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([2001:b07:6468:f312:9af8:e5f5:7516:fa89]) by smtp.googlemail.com with ESMTPSA id u10-20020adfdd4a000000b002102cc4d63asm21428082wrm.81.2022.06.07.08.14.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 Jun 2022 08:14:49 -0700 (PDT) Message-ID: <97789f9e-a33e-bb8d-d5b1-9be31232b64a@redhat.com> Date: Tue, 7 Jun 2022 17:14:47 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.8.0 Subject: Re: [PATCH v2] KVM: x86/mmu: Check every prev_roots in __kvm_mmu_free_obsolete_roots() Content-Language: en-US To: shaoqin.huang@intel.com Cc: Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Ben Gardon , kvm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20220607005905.2933378-1-shaoqin.huang@intel.com> From: Paolo Bonzini In-Reply-To: <20220607005905.2933378-1-shaoqin.huang@intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-4.3 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,RDNS_NONE,SPF_HELO_NONE, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 6/7/22 02:59, shaoqin.huang@intel.com wrote: > From: Shaoqin Huang > > When freeing obsolete previous roots, check prev_roots as intended, not > the current root. > > Signed-off-by: Shaoqin Huang > Fixes: 527d5cd7eece ("KVM: x86/mmu: Zap only obsolete roots if a root shadow page is zapped") > --- > Changes in v2: > - Make the commit message more clearer. > - Fixed the missing idx. > > arch/x86/kvm/mmu/mmu.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c > index f4653688fa6d..e826ee9138fa 100644 > --- a/arch/x86/kvm/mmu/mmu.c > +++ b/arch/x86/kvm/mmu/mmu.c > @@ -5179,7 +5179,7 @@ static void __kvm_mmu_free_obsolete_roots(struct kvm *kvm, struct kvm_mmu *mmu) > roots_to_free |= KVM_MMU_ROOT_CURRENT; > > for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++) { > - if (is_obsolete_root(kvm, mmu->root.hpa)) > + if (is_obsolete_root(kvm, mmu->prev_roots[i].hpa)) > roots_to_free |= KVM_MMU_ROOT_PREVIOUS(i); > } > Queued, thanks. Paolo