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 34917C433F5 for ; Mon, 18 Apr 2022 13:57:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244392AbiDROAB (ORCPT ); Mon, 18 Apr 2022 10:00:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52824 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244664AbiDRN5J (ORCPT ); Mon, 18 Apr 2022 09:57:09 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A859B2AC73; Mon, 18 Apr 2022 06:06:51 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 61178B80EC4; Mon, 18 Apr 2022 13:06:50 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A81FFC385A7; Mon, 18 Apr 2022 13:06:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1650287209; bh=M5nIWoCDWAZJVGuO+TpW1pNc9qLraQMLOH1DQnAwwjo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pk5GpFfLwPsQBZjBi/7r6ARfPg2qss/dedb01KTiPtcOKcevpoOI2iN+OSVrIPWv4 Js1LwaEZuJ29c+qeyhkGC0ZBvJDRE9R/Hz91sbFIIGXMslZuOd6g5H2om8WHRSK/AH eV8s0VjVJFQVe3uHGgFahvnIFWIAo/3zoxs8RiO4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Zhenzhong Duan , Sean Christopherson , Paolo Bonzini , Sasha Levin Subject: [PATCH 4.9 091/218] KVM: x86: Fix emulation in writing cr8 Date: Mon, 18 Apr 2022 14:12:37 +0200 Message-Id: <20220418121202.211278109@linuxfoundation.org> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220418121158.636999985@linuxfoundation.org> References: <20220418121158.636999985@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Zhenzhong Duan [ Upstream commit f66af9f222f08d5b11ea41c1bd6c07a0f12daa07 ] In emulation of writing to cr8, one of the lowest four bits in TPR[3:0] is kept. According to Intel SDM 10.8.6.1(baremetal scenario): "APIC.TPR[bits 7:4] = CR8[bits 3:0], APIC.TPR[bits 3:0] = 0"; and SDM 28.3(use TPR shadow): "MOV to CR8. The instruction stores bits 3:0 of its source operand into bits 7:4 of VTPR; the remainder of VTPR (bits 3:0 and bits 31:8) are cleared."; and AMD's APM 16.6.4: "Task Priority Sub-class (TPS)-Bits 3 : 0. The TPS field indicates the current sub-priority to be used when arbitrating lowest-priority messages. This field is written with zero when TPR is written using the architectural CR8 register."; so in KVM emulated scenario, clear TPR[3:0] to make a consistent behavior as in other scenarios. This doesn't impact evaluation and delivery of pending virtual interrupts because processor does not use the processor-priority sub-class to determine which interrupts to delivery and which to inhibit. Sub-class is used by hardware to arbitrate lowest priority interrupts, but KVM just does a round-robin style delivery. Fixes: b93463aa59d6 ("KVM: Accelerated apic support") Signed-off-by: Zhenzhong Duan Reviewed-by: Sean Christopherson Message-Id: <20220210094506.20181-1-zhenzhong.duan@intel.com> Signed-off-by: Paolo Bonzini Signed-off-by: Sasha Levin --- arch/x86/kvm/lapic.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index bfed29a4c2ce..e5f92488c3cd 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -1767,10 +1767,7 @@ void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data) void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8) { - struct kvm_lapic *apic = vcpu->arch.apic; - - apic_set_tpr(apic, ((cr8 & 0x0f) << 4) - | (kvm_lapic_get_reg(apic, APIC_TASKPRI) & 4)); + apic_set_tpr(vcpu->arch.apic, (cr8 & 0x0f) << 4); } u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu) -- 2.34.1