From patchwork Fri Jul 20 16:35:39 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Wanpeng Li X-Patchwork-Id: 10537983 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 97B2D6053F for ; Fri, 20 Jul 2018 16:35:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8E9D62988E for ; Fri, 20 Jul 2018 16:35:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8084B29548; Fri, 20 Jul 2018 16:35:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, FREEMAIL_FROM, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 31A2029548 for ; Fri, 20 Jul 2018 16:35:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387954AbeGTRYs (ORCPT ); Fri, 20 Jul 2018 13:24:48 -0400 Received: from mail-pl0-f65.google.com ([209.85.160.65]:35129 "EHLO mail-pl0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731305AbeGTRYs (ORCPT ); Fri, 20 Jul 2018 13:24:48 -0400 Received: by mail-pl0-f65.google.com with SMTP id w3-v6so5415747plq.2; Fri, 20 Jul 2018 09:35:45 -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:mime-version :content-transfer-encoding; bh=HVOb+vFJlwfEy9YaU1RuD0B68qKfBVjS/jc+VgEZqW0=; b=IVYGzr1PM5y15J1KmhJAms/qMWxuTvoAstTZcDuwfLhhuCzaH7Q0Kdsc5u6019s2MQ dx62gu33J0UxfVclczqiSvezRiBv06QIQgLicKpNTB9mpcb/ckyiJFxfneaZd3oYYCuE naxUOsefS9YviJ7W4Yp+TDF94frfCqt+F8yVucXao6HUwBZewItFNUvGKHS8JKDxVsZ6 7mDT5u9H1sIsyCbjHleP4SNZSV7NPBpAbTSHDDNJcdt7t/HtEuiYGtOgJS98+QstG0Qz YUH4T6L+RG3c/0T67qr3oJqHbddplsAtMsK6rJWjkhOL+pi1pFix9kmG3GrFuTbnvIQd Ya0g== 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:mime-version :content-transfer-encoding; bh=HVOb+vFJlwfEy9YaU1RuD0B68qKfBVjS/jc+VgEZqW0=; b=nDwsNFVSf3la2g0jWhZecQXA4AD+0usFytIii9ew+bPtpP8n9CP5jgaKngXOFMzBCV Ru5W1nkqYl7yMggZO9URlHXEdLAKQowhZU6rX7LuQpbgtnUYZfOyKPDvn05c61ImilGb uc2fYe1sdhFNHOjxBFwrV0cheqj3UfkRDVcgfxLQDHMtEG4cNn9Erx2xDoTHsM4ulKeE Gq2GOeaxDiYXmpXGuEwBd2AGOlACHYCeKxSddUwOJmhrzi2uEbp1L8wzEstlhjmTsIbo KFkUVYszqz1d5Yfiyv4bUvlE1Vq0/qJLWhpE6vnC/3OPWwYYCU/rkarsW8d5gyhg0V4K GMRg== X-Gm-Message-State: AOUpUlF32oMinOBeNApRknmGCW5peII8xZn2BQb0DK2CThHOhgWwguxR qCJ8drbQMWzofIUCrFp7wg1G9rQpt9I= X-Google-Smtp-Source: AAOMgpdLoqjPwxb9+ftdvpvh481Tp8lEpUatiQKUgoVJO+xH+/lTOs0m6VHglgF3krU91DMAUHKWGA== X-Received: by 2002:a17:902:9b82:: with SMTP id y2-v6mr2768795plp.69.1532104544616; Fri, 20 Jul 2018 09:35:44 -0700 (PDT) Received: from localhost ([223.72.65.191]) by smtp.gmail.com with ESMTPSA id a77-v6sm8642687pfj.38.2018.07.20.09.35.43 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 20 Jul 2018 09:35:44 -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?= , Wanpeng Li , Vitaly Kuznetsov Subject: [PATCH v4 6/6] KVM: X86: Expose PV_SEND_IPI CPUID feature bit to guest Date: Sat, 21 Jul 2018 00:35:39 +0800 Message-Id: <1532104539-16075-1-git-send-email-wanpengli@tencent.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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);