linux-kernel - [PATCH 3.16 68/99] KVM: x86: Free wbinvd_dirty

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Message-ID: <lsq.1589984009.369987605@decadent.org.uk>
Date:   Wed, 20 May 2020 15:14:36 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Paolo Bonzini" <pbonzini@...hat.com>,
        "Sean Christopherson" <sean.j.christopherson@...el.com>
Subject: [PATCH 3.16 68/99] KVM: x86: Free wbinvd_dirty_mask if vCPU
 creation fails

3.16.84-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Sean Christopherson <sean.j.christopherson@...el.com>

commit 16be9ddea268ad841457a59109963fff8c9de38d upstream.

Free the vCPU's wbinvd_dirty_mask if vCPU creation fails after
kvm_arch_vcpu_init(), e.g. when installing the vCPU's file descriptor.
Do the freeing by calling kvm_arch_vcpu_free() instead of open coding
the freeing.  This adds a likely superfluous, but ultimately harmless,
call to kvmclock_reset(), which only clears vcpu->arch.pv_time_enabled.
Using kvm_arch_vcpu_free() allows for additional cleanup in the future.

Fixes: f5f48ee15c2ee ("KVM: VMX: Execute WBINVD to keep data consistency with assigned devices")
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
[bwh: Backported to 3.16: Also delete the preceding fx_free(), since
 kvm_arch_vcpu_free() calls it.]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7087,8 +7087,7 @@ void kvm_arch_vcpu_destroy(struct kvm_vc
 	kvm_mmu_unload(vcpu);
 	vcpu_put(vcpu);
 
-	fx_free(vcpu);
-	kvm_x86_ops->vcpu_free(vcpu);
+	kvm_arch_vcpu_free(vcpu);
 }
 
 void kvm_vcpu_reset(struct kvm_vcpu *vcpu)