KVM: Fix guest sysenter on vmx

The vmx code currently treats the guest's sysenter support msrs as 32-bit
values, which breaks 32-bit compat mode userspace on 64-bit guests.  Fix by
using the native word width of the machine.

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

diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index c07178e..bfa0ce4 100644 (file)
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -371,10 +371,10 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
                data = vmcs_read32(GUEST_SYSENTER_CS);
                break;
        case MSR_IA32_SYSENTER_EIP:
-               data = vmcs_read32(GUEST_SYSENTER_EIP);
+               data = vmcs_readl(GUEST_SYSENTER_EIP);
                break;
        case MSR_IA32_SYSENTER_ESP:
-               data = vmcs_read32(GUEST_SYSENTER_ESP);
+               data = vmcs_readl(GUEST_SYSENTER_ESP);
                break;
        default:
                msr = find_msr_entry(vcpu, msr_index);
@@ -412,10 +412,10 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
                vmcs_write32(GUEST_SYSENTER_CS, data);
                break;
        case MSR_IA32_SYSENTER_EIP:
-               vmcs_write32(GUEST_SYSENTER_EIP, data);
+               vmcs_writel(GUEST_SYSENTER_EIP, data);
                break;
        case MSR_IA32_SYSENTER_ESP:
-               vmcs_write32(GUEST_SYSENTER_ESP, data);
+               vmcs_writel(GUEST_SYSENTER_ESP, data);
                break;
        case MSR_IA32_TIME_STAMP_COUNTER:
                guest_write_tsc(data);