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[34.168.104.7]) by smtp.gmail.com with ESMTPSA id t13-20020a170902e1cd00b001754e086eb3sm6483576pla.302.2022.11.01.08.21.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Nov 2022 08:21:41 -0700 (PDT) Date: Tue, 1 Nov 2022 15:21:38 +0000 From: Sean Christopherson To: Vitaly Kuznetsov Cc: kvm@vger.kernel.org, Paolo Bonzini , Wanpeng Li , Jim Mattson , Michael Kelley , Siddharth Chandrasekaran , Yuan Yao , Maxim Levitsky , linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v13 44/48] KVM: selftests: Stuff RAX/RCX with 'safe' values in vmmcall()/vmcall() Message-ID: References: <20221101145426.251680-1-vkuznets@redhat.com> <20221101145426.251680-45-vkuznets@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221101145426.251680-45-vkuznets@redhat.com> X-Spam-Status: No, score=-17.6 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, ENV_AND_HDR_SPF_MATCH,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS, USER_IN_DEF_DKIM_WL,USER_IN_DEF_SPF_WL 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 Tue, Nov 01, 2022, Vitaly Kuznetsov wrote: > vmmcall()/vmcall() are used to exit from L2 to L1 and no concrete hypercall > ABI is currenty followed. With the introduction of Hyper-V L2 TLB flush > it becomes (theoretically) possible that L0 will take responsibility for > handling the call and no L1 exit will happen. Prevent this by stuffing RAX > (KVM ABI) and RCX (Hyper-V ABI) with 'safe' values. > > While on it, convert vmmcall() to 'static inline', make it setup stack > frame and move to include/x86_64/svm_util.h. > > Signed-off-by: Vitaly Kuznetsov > --- Reviewed-by: Sean Christopherson