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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4AACDC2BA4C for ; Wed, 26 Jan 2022 17:23:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243718AbiAZRWn (ORCPT ); Wed, 26 Jan 2022 12:22:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43318 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243647AbiAZRWe (ORCPT ); Wed, 26 Jan 2022 12:22:34 -0500 Received: from mail-pl1-x649.google.com (mail-pl1-x649.google.com [IPv6:2607:f8b0:4864:20::649]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 96F68C061749 for ; Wed, 26 Jan 2022 09:22:34 -0800 (PST) Received: by mail-pl1-x649.google.com with SMTP id e3-20020a170902ed8300b0014b46561c92so66214plj.15 for ; Wed, 26 Jan 2022 09:22:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=reply-to:date:in-reply-to:message-id:mime-version:references :subject:from:to:cc; bh=ff0gIIVT5mkOusZfHSkDsjrfQJ504HRuYB+DqdCYRzo=; b=sTzD25hboOP7p75R02/TLTWw//Il8gFhJL7Vz+HbfZ87lxCmYMp5oWAU6axG+RVQ87 /CN2IwWa3VZk5ZmAvYeQjN+DmbdtnvL3gfxHeRuC+xKv4sZHQeyerJZLW2ixNDdsORPf bMTiRLh2vPc0I3b64auOVBcwuVbX8BkpMMDfa3hA/IkVPPgt9RhHsXuRN7yx3ZyrHuxf CM3pngA/s3TeL/XmM+EItNhSUW0hA0xfcuiglqxqyenTXNtuxCqo4Sy8ym9s2Gw76isb 6n8uR62WCmVky2WU/cShi8umiIBPimr9+6k1+Dz4qbidJV3jD+ug2VtH9SpRzrbd+vZe Dktw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:reply-to:date:in-reply-to:message-id :mime-version:references:subject:from:to:cc; bh=ff0gIIVT5mkOusZfHSkDsjrfQJ504HRuYB+DqdCYRzo=; b=QHsu09HnK+5dlDoS2GdNHqmF0cvRMkUGk/nk8qKn/4YGwkBSAjEOOAi+ew5MVV+AI6 HgWUWERqjhLE51GCt4vzDStYcVsAEGZJo/MWkfdkdoA1tLP2ga38NxXRwdpv5Sh1P6kV z0PSqIUrmLz/4sZTuRC4he7tVsm7XKSQmFgG8tKVoCZOiv9AIq3PbmDGgR1THxjyIMlf bvMVU8IXkn04c/CiUYFtCKngNyC7MT9kE2Kdzs3pTzaiI2h8VyNQ0HRcIE6ur7Ucr9xf MWbIwevttHyYIKvfX8kPbDbH+gih7E7tol9ahaDnfFrzp2TThBWQp7V+EeeikWQtPrv/ f2Bg== X-Gm-Message-State: AOAM530CSlih4mUgsCJiPWya6XhdajZFYFREsMkbsM+4D64qrJB4aXyB +GnYX2ZWAp8ojXdTvqkWQGxoyM2SoZU= X-Google-Smtp-Source: ABdhPJykFRaRlXBaojklngrMWzzMi+AE/Ri/f9JoeyGhR1SzYF9FA8YbNxzu1MkcoaS3qIkqNFc8hZ2rAs0= X-Received: from seanjc.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:3e5]) (user=seanjc job=sendgmr) by 2002:a63:7110:: with SMTP id m16mr19433809pgc.123.1643217753999; Wed, 26 Jan 2022 09:22:33 -0800 (PST) Reply-To: Sean Christopherson Date: Wed, 26 Jan 2022 17:22:26 +0000 In-Reply-To: <20220126172226.2298529-1-seanjc@google.com> Message-Id: <20220126172226.2298529-4-seanjc@google.com> Mime-Version: 1.0 References: <20220126172226.2298529-1-seanjc@google.com> X-Mailer: git-send-email 2.35.0.rc0.227.g00780c9af4-goog Subject: [PATCH 3/3] KVM: x86: Sync the states size with the XCR0/IA32_XSS at, any time From: Sean Christopherson To: Paolo Bonzini Cc: Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Xiaoyao Li , Like Xu Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Like Xu XCR0 is reset to 1 by RESET but not INIT and IA32_XSS is zeroed by both RESET and INIT. The kvm_set_msr_common()'s handling of MSR_IA32_XSS also needs to update kvm_update_cpuid_runtime(). In the above cases, the size in bytes of the XSAVE area containing all states enabled by XCR0 or (XCRO | IA32_XSS) needs to be updated. For simplicity and consistency, existing helpers are used to write values and call kvm_update_cpuid_runtime(), and it's not exactly a fast path. Fixes: a554d207dc46 ("KVM: X86: Processor States following Reset or INIT") Cc: stable@vger.kernel.org Signed-off-by: Like Xu Signed-off-by: Sean Christopherson --- arch/x86/kvm/x86.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 13793582f26d..2e8a8fb42269 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -11257,8 +11257,8 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) vcpu->arch.msr_misc_features_enables = 0; - vcpu->arch.xcr0 = XFEATURE_MASK_FP; - vcpu->arch.ia32_xss = 0; + __kvm_set_xcr(vcpu, 0, XFEATURE_MASK_FP); + __kvm_set_msr(vcpu, MSR_IA32_XSS, 0, true); } /* All GPRs except RDX (handled below) are zeroed on RESET/INIT. */ -- 2.35.0.rc0.227.g00780c9af4-goog