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SubjectRe: [PATCH 32/61] KVM: x86: Handle UMIP emulation CPUID adjustment in VMX code
Date
Sean Christopherson <sean.j.christopherson@intel.com> writes:

> Move the CPUID adjustment for UMIP emulation into VMX code to eliminate
> an instance of the undesirable "unsigned f_* = *_supported ? F(*) : 0"
> pattern in the common CPUID handling code.
>
> No functional change intended.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> ---
> arch/x86/kvm/cpuid.c | 2 --
> arch/x86/kvm/vmx/vmx.c | 2 ++
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
> index a5f150204d73..202a6c0f1db8 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -339,7 +339,6 @@ static int __do_cpuid_func_emulated(struct kvm_cpuid_array *array, u32 func)
>
> static inline void do_cpuid_7_mask(struct kvm_cpuid_entry2 *entry)
> {
> - unsigned f_umip = kvm_x86_ops->umip_emulated() ? F(UMIP) : 0;
> unsigned f_intel_pt = kvm_x86_ops->pt_supported() ? F(INTEL_PT) : 0;
> unsigned f_la57;
> unsigned f_pku = kvm_x86_ops->pku_supported() ? F(PKU) : 0;
> @@ -382,7 +381,6 @@ static inline void do_cpuid_7_mask(struct kvm_cpuid_entry2 *entry)
> cpuid_entry_mask(entry, CPUID_7_ECX);
> /* Set LA57 based on hardware capability. */
> entry->ecx |= f_la57;
> - entry->ecx |= f_umip;
> entry->ecx |= f_pku;
> /* PKU is not yet implemented for shadow paging. */
> if (!tdp_enabled || !boot_cpu_has(X86_FEATURE_OSPKE))
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index 49ee4c600934..9d2e36a5ecb9 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -7111,6 +7111,8 @@ static void vmx_set_supported_cpuid(struct kvm_cpuid_entry2 *entry)
> cpuid_entry_set(entry, X86_FEATURE_MPX);
> if (boot_cpu_has(X86_FEATURE_INVPCID) && cpu_has_vmx_invpcid())
> cpuid_entry_set(entry, X86_FEATURE_INVPCID);
> + if (vmx_umip_emulated())
> + cpuid_entry_set(entry, X86_FEATURE_UMIP);
> break;
> default:
> break;

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>

--
Vitaly

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