linux-kernel - Re: [PATCH] KVM: x86: fix access memslots w/o hold srcu read lock

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Date:	Sun, 02 Nov 2014 07:50:29 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	kvm@...r.kernel.org
Subject: Re: [PATCH] KVM: x86: fix access memslots w/o hold srcu read lock



On 01/11/2014 03:49, Wanpeng Li wrote:
> 
> This is also not enough. I see the warning in the below path during the
> test:
> 
> kvm_arch_vcpu_ioctl_run
> -> kvm_apic_accept_events
> -> kvm_vcpu_reset

Hmm, better bypass the problem altogether:

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index a0f78dbaabee..3e556c68351b 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -4579,7 +4579,7 @@ static void vmx_vcpu_reset(struct kvm_vcpu *vcpu)
 		vmcs_write32(TPR_THRESHOLD, 0);
 	}
 
-	kvm_vcpu_reload_apic_access_page(vcpu);
+	kvm_make_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu);
 
 	if (vmx_vm_has_apicv(vcpu->kvm))
 		memset(&vmx->pi_desc, 0, sizeof(struct pi_desc));

(untested)

Paolo

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