diff mbox series

[49/61] KVM: x86: Override host CPUID results with kvm_cpu_caps

Message ID 20200201185218.24473-50-sean.j.christopherson@intel.com (mailing list archive)
State New, archived
Headers show
Series KVM: x86: Introduce KVM cpu caps | expand

Commit Message

Sean Christopherson Feb. 1, 2020, 6:52 p.m. UTC 
Override CPUID entries with kvm_cpu_caps during KVM_GET_SUPPORTED_CPUID
instead of masking the host CPUID result, which is redundant now that
the host CPUID is incorporated into kvm_cpu_caps at runtime.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/cpuid.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

Comments

Vitaly Kuznetsov Feb. 24, 2020, 10:57 p.m. UTC | #1 
Sean Christopherson <sean.j.christopherson@intel.com> writes:

> Override CPUID entries with kvm_cpu_caps during KVM_GET_SUPPORTED_CPUID
> instead of masking the host CPUID result, which is redundant now that
> the host CPUID is incorporated into kvm_cpu_caps at runtime.
>
> No functional change intended.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> ---
>  arch/x86/kvm/cpuid.c | 28 ++++++++++++++--------------
>  1 file changed, 14 insertions(+), 14 deletions(-)
>
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
> index 4416f2422321..871c0bd04e19 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -261,13 +261,13 @@ int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
>  	return r;
>  }
>  
> -static __always_inline void cpuid_entry_mask(struct kvm_cpuid_entry2 *entry,
> -					     enum cpuid_leafs leaf)
> +static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry,
> +						 enum cpuid_leafs leaf)
>  {
>  	u32 *reg = cpuid_entry_get_reg(entry, leaf * 32);
>  
>  	BUILD_BUG_ON(leaf > ARRAY_SIZE(kvm_cpu_caps));
> -	*reg &= kvm_cpu_caps[leaf];
> +	*reg = kvm_cpu_caps[leaf];
>  }
>  
>  static __always_inline void kvm_cpu_cap_mask(enum cpuid_leafs leaf, u32 mask)
> @@ -488,8 +488,8 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
>  		entry->eax = min(entry->eax, 0x1fU);
>  		break;
>  	case 1:
> -		cpuid_entry_mask(entry, CPUID_1_EDX);
> -		cpuid_entry_mask(entry, CPUID_1_ECX);
> +		cpuid_entry_override(entry, CPUID_1_EDX);
> +		cpuid_entry_override(entry, CPUID_1_ECX);
>  		/* we support x2apic emulation even if host does not support
>  		 * it since we emulate x2apic in software */
>  		cpuid_entry_set(entry, X86_FEATURE_X2APIC);
> @@ -543,9 +543,9 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
>  	/* function 7 has additional index. */
>  	case 7:
>  		entry->eax = min(entry->eax, 1u);
> -		cpuid_entry_mask(entry, CPUID_7_0_EBX);
> -		cpuid_entry_mask(entry, CPUID_7_ECX);
> -		cpuid_entry_mask(entry, CPUID_7_EDX);
> +		cpuid_entry_override(entry, CPUID_7_0_EBX);
> +		cpuid_entry_override(entry, CPUID_7_ECX);
> +		cpuid_entry_override(entry, CPUID_7_EDX);
>  
>  		/* TSC_ADJUST and ARCH_CAPABILITIES are emulated in software. */
>  		cpuid_entry_set(entry, X86_FEATURE_TSC_ADJUST);
> @@ -564,7 +564,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
>  			if (!entry)
>  				goto out;
>  
> -			cpuid_entry_mask(entry, CPUID_7_1_EAX);
> +			cpuid_entry_override(entry, CPUID_7_1_EAX);
>  			entry->ebx = 0;
>  			entry->ecx = 0;
>  			entry->edx = 0;
> @@ -630,7 +630,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
>  		if (!entry)
>  			goto out;
>  
> -		cpuid_entry_mask(entry, CPUID_D_1_EAX);
> +		cpuid_entry_override(entry, CPUID_D_1_EAX);
>  		if (entry->eax & (F(XSAVES)|F(XSAVEC)))
>  			entry->ebx = xstate_required_size(supported_xcr0, true);
>  		else
> @@ -709,8 +709,8 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
>  		entry->eax = min(entry->eax, 0x8000001f);
>  		break;
>  	case 0x80000001:
> -		cpuid_entry_mask(entry, CPUID_8000_0001_EDX);
> -		cpuid_entry_mask(entry, CPUID_8000_0001_ECX);
> +		cpuid_entry_override(entry, CPUID_8000_0001_EDX);
> +		cpuid_entry_override(entry, CPUID_8000_0001_ECX);
>  		break;
>  	case 0x80000007: /* Advanced power management */
>  		/* invariant TSC is CPUID.80000007H:EDX[8] */
> @@ -728,7 +728,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
>  			g_phys_as = phys_as;
>  		entry->eax = g_phys_as | (virt_as << 8);
>  		entry->edx = 0;
> -		cpuid_entry_mask(entry, CPUID_8000_0008_EBX);
> +		cpuid_entry_override(entry, CPUID_8000_0008_EBX);
>  		/*
>  		 * AMD has separate bits for each SPEC_CTRL bit.
>  		 * arch/x86/kernel/cpu/bugs.c is kind enough to
> @@ -770,7 +770,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
>  		entry->eax = min(entry->eax, 0xC0000004);
>  		break;
>  	case 0xC0000001:
> -		cpuid_entry_mask(entry, CPUID_C000_0001_EDX);
> +		cpuid_entry_override(entry, CPUID_C000_0001_EDX);
>  		break;
>  	case 3: /* Processor serial number */
>  	case 5: /* MONITOR/MWAIT */

