From patchwork Wed Jan 5 12:35:20 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Zhong X-Patchwork-Id: 12704277 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 F02F5C433FE for ; Wed, 5 Jan 2022 12:36:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240171AbiAEMgR (ORCPT ); Wed, 5 Jan 2022 07:36:17 -0500 Received: from mga04.intel.com ([192.55.52.120]:6467 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240116AbiAEMgK (ORCPT ); Wed, 5 Jan 2022 07:36:10 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1641386170; x=1672922170; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Ge0BTlnpCjiQmZGsfpSwm7WW4/Ispa3drltAGv8CXNo=; b=d5ZnGbA6cB4RMYculfeZnLw18KOLPSGPpYJCmEKnJKtcwfzmMGFa2suZ gZFeaml66lVDrfXsw+tQqpkTMdi+QxFTGiO4yogq1XvySARzt0eKpMEIv VJm3stw8gjxFDRnY/ysWE/mG07xBAuVv8IbiH85M7YhkpMrsDbG8xVWnG IpwVoujA6lf5pLCMJYhCCXMMS6yj2s8HKiwHMUWyWmCoon4uirlzvQNKv df3P6M0IQNGhvgezgZmrF211QePJoykBmpFDqUNCkrVTqMH36iFYgdpTg iOTCY250XV7Wu1Z1ghK+V9Cx4315SulgxODDQq1V4bkb0HtXZvszsUqLn Q==; X-IronPort-AV: E=McAfee;i="6200,9189,10217"; a="241249375" X-IronPort-AV: E=Sophos;i="5.88,263,1635231600"; d="scan'208";a="241249375" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Jan 2022 04:35:37 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.88,263,1635231600"; d="scan'208";a="591004848" Received: from 984fee00bf64.jf.intel.com ([10.165.54.77]) by fmsmga004.fm.intel.com with ESMTP; 05 Jan 2022 04:35:37 -0800 From: Yang Zhong To: x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, pbonzini@redhat.com, corbet@lwn.net, shuah@kernel.org, seanjc@google.com Cc: jun.nakajima@intel.com, kevin.tian@intel.com, jing2.liu@linux.intel.com, jing2.liu@intel.com, guang.zeng@intel.com, wei.w.wang@intel.com, yang.zhong@intel.com Subject: [PATCH v5 09/21] x86/fpu: Provide fpu_update_guest_xfd() for IA32_XFD emulation Date: Wed, 5 Jan 2022 04:35:20 -0800 Message-Id: <20220105123532.12586-10-yang.zhong@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220105123532.12586-1-yang.zhong@intel.com> References: <20220105123532.12586-1-yang.zhong@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Kevin Tian Guest XFD can be updated either in the emulation path or in the restore path. Provide a wrapper to update guest_fpu::fpstate::xfd. If the guest fpstate is currently in-use, also update the per-cpu xfd cache and the actual MSR. Signed-off-by: Kevin Tian Signed-off-by: Jing Liu Signed-off-by: Yang Zhong --- arch/x86/include/asm/fpu/api.h | 6 ++++++ arch/x86/kernel/fpu/core.c | 12 ++++++++++++ 2 files changed, 18 insertions(+) diff --git a/arch/x86/include/asm/fpu/api.h b/arch/x86/include/asm/fpu/api.h index 1ed2a247a84e..e4d10155290b 100644 --- a/arch/x86/include/asm/fpu/api.h +++ b/arch/x86/include/asm/fpu/api.h @@ -140,6 +140,12 @@ extern void fpu_free_guest_fpstate(struct fpu_guest *gfpu); extern int fpu_swap_kvm_fpstate(struct fpu_guest *gfpu, bool enter_guest); extern int fpu_enable_guest_xfd_features(struct fpu_guest *guest_fpu, u64 xfeatures); +#ifdef CONFIG_X86_64 +extern void fpu_update_guest_xfd(struct fpu_guest *guest_fpu, u64 xfd); +#else +static inline void fpu_update_guest_xfd(struct fpu_guest *guest_fpu, u64 xfd) { } +#endif + extern void fpu_copy_guest_fpstate_to_uabi(struct fpu_guest *gfpu, void *buf, unsigned int size, u32 pkru); extern int fpu_copy_uabi_to_guest_fpstate(struct fpu_guest *gfpu, const void *buf, u64 xcr0, u32 *vpkru); diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c index 5b08d20a4005..8f7f9bfc2506 100644 --- a/arch/x86/kernel/fpu/core.c +++ b/arch/x86/kernel/fpu/core.c @@ -278,6 +278,18 @@ int fpu_enable_guest_xfd_features(struct fpu_guest *guest_fpu, u64 xfeatures) } EXPORT_SYMBOL_GPL(fpu_enable_guest_xfd_features); +#ifdef CONFIG_X86_64 +void fpu_update_guest_xfd(struct fpu_guest *guest_fpu, u64 xfd) +{ + fpregs_lock(); + guest_fpu->fpstate->xfd = xfd; + if (guest_fpu->fpstate->in_use) + xfd_update_state(guest_fpu->fpstate); + fpregs_unlock(); +} +EXPORT_SYMBOL_GPL(fpu_update_guest_xfd); +#endif /* CONFIG_X86_64 */ + int fpu_swap_kvm_fpstate(struct fpu_guest *guest_fpu, bool enter_guest) { struct fpstate *guest_fps = guest_fpu->fpstate;