[PATCH 18/26] KVM: x86: Handle INVPCID CPUID adjustment in vendor code

Sean Christopherson
2020-01-29T23:47:41Z

Move the INVPCID CPUID adjustments into vendor code to eliminate an
instance of the undesirable "unsigned f_* = *_supported ? F(*) : 0"
pattern in the common CPUID handling code. Drop ->invpcid_supported()
since CPUID adjustment was the only user.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/include/asm/kvm_host.h | 1 -
arch/x86/kvm/cpuid.c | 3 +--
arch/x86/kvm/svm.c | 7 +------
arch/x86/kvm/vmx/vmx.c | 10 +++-------
4 files changed, 5 insertions(+), 16 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 39ee83f42935..b9c871c03bf5 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1145,7 +1145,6 @@ struct kvm_x86_ops {
u64 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);
int (*get_lpage_level)(void);
bool (*rdtscp_supported)(void);
- bool (*invpcid_supported)(void);

void (*set_tdp_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index aa03dc665a44..07526b81658e 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -321,7 +321,6 @@ static int __do_cpuid_func_emulated(struct kvm_cpuid_entry2 *entry,

static inline void do_cpuid_7_mask(struct kvm_cpuid_entry2 *entry, int index)
{
- unsigned f_invpcid = kvm_x86_ops->invpcid_supported() ? F(INVPCID) : 0;
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;
@@ -330,7 +329,7 @@ static inline void do_cpuid_7_mask(struct kvm_cpuid_entry2 *entry, int index)
/* cpuid 7.0.ebx */
const u32 kvm_cpuid_7_0_ebx_x86_features =
F(FSGSBASE) | F(BMI1) | F(HLE) | F(AVX2) | F(SMEP) |
- F(BMI2) | F(ERMS) | f_invpcid | F(RTM) | F(MPX) | F(RDSEED) |
+ F(BMI2) | F(ERMS) | F(INVPCID) | F(RTM) | F(MPX) | F(RDSEED) |
F(ADX) | F(SMAP) | F(AVX512IFMA) | F(AVX512F) | F(AVX512PF) |
F(AVX512ER) | F(AVX512CD) | F(CLFLUSHOPT) | F(CLWB) | F(AVX512DQ) |
F(SHA_NI) | F(AVX512BW) | F(AVX512VL) | f_intel_pt;
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index f64c2c1f9d1f..4ea530ff6a0c 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -6061,6 +6061,7 @@ static void svm_set_supported_cpuid(struct kvm_cpuid_entry2 *entry)
break;
case 0x7:
cpuid_entry_clear(entry, X86_FEATURE_MPX);
+ cpuid_entry_clear(entry, X86_FEATURE_INVPCID);
break;
case 0x80000001:
if (nested)
@@ -6099,11 +6100,6 @@ static bool svm_rdtscp_supported(void)
return boot_cpu_has(X86_FEATURE_RDTSCP);
}

-static bool svm_invpcid_supported(void)
-{
- return false;
-}
-
static bool svm_xsaves_supported(void)
{
return boot_cpu_has(X86_FEATURE_XSAVES);
@@ -7485,7 +7481,6 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.cpuid_update = svm_cpuid_update,

.rdtscp_supported = svm_rdtscp_supported,
- .invpcid_supported = svm_invpcid_supported,
.xsaves_supported = svm_xsaves_supported,
.umip_emulated = svm_umip_emulated,
.pt_supported = svm_pt_supported,
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index f33bf519690e..14e5031772e5 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -1656,11 +1656,6 @@ static bool vmx_rdtscp_supported(void)
return cpu_has_vmx_rdtscp();
}

-static bool vmx_invpcid_supported(void)
-{
- return cpu_has_vmx_invpcid();
-}
-
/*
* Swap MSR entry in host/guest MSR entry array.
*/
@@ -4071,7 +4066,7 @@ static void vmx_compute_secondary_exec_control(struct vcpu_vmx *vmx)
}
}

- if (vmx_invpcid_supported()) {
+ if (cpu_has_vmx_invpcid()) {
/* Exposing INVPCID only when PCID is exposed */
bool invpcid_enabled =
guest_cpuid_has(vcpu, X86_FEATURE_INVPCID) &&
@@ -7144,6 +7139,8 @@ static void vmx_set_supported_cpuid(struct kvm_cpuid_entry2 *entry)
case 0x7:
if (!kvm_mpx_supported())
cpuid_entry_clear(entry, X86_FEATURE_MPX);
+ if (!cpu_has_vmx_invpcid())
+ cpuid_entry_clear(entry, X86_FEATURE_INVPCID);
break;
default:
break;
@@ -7885,7 +7882,6 @@ static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
.cpuid_update = vmx_cpuid_update,

.rdtscp_supported = vmx_rdtscp_supported,
- .invpcid_supported = vmx_invpcid_supported,

.set_supported_cpuid = vmx_set_supported_cpuid,

--
2.24.1