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

Patch

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 4416f2422321..871c0bd04e19 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -261,13 +261,13 @@  int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
 	return r;
 }
 
-static __always_inline void cpuid_entry_mask(struct kvm_cpuid_entry2 *entry,
-					     enum cpuid_leafs leaf)
+static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry,
+						 enum cpuid_leafs leaf)
 {
 	u32 *reg = cpuid_entry_get_reg(entry, leaf * 32);
 
 	BUILD_BUG_ON(leaf > ARRAY_SIZE(kvm_cpu_caps));
-	*reg &= kvm_cpu_caps[leaf];
+	*reg = kvm_cpu_caps[leaf];
 }
 
 static __always_inline void kvm_cpu_cap_mask(enum cpuid_leafs leaf, u32 mask)
@@ -488,8 +488,8 @@  static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
 		entry->eax = min(entry->eax, 0x1fU);
 		break;
 	case 1:
-		cpuid_entry_mask(entry, CPUID_1_EDX);
-		cpuid_entry_mask(entry, CPUID_1_ECX);
+		cpuid_entry_override(entry, CPUID_1_EDX);
+		cpuid_entry_override(entry, CPUID_1_ECX);
 		/* we support x2apic emulation even if host does not support
 		 * it since we emulate x2apic in software */
 		cpuid_entry_set(entry, X86_FEATURE_X2APIC);
@@ -543,9 +543,9 @@  static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
 	/* function 7 has additional index. */
 	case 7:
 		entry->eax = min(entry->eax, 1u);
-		cpuid_entry_mask(entry, CPUID_7_0_EBX);
-		cpuid_entry_mask(entry, CPUID_7_ECX);
-		cpuid_entry_mask(entry, CPUID_7_EDX);
+		cpuid_entry_override(entry, CPUID_7_0_EBX);
+		cpuid_entry_override(entry, CPUID_7_ECX);
+		cpuid_entry_override(entry, CPUID_7_EDX);
 
 		/* TSC_ADJUST and ARCH_CAPABILITIES are emulated in software. */
 		cpuid_entry_set(entry, X86_FEATURE_TSC_ADJUST);
@@ -564,7 +564,7 @@  static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
 			if (!entry)
 				goto out;
 
-			cpuid_entry_mask(entry, CPUID_7_1_EAX);
+			cpuid_entry_override(entry, CPUID_7_1_EAX);
 			entry->ebx = 0;
 			entry->ecx = 0;
 			entry->edx = 0;
@@ -630,7 +630,7 @@  static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
 		if (!entry)
 			goto out;
 
-		cpuid_entry_mask(entry, CPUID_D_1_EAX);
+		cpuid_entry_override(entry, CPUID_D_1_EAX);
 		if (entry->eax & (F(XSAVES)|F(XSAVEC)))
 			entry->ebx = xstate_required_size(supported_xcr0, true);
 		else
@@ -709,8 +709,8 @@  static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
 		entry->eax = min(entry->eax, 0x8000001f);
 		break;
 	case 0x80000001:
-		cpuid_entry_mask(entry, CPUID_8000_0001_EDX);
-		cpuid_entry_mask(entry, CPUID_8000_0001_ECX);
+		cpuid_entry_override(entry, CPUID_8000_0001_EDX);
+		cpuid_entry_override(entry, CPUID_8000_0001_ECX);
 		break;
 	case 0x80000007: /* Advanced power management */
 		/* invariant TSC is CPUID.80000007H:EDX[8] */
@@ -728,7 +728,7 @@  static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
 			g_phys_as = phys_as;
 		entry->eax = g_phys_as | (virt_as << 8);
 		entry->edx = 0;
-		cpuid_entry_mask(entry, CPUID_8000_0008_EBX);
+		cpuid_entry_override(entry, CPUID_8000_0008_EBX);
 		/*
 		 * AMD has separate bits for each SPEC_CTRL bit.
 		 * arch/x86/kernel/cpu/bugs.c is kind enough to
@@ -770,7 +770,7 @@  static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
 		entry->eax = min(entry->eax, 0xC0000004);
 		break;
 	case 0xC0000001:
-		cpuid_entry_mask(entry, CPUID_C000_0001_EDX);
+		cpuid_entry_override(entry, CPUID_C000_0001_EDX);
 		break;
 	case 3: /* Processor serial number */
 	case 5: /* MONITOR/MWAIT */