From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D22C3C48BD3 for ; Wed, 26 Jun 2019 17:41:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A256721743 for ; Wed, 26 Jun 2019 17:41:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726413AbfFZRld (ORCPT ); Wed, 26 Jun 2019 13:41:33 -0400 Received: from mail-wr1-f68.google.com ([209.85.221.68]:39200 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726179AbfFZRld (ORCPT ); Wed, 26 Jun 2019 13:41:33 -0400 Received: by mail-wr1-f68.google.com with SMTP id x4so3719362wrt.6 for ; Wed, 26 Jun 2019 10:41:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:in-reply-to:references:date :message-id:mime-version; bh=t2qwRs7koe0N7pYzHfarivbdbI697R0UkLvgOjEc6fg=; b=rNWScwCtIc3FS+PqLO6TGwiLFcIJtJxD+jaULsarqZ2w74dugcaLPDSdvP0+lTIGSU v33OiUzXZEsd7Wi7wY2sFZ53yOBP8sQLwJIgwPT+zjZ7+zHHQOgJzUBsi4Zov1dhpCjY r26KvGml+iAKaU3ZFtDya4VU+1P8nlBOR/UL383c5wAnm+1S+Po3A1OnTOJQulqRbgzh Z4HZhf9x8UAFJ9P2U1K5Sd0clH73ACAX0CV89X3ST6Wjo6NQolKtm6Qp4ADJ9L8too4k d2u41GcJ9V9RqpFJFFlkG+AO0PvdPJErgDhSwo55gzXuyvKHcMuII0tpdAkhwGFwut71 wT6w== X-Gm-Message-State: APjAAAU+MqkkgJ4CF90FYZrqRyZ8zCGtrNb/RXWR8yagCWa18FrCV1LX uE2NMWfJHkBn9mCZJyAhs+aRxFEiNuk= X-Google-Smtp-Source: APXvYqwJ4Z4pdKRax8Z2pKF/BL7aG7XRGilbIpnO+wMYHg1EmrVhaIhK8YsHNXK6Nvcm7thSb6IuMg== X-Received: by 2002:adf:ee91:: with SMTP id b17mr4595442wro.182.1561570891172; Wed, 26 Jun 2019 10:41:31 -0700 (PDT) Received: from vitty.brq.redhat.com (nat-pool-brq-t.redhat.com. [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