KVM: VMX: Flush volatile msrs before emulating rdmsr

Some msrs (notable MSR_KERNEL_GS_BASE) are held in the processor registers
and need to be flushed to the vcpu struture before they can be read.

This fixes cygwin longjmp() failure on Windows x64.

Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index b1fe1422afb18dd4b6bd32fb07d418741407f771..7611af576829d820eba8de4a79d389e8baef7759 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -903,6 +903,7 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
                data = vmcs_readl(GUEST_SYSENTER_ESP);
                break;
        default:
+               vmx_load_host_state(to_vmx(vcpu));
                msr = find_msr_entry(to_vmx(vcpu), msr_index);
                if (msr) {
                        data = msr->data;