linux-kernel - [PATCH v2 31/66] KVM: x86: Handle INVPCID CPUID adjustment in VMX code

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Date:   Mon,  2 Mar 2020 15:56:34 -0800
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Xiaoyao Li <xiaoyao.li@...el.com>
Subject: [PATCH v2 31/66] KVM: x86: Handle INVPCID CPUID adjustment in VMX code

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

No functional change intended.

Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
 arch/x86/include/asm/kvm_host.h |  1 -
 arch/x86/kvm/cpuid.c            |  3 +--
 arch/x86/kvm/svm.c              |  6 ------
 arch/x86/kvm/vmx/vmx.c          | 10 +++-------
 4 files changed, 4 insertions(+), 16 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index b0bd6bd3838a..96ea76e0a69f 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1150,7 +1150,6 @@ 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 43f76b36f461..983eec22d2f5 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_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;
@@ -348,7 +347,7 @@ static inline void do_cpuid_7_mask(struct kvm_cpuid_entry2 *entry)
 	/* 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) | 0 /*MPX*/ | F(RDSEED) |
+		F(BMI2) | F(ERMS) | 0 /*INVPCID*/ | F(RTM) | 0 /*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 728b90c1a68b..c0e0dd7acb1f 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -6071,11 +6071,6 @@ 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);
@@ -7456,7 +7451,6 @@ 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 ef3a63ce8a6a..67958c27b7c0 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -1692,11 +1692,6 @@ 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.
  */
@@ -4094,7 +4089,7 @@ 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) &&
@@ -7134,6 +7129,8 @@ static void vmx_set_supported_cpuid(struct kvm_cpuid_entry2 *entry)
 	case 0x7:
 		if (boot_cpu_has(X86_FEATURE_MPX) && kvm_mpx_supported())
 			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);
 		break;
 	default:
 		break;
@@ -7919,7 +7916,6 @@ 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