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[35.185.214.157]) by smtp.gmail.com with ESMTPSA id e18-20020a170902f11200b00162017529easm5297369plb.167.2022.05.23.09.17.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 May 2022 09:17:37 -0700 (PDT) Date: Mon, 23 May 2022 16:17:34 +0000 From: Sean Christopherson To: shaoqin.huang@intel.com Cc: pbonzini@redhat.com, Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] KVM: x86/mmu: Check every prev_roots in __kvm_mmu_free_obsolete_roots() Message-ID: References: <20220523010948.2018342-1-shaoqin.huang@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20220523010948.2018342-1-shaoqin.huang@intel.com> X-Spam-Status: No, score=-9.5 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RDNS_NONE,SPF_HELO_NONE,T_SCC_BODY_TEXT_LINE, USER_IN_DEF_DKIM_WL autolearn=no 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 Sun, May 22, 2022, shaoqin.huang@intel.com wrote: > From: Shaoqin Huang > > Iterate every prev_roots and only zap obsoleted roots. Better would be something like: When freeing obsolete previous roots, check prev_roots as intended, not the current root. Ugh, my bad. This escaped into v5.18 :-( Fixes: 527d5cd7eece ("KVM: x86/mmu: Zap only obsolete roots if a root shadow page is zapped") Cc: stable@vger.kernel.org > > Signed-off-by: Shaoqin Huang > --- > 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 45e1573f8f1d..22803916a609 100644 > --- a/arch/x86/kvm/mmu/mmu.c > +++ b/arch/x86/kvm/mmu/mmu.c > @@ -5168,7 +5168,7 @@ 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.hpa)) My version is bad, but at least it compiles ;-) arch/x86/kvm/mmu/mmu.c: In function ‘__kvm_mmu_free_obsolete_roots’: arch/x86/kvm/mmu/mmu.c:5182:58: error: ‘(struct kvm_mmu_root_info *)&mmu->prev_roots’ is a pointer; did you mean to use ‘->’? 5182 | if (is_obsolete_root(kvm, mmu->prev_roots.hpa)) | ^ | -> if (is_obsolete_root(kvm, mmu->prev_roots[i].hpa)) > roots_to_free |= KVM_MMU_ROOT_PREVIOUS(i); > } > > -- > 2.30.2 >