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Bae" , Thomas Gleixner , Sasha Levin , Borislav Petkov , Peter Zijlstra , Ingo Molnar References: <39d57e4d-5db4-f536-6f5e-6b0414c0dccc@amd.com> <7dedb0ab-56a6-5d96-577b-21ab1ecdad24@amd.com> From: Paolo Bonzini Message-ID: Date: Thu, 20 Aug 2020 15:43:16 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 19/08/20 23:25, Andy Lutomirski wrote: > wrmsrl(MSR_KERNEL_GS_BASE, current->thread.gsbase); > load_gs_index(svm->host.gs); > > Surely that should do load_gs_index() *before* wrmsrl(). But that's > not the problem at hand. The wrmsrl is writing the inactive GS base so the ordering between load_gs_index and wrmsrl(MSR_KERNEL_GS_BASE) should be irrelevant? Paolo