linux-kernel - [PATCH v2 2/3] KVM: VMX: Fold loaded_vmcs_init() into alloc_loaded

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Date:   Sat, 21 Mar 2020 12:37:50 -0700
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
Subject: [PATCH v2 2/3] KVM: VMX: Fold loaded_vmcs_init() into alloc_loaded_vmcs()

Subsume loaded_vmcs_init() into alloc_loaded_vmcs(), its only remaining
caller, and drop the VMCLEAR on the shadow VMCS, which is guaranteed to
be NULL.  loaded_vmcs_init() was previously used by loaded_vmcs_clear(),
but loaded_vmcs_clear() also subsumed loaded_vmcs_init() to properly
handle smp_wmb() with respect to VMCLEAR.

Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
 arch/x86/kvm/vmx/vmx.c | 14 ++++----------
 arch/x86/kvm/vmx/vmx.h |  1 -
 2 files changed, 4 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index efaca09455bf..07634caa560d 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -653,15 +653,6 @@ static int vmx_set_guest_msr(struct vcpu_vmx *vmx, struct shared_msr_entry *msr,
 	return ret;
 }
 
-void loaded_vmcs_init(struct loaded_vmcs *loaded_vmcs)
-{
-	vmcs_clear(loaded_vmcs->vmcs);
-	if (loaded_vmcs->shadow_vmcs && loaded_vmcs->launched)
-		vmcs_clear(loaded_vmcs->shadow_vmcs);
-	loaded_vmcs->cpu = -1;
-	loaded_vmcs->launched = 0;
-}
-
 #ifdef CONFIG_KEXEC_CORE
 static void crash_vmclear_local_loaded_vmcss(void)
 {
@@ -2555,9 +2546,12 @@ int alloc_loaded_vmcs(struct loaded_vmcs *loaded_vmcs)
 	if (!loaded_vmcs->vmcs)
 		return -ENOMEM;
 
+	vmcs_clear(loaded_vmcs->vmcs);
+
 	loaded_vmcs->shadow_vmcs = NULL;
 	loaded_vmcs->hv_timer_soft_disabled = false;
-	loaded_vmcs_init(loaded_vmcs);
+	loaded_vmcs->cpu = -1;
+	loaded_vmcs->launched = 0;
 
 	if (cpu_has_vmx_msr_bitmap()) {
 		loaded_vmcs->msr_bitmap = (unsigned long *)
diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
index be93d597306c..79d38f41ef7a 100644
--- a/arch/x86/kvm/vmx/vmx.h
+++ b/arch/x86/kvm/vmx/vmx.h
@@ -492,7 +492,6 @@ struct vmcs *alloc_vmcs_cpu(bool shadow, int cpu, gfp_t flags);
 void free_vmcs(struct vmcs *vmcs);
 int alloc_loaded_vmcs(struct loaded_vmcs *loaded_vmcs);
 void free_loaded_vmcs(struct loaded_vmcs *loaded_vmcs);
-void loaded_vmcs_init(struct loaded_vmcs *loaded_vmcs);
 void loaded_vmcs_clear(struct loaded_vmcs *loaded_vmcs);
 
 static inline struct vmcs *alloc_vmcs(bool shadow)
-- 
2.24.1