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=-2.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_GIT 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 456D9C6778A for ; Tue, 3 Jul 2018 06:21:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0295E24B6A for ; Tue, 3 Jul 2018 06:21:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="PKWRrL0D" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0295E24B6A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933398AbeGCGVw (ORCPT ); Tue, 3 Jul 2018 02:21:52 -0400 Received: from mail-pf0-f194.google.com ([209.85.192.194]:42633 "EHLO mail-pf0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932767AbeGCGVs (ORCPT ); Tue, 3 Jul 2018 02:21:48 -0400 Received: by mail-pf0-f194.google.com with SMTP id v9-v6so486403pff.9; Mon, 02 Jul 2018 23:21:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=HVOb+vFJlwfEy9YaU1RuD0B68qKfBVjS/jc+VgEZqW0=; b=PKWRrL0DcBRZZKToQLn/A/ZchISxXwjMT/yB8kjCrUthzbBI9tcmDhtJ+lanz/ntZs uXAnqvJ5sxXlOITSrrIFQpUxRb4xTRmuuVVXGAGaw1dvtag5Bq1M+mXdFJCHAiQmPek2 IVWMIoFkvliQo8y09TpY0cYbpiXl4SlJofWGwQ7JUa1YPJe5gymhctt/mnAj9XCs7tHH G4XoRBkQh9Rk+PA807TouGwbFaNCb+I4bNOiHE9rxmoEeTEXQbQWjoWm8wn/APLE+vcS HXRIoshmaoSxwoRzk0rw4ciwJFFHzZlCDSmzX4w2+SNKiJRmjacPMS5ske5UFeHHjrXx wgaw== 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:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=HVOb+vFJlwfEy9YaU1RuD0B68qKfBVjS/jc+VgEZqW0=; b=cQkAGFJpsKiokVwxRPXNn3H0LFrIyo/DFnDK35n62UO91j6FSYjZbfr/9FXJYbHQkD WtIo+1yd8+GLgMjOpZmVzTNYm/uhDX4ydz9fzUIiOyhvSqPH7T7ICg8ZguuCOiYwUrwk q8o4jr1QnumOIupnlRYLRcYJ8objR+t+obQ3MmPcxV8W1x8z3a5C+M1MAONVEnZVCJ6B 5UKlhkrHmRojAiU3rMUtenrmNafb1RzY/Cn56njHxtKbXFVxtySjcArk9Bk7SA2N+It+ Bw+qi8M1b2KKyVRug9wPkP0O0irrIiCrfjstuOSPNwgS90HzvgZfTXn8PSSmxa9cw1Ll 0y5w== X-Gm-Message-State: APt69E3+IIxKrIsW+P/AdUgcQi/ZAz6cnve+0HEeE5+Gg8Z7DdtXXcQC 4yP34DMoAGd8SGp/BMEVZ+VitA== X-Google-Smtp-Source: ADUXVKK/54PEcLPPOV+v/97C8p+y7iViarfH1/j1okrhiZLSEsDSfwHpGUaup0N7rxRpP7ZEmOJxOQ== X-Received: by 2002:a63:8c5:: with SMTP id 188-v6mr23989672pgi.97.1530598907850; Mon, 02 Jul 2018 23:21:47 -0700 (PDT) Received: from localhost.localdomain ([203.205.141.123]) by smtp.googlemail.com with ESMTPSA id v89-v6sm1766427pfd.64.2018.07.02.23.21.46 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 02 Jul 2018 23:21:47 -0700 (PDT) From: Wanpeng Li X-Google-Original-From: Wanpeng Li To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Vitaly Kuznetsov Subject: [PATCH v3 6/6] KVM: X86: Expose PV_SEND_IPI CPUID feature bit to guest Date: Tue, 3 Jul 2018 14:21:31 +0800 Message-Id: <1530598891-21370-7-git-send-email-wanpengli@tencent.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1530598891-21370-1-git-send-email-wanpengli@tencent.com> References: <1530598891-21370-1-git-send-email-wanpengli@tencent.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Wanpeng Li Expose PV_SEND_IPI feature bit to guest, the guest can check this feature bit before using paravirtualized send IPIs. Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Vitaly Kuznetsov Signed-off-by: Wanpeng Li --- Documentation/virtual/kvm/cpuid.txt | 4 ++++ arch/x86/kvm/cpuid.c | 3 ++- 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/Documentation/virtual/kvm/cpuid.txt b/Documentation/virtual/kvm/cpuid.txt index ab022dc..97ca194 100644 --- a/Documentation/virtual/kvm/cpuid.txt +++ b/Documentation/virtual/kvm/cpuid.txt @@ -62,6 +62,10 @@ KVM_FEATURE_ASYNC_PF_VMEXIT || 10 || paravirtualized async PF VM exit || || can be enabled by setting bit 2 || || when writing to msr 0x4b564d02 ------------------------------------------------------------------------------ +KVM_FEATURE_PV_SEND_IPI || 11 || guest checks this feature bit + || || before using paravirtualized + || || send IPIs. +------------------------------------------------------------------------------ KVM_FEATURE_CLOCKSOURCE_STABLE_BIT || 24 || host will warn if no guest-side || || per-cpu warps are expected in || || kvmclock. diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 7e042e3..7bcfa61 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -621,7 +621,8 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT) | (1 << KVM_FEATURE_PV_UNHALT) | (1 << KVM_FEATURE_PV_TLB_FLUSH) | - (1 << KVM_FEATURE_ASYNC_PF_VMEXIT); + (1 << KVM_FEATURE_ASYNC_PF_VMEXIT) | + (1 << KVM_FEATURE_PV_SEND_IPI); if (sched_info_on()) entry->eax |= (1 << KVM_FEATURE_STEAL_TIME); -- 2.7.4