diff options
| -rw-r--r-- | arch/x86/kvm/vmx/vmx.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 1c8b2b6e7ed9..9a8cd7f8481e 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -1074,8 +1074,12 @@ static void pt_guest_exit(struct vcpu_vmx *vmx) pt_load_msr(&vmx->pt_desc.host, vmx->pt_desc.addr_range); } - /* Reload host state (IA32_RTIT_CTL will be cleared on VM exit). */ - wrmsrl(MSR_IA32_RTIT_CTL, vmx->pt_desc.host.ctl); + /* + * KVM requires VM_EXIT_CLEAR_IA32_RTIT_CTL to expose PT to the guest, + * i.e. RTIT_CTL is always cleared on VM-Exit. Restore it if necessary. + */ + if (vmx->pt_desc.host.ctl) + wrmsrl(MSR_IA32_RTIT_CTL, vmx->pt_desc.host.ctl); } void vmx_set_host_fs_gs(struct vmcs_host_state *host, u16 fs_sel, u16 gs_sel, |