[PATCH v2 29/66] KVM: x86: Refactor cpuid_mask() to auto-retrieve the register

Sean Christopherson
2020-03-02T23:58:55Z

Use the recently introduced cpuid_entry_get_reg() to automatically get
the appropriate register when masking a CPUID entry.

No functional change intended.

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/kvm/cpuid.c | 28 +++++++++++++++-------------
1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 14b5fb24c6be..04343c54a419 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -254,10 +254,12 @@ int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
return r;
}

-static __always_inline void cpuid_mask(u32 *word, int wordnum)
+static __always_inline void cpuid_entry_mask(struct kvm_cpuid_entry2 *entry,
+ enum cpuid_leafs leaf)
{
- reverse_cpuid_check(wordnum);
- *word &= boot_cpu_data.x86_capability[wordnum];
+ u32 *reg = cpuid_entry_get_reg(entry, leaf * 32);
+
+ *reg &= boot_cpu_data.x86_capability[leaf];
}

struct kvm_cpuid_array {
@@ -373,13 +375,13 @@ static inline void do_cpuid_7_mask(struct kvm_cpuid_entry2 *entry)
case 0:
entry->eax = min(entry->eax, 1u);
entry->ebx &= kvm_cpuid_7_0_ebx_x86_features;
- cpuid_mask(&entry->ebx, CPUID_7_0_EBX);
+ cpuid_entry_mask(entry, CPUID_7_0_EBX);
/* TSC_ADJUST is emulated */
cpuid_entry_set(entry, X86_FEATURE_TSC_ADJUST);

entry->ecx &= kvm_cpuid_7_0_ecx_x86_features;
f_la57 = cpuid_entry_get(entry, X86_FEATURE_LA57);
- cpuid_mask(&entry->ecx, CPUID_7_ECX);
+ cpuid_entry_mask(entry, CPUID_7_ECX);
/* Set LA57 based on hardware capability. */
entry->ecx |= f_la57;
entry->ecx |= f_umip;
@@ -389,7 +391,7 @@ static inline void do_cpuid_7_mask(struct kvm_cpuid_entry2 *entry)
cpuid_entry_clear(entry, X86_FEATURE_PKU);

entry->edx &= kvm_cpuid_7_0_edx_x86_features;
- cpuid_mask(&entry->edx, CPUID_7_EDX);
+ cpuid_entry_mask(entry, CPUID_7_EDX);
if (boot_cpu_has(X86_FEATURE_IBPB) && boot_cpu_has(X86_FEATURE_IBRS))
cpuid_entry_set(entry, X86_FEATURE_SPEC_CTRL);
if (boot_cpu_has(X86_FEATURE_STIBP))
@@ -507,9 +509,9 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
break;
case 1:
entry->edx &= kvm_cpuid_1_edx_x86_features;
- cpuid_mask(&entry->edx, CPUID_1_EDX);
+ cpuid_entry_mask(entry, CPUID_1_EDX);
entry->ecx &= kvm_cpuid_1_ecx_x86_features;
- cpuid_mask(&entry->ecx, CPUID_1_ECX);
+ cpuid_entry_mask(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);
@@ -619,7 +621,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
goto out;

entry->eax &= kvm_cpuid_D_1_eax_x86_features;
- cpuid_mask(&entry->eax, CPUID_D_1_EAX);
+ cpuid_entry_mask(entry, CPUID_D_1_EAX);
if (entry->eax & (F(XSAVES)|F(XSAVEC)))
entry->ebx = xstate_required_size(supported_xcr0, true);
else
@@ -699,9 +701,9 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
break;
case 0x80000001:
entry->edx &= kvm_cpuid_8000_0001_edx_x86_features;
- cpuid_mask(&entry->edx, CPUID_8000_0001_EDX);
+ cpuid_entry_mask(entry, CPUID_8000_0001_EDX);
entry->ecx &= kvm_cpuid_8000_0001_ecx_x86_features;
- cpuid_mask(&entry->ecx, CPUID_8000_0001_ECX);
+ cpuid_entry_mask(entry, CPUID_8000_0001_ECX);
break;
case 0x80000007: /* Advanced power management */
/* invariant TSC is CPUID.80000007H:EDX[8] */
@@ -720,7 +722,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
entry->eax = g_phys_as | (virt_as << 8);
entry->edx = 0;
entry->ebx &= kvm_cpuid_8000_0008_ebx_x86_features;
- cpuid_mask(&entry->ebx, CPUID_8000_0008_EBX);
+ cpuid_entry_mask(entry, CPUID_8000_0008_EBX);
/*
* AMD has separate bits for each SPEC_CTRL bit.
* arch/x86/kernel/cpu/bugs.c is kind enough to
@@ -763,7 +765,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
break;
case 0xC0000001:
entry->edx &= kvm_cpuid_C000_0001_edx_x86_features;
- cpuid_mask(&entry->edx, CPUID_C000_0001_EDX);
+ cpuid_entry_mask(entry, CPUID_C000_0001_EDX);
break;
case 3: /* Processor serial number */
case 5: /* MONITOR/MWAIT */
--
2.24.1