From patchwork Wed Dec 8 00:03:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Zhong X-Patchwork-Id: 12662077 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 572A8C433F5 for ; Tue, 7 Dec 2021 15:09:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238616AbhLGPNI (ORCPT ); Tue, 7 Dec 2021 10:13:08 -0500 Received: from mga14.intel.com ([192.55.52.115]:5480 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238622AbhLGPNE (ORCPT ); Tue, 7 Dec 2021 10:13:04 -0500 X-IronPort-AV: E=McAfee;i="6200,9189,10190"; a="237821116" X-IronPort-AV: E=Sophos;i="5.87,293,1631602800"; d="scan'208";a="237821116" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Dec 2021 07:09:34 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.87,293,1631602800"; d="scan'208";a="461289832" Received: from icx.bj.intel.com ([10.240.192.117]) by orsmga003.jf.intel.com with ESMTP; 07 Dec 2021 07:09:30 -0800 From: Yang Zhong To: x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, pbonzini@redhat.com Cc: seanjc@google.com, jun.nakajima@intel.com, kevin.tian@intel.com, jing2.liu@linux.intel.com, jing2.liu@intel.com, yang.zhong@intel.com Subject: [PATCH 07/19] kvm: x86: Propagate fpstate reallocation error to userspace Date: Tue, 7 Dec 2021 19:03:47 -0500 Message-Id: <20211208000359.2853257-8-yang.zhong@intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211208000359.2853257-1-yang.zhong@intel.com> References: <20211208000359.2853257-1-yang.zhong@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Jing Liu fpstate reallocation is handled when the vCPU thread returns to userspace. As reallocation could fail (e.g. lack of memory), this patch extends kvm_put_guest_fpu() to return an integer value to carry error code to userspace VMM. The userspace VMM is expected to handle any error caused by fpstate reallocation. Signed-off-by: Jing Liu Signed-off-by: Yang Zhong --- arch/x86/kvm/x86.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 0ee1a039b490..05f2cda73d69 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -10171,17 +10171,21 @@ static void kvm_load_guest_fpu(struct kvm_vcpu *vcpu) } /* When vcpu_run ends, restore user space FPU context. */ -static void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) +static int kvm_put_guest_fpu(struct kvm_vcpu *vcpu) { - fpu_swap_kvm_fpstate(&vcpu->arch.guest_fpu, false); + int ret; + + ret = fpu_swap_kvm_fpstate(&vcpu->arch.guest_fpu, false); ++vcpu->stat.fpu_reload; trace_kvm_fpu(0); + + return ret; } int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) { struct kvm_run *kvm_run = vcpu->run; - int r; + int r, ret; vcpu_load(vcpu); kvm_sigset_activate(vcpu); @@ -10243,7 +10247,10 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) r = vcpu_run(vcpu); out: - kvm_put_guest_fpu(vcpu); + ret = kvm_put_guest_fpu(vcpu); + if ((r >= 0) && (ret < 0)) + r = ret; + if (kvm_run->kvm_valid_regs) store_regs(vcpu); post_kvm_run_save(vcpu);