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[213.175.37.10]) by smtp.gmail.com with ESMTPSA id 72sm24638446wrk.22.2019.06.26.10.41.30 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Wed, 26 Jun 2019 10:41:30 -0700 (PDT) From: Vitaly Kuznetsov To: Andy Lutomirski , Nadav Amit Cc: Dave Hansen , Peter Zijlstra , LKML , Ingo Molnar , Borislav Petkov , the arch/x86 maintainers , Thomas Gleixner , Dave Hansen , Paolo Bonzini , "kvm\@vger.kernel.org" Subject: Re: [PATCH 6/9] KVM: x86: Provide paravirtualized flush_tlb_multi() In-Reply-To: References: <20190613064813.8102-1-namit@vmware.com> <20190613064813.8102-7-namit@vmware.com> <401C4384-98A1-4C27-8F71-4848F4B4A440@vmware.com> <35755C67-E8EB-48C3-8343-BB9ABEB4E32C@vmware.com> Date: Wed, 26 Jun 2019 19:41:29 +0200 Message-ID: <878stockhi.fsf@vitty.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Andy Lutomirski writes: > All this being said, do we currently have any system that supports > PCID *and* remote flushes? I guess KVM has some mechanism, but I'm > not that familiar with its exact capabilities. If I remember right, > Hyper-V doesn't expose PCID yet. > It already does (and support it to certain extent), see commit 617ab45c9a8900e64a78b43696c02598b8cad68b Author: Vitaly Kuznetsov Date: Wed Jan 24 11:36:29 2018 +0100 x86/hyperv: Stop suppressing X86_FEATURE_PCID -- Vitaly