linux-kernel - Re: [PATCH 1/6] KVM: x86/mmu: release audited pfns

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Message-ID: <4816287a-b9a9-d3f4-f844-06922d696e06@redhat.com>
Date:   Thu, 24 Jun 2021 11:43:32 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Nicholas Piggin <npiggin@...il.com>,
        Aleksandar Markovic <aleksandar.qemu.devel@...il.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Paul Mackerras <paulus@...abs.org>,
        David Stevens <stevensd@...omium.org>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>
Cc:     Alexandru Elisei <alexandru.elisei@....com>,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        intel-gvt-dev@...ts.freedesktop.org,
        James Morse <james.morse@....com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvmarm@...ts.cs.columbia.edu,
        kvm-ppc@...r.kernel.org, kvm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Sean Christopherson <seanjc@...gle.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Will Deacon <will@...nel.org>
Subject: Re: [PATCH 1/6] KVM: x86/mmu: release audited pfns

On 24/06/21 10:43, Nicholas Piggin wrote:
> Excerpts from David Stevens's message of June 24, 2021 1:57 pm:
>> From: David Stevens <stevensd@...omium.org>
> 
> Changelog? This looks like a bug, should it have a Fixes: tag?

Probably has been there forever... The best way to fix the bug would be 
to nuke mmu_audit.c, which I've threatened to do many times but never 
followed up on.

Paolo

> Thanks,
> Nick
> 
>>
>> Signed-off-by: David Stevens <stevensd@...omium.org>
>> ---
>>   arch/x86/kvm/mmu/mmu_audit.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/arch/x86/kvm/mmu/mmu_audit.c b/arch/x86/kvm/mmu/mmu_audit.c
>> index cedc17b2f60e..97ff184084b4 100644
>> --- a/arch/x86/kvm/mmu/mmu_audit.c
>> +++ b/arch/x86/kvm/mmu/mmu_audit.c
>> @@ -121,6 +121,8 @@ static void audit_mappings(struct kvm_vcpu *vcpu, u64 *sptep, int level)
>>   		audit_printk(vcpu->kvm, "levels %d pfn %llx hpa %llx "
>>   			     "ent %llxn", vcpu->arch.mmu->root_level, pfn,
>>   			     hpa, *sptep);
>> +
>> +	kvm_release_pfn_clean(pfn);
>>   }
>>   
>>   static void inspect_spte_has_rmap(struct kvm *kvm, u64 *sptep)
>> -- 
>> 2.32.0.93.g670b81a890-goog
>>
>>
>