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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 65D68C433EF for ; Fri, 1 Oct 2021 22:44:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4FD8E61AAD for ; Fri, 1 Oct 2021 22:44:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1356062AbhJAWqV (ORCPT ); Fri, 1 Oct 2021 18:46:21 -0400 Received: from mga17.intel.com ([192.55.52.151]:38076 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230357AbhJAWqL (ORCPT ); Fri, 1 Oct 2021 18:46:11 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10124"; a="205756636" X-IronPort-AV: E=Sophos;i="5.85,340,1624345200"; d="scan'208";a="205756636" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Oct 2021 15:44:22 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.85,340,1624345200"; d="scan'208";a="565343988" Received: from chang-linux-3.sc.intel.com ([172.25.66.175]) by fmsmga002.fm.intel.com with ESMTP; 01 Oct 2021 15:44:15 -0700 From: "Chang S. Bae" To: bp@suse.de, luto@kernel.org, tglx@linutronix.de, mingo@kernel.org, x86@kernel.org Cc: len.brown@intel.com, lenb@kernel.org, dave.hansen@intel.com, thiago.macieira@intel.com, jing2.liu@intel.com, ravi.v.shankar@intel.com, linux-kernel@vger.kernel.org, chang.seok.bae@intel.com, kvm@vger.kernel.org Subject: [PATCH v11 10/29] x86/fpu/xstate: Update the XSTATE save function to support dynamic states Date: Fri, 1 Oct 2021 15:37:09 -0700 Message-Id: <20211001223728.9309-11-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211001223728.9309-1-chang.seok.bae@intel.com> References: <20211001223728.9309-1-chang.seok.bae@intel.com> Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Extend os_xsave() to receive a mask argument of which states to save, in preparation for dynamic user state handling. Update KVM to set a valid fpu->state_mask, so it can continue to share with the core code. Signed-off-by: Chang S. Bae Reviewed-by: Len Brown Cc: x86@kernel.org Cc: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org --- Changes from v5: * Adjusted the changelog and code for the new base code. Changes from v3: * Updated the changelog. (Borislav Petkov) * Made the code change more reviewable. Changes from v2: * Updated the changelog to clarify the KVM code changes. --- arch/x86/include/asm/fpu/internal.h | 3 +-- arch/x86/kernel/fpu/core.c | 2 +- arch/x86/kernel/fpu/signal.c | 2 +- arch/x86/kvm/x86.c | 9 +++++++-- 4 files changed, 10 insertions(+), 6 deletions(-) diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h index d2fc19c0e457..263e349ff85a 100644 --- a/arch/x86/include/asm/fpu/internal.h +++ b/arch/x86/include/asm/fpu/internal.h @@ -298,9 +298,8 @@ static inline void os_xrstor_booting(struct xregs_state *xstate) * Uses either XSAVE or XSAVEOPT or XSAVES depending on the CPU features * and command line options. The choice is permanent until the next reboot. */ -static inline void os_xsave(struct xregs_state *xstate) +static inline void os_xsave(struct xregs_state *xstate, u64 mask) { - u64 mask = xfeatures_mask_all; u32 lmask = mask; u32 hmask = mask >> 32; int err; diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c index 2941d03912db..164e75c37dbb 100644 --- a/arch/x86/kernel/fpu/core.c +++ b/arch/x86/kernel/fpu/core.c @@ -99,7 +99,7 @@ EXPORT_SYMBOL(irq_fpