diff options
| author | Jim Mattson <jmattson@google.com> | 2018-12-05 15:29:01 -0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-12-14 17:59:49 +0100 |
| commit | 84c8c5b8f82f9939b1bcb3b5e25da2b5fc47ab50 (patch) | |
| tree | 812737d82283246f6ded010991a14616e41cf62e /arch/x86/kvm/vmx/vmx.c | |
| parent | db31c8f5af7de0e78f63fd4c255cf3868d667bf4 (diff) | |
| download | linux-84c8c5b8f82f9939b1bcb3b5e25da2b5fc47ab50.tar.bz2 | |
kvm: vmx: Skip all SYSCALL MSRs in setup_msrs() when !EFER.SCE
Like IA32_STAR, IA32_LSTAR and IA32_FMASK only need to contain guest
values on VM-entry when the guest is in long mode and EFER.SCE is set.
Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Peter Shier <pshier@google.com>
Reviewed-by: Marc Orr <marcorr@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx/vmx.c')
| -rw-r--r-- | arch/x86/kvm/vmx/vmx.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 2084db097622..579f4c4144d2 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -1375,19 +1375,19 @@ static void setup_msrs(struct vcpu_vmx *vmx) save_nmsrs = 0; #ifdef CONFIG_X86_64 - if (is_long_mode(&vmx->vcpu)) { - index = __find_msr_index(vmx, MSR_SYSCALL_MASK); + /* + * The SYSCALL MSRs are only needed on long mode guests, and only + * when EFER.SCE is set. + */ + if (is_long_mode(&vmx->vcpu) && (vmx->vcpu.arch.efer & EFER_SCE)) { + index = __find_msr_index(vmx, MSR_STAR); if (index >= 0) move_msr_up(vmx, index, save_nmsrs++); index = __find_msr_index(vmx, MSR_LSTAR); if (index >= 0) move_msr_up(vmx, index, save_nmsrs++); - /* - * MSR_STAR is only needed on long mode guests, and only - * if efer.sce is enabled. - */ - index = __find_msr_index(vmx, MSR_STAR); - if ((index >= 0) && (vmx->vcpu.arch.efer & EFER_SCE)) + index = __find_msr_index(vmx, MSR_SYSCALL_MASK); + if (index >= 0) move_msr_up(vmx, index, save_nmsrs++); } #endif |