(3)

When CPUID Fn8000_0001_EAX reports 0x00100f22 Windows 7 x64 guest
tries to set bit 3 in MSRC001_0015 in nt!KiDisableCacheErrataSource
and fails. This patch will ignore this step and allow things to move
on without having to fake CPUID value.

Signed-off-by: Nicolae Mogoreanu <mogore...@gmail.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c9d99e5..289466a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1547,6 +1547,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu,
u32 msr, u64 data)
        case MSR_K7_HWCR:
                data &= ~(u64)0x40;     /* ignore flush filter disable */
                data &= ~(u64)0x100;    /* ignore ignne emulation enable */
+               data &= ~(u64)0x8;      /* ignore TLB cache disable */
                if (data != 0) {
                        pr_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
                                data);
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