From: Wanpeng Li <kernellwp@gmail.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Nadav Amit <namit@vmware.com>
Subject: [PATCH] KVM: X86: Fix missing local pCPU when executing wbinvd on all dirty pCPUs
Date: Fri, 12 Mar 2021 10:45:51 +0800 [thread overview]
Message-ID: <1615517151-7465-1-git-send-email-wanpengli@tencent.com> (raw)
From: Wanpeng Li <wanpengli@tencent.com>
We should execute wbinvd on all dirty pCPUs when guest wbinvd exits
to maintain datat consistency in order to deal with noncoherent DMA.
smp_call_function_many() does not execute the provided function on
the local core, this patch replaces it by on_each_cpu_mask().
Reported-by: Nadav Amit <namit@vmware.com>
Cc: Nadav Amit <namit@vmware.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
---
arch/x86/kvm/x86.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 012d5df..aa6d667 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6638,7 +6638,7 @@ static int kvm_emulate_wbinvd_noskip(struct kvm_vcpu *vcpu)
int cpu = get_cpu();
cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
- smp_call_function_many(vcpu->arch.wbinvd_dirty_mask,
+ on_each_cpu_mask(vcpu->arch.wbinvd_dirty_mask,
wbinvd_ipi, NULL, 1);
put_cpu();
cpumask_clear(vcpu->arch.wbinvd_dirty_mask);
--
2.7.4
next reply other threads:[~2021-03-12 2:46 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-12 2:45 Wanpeng Li [this message]
2021-03-18 17:55 ` Paolo Bonzini
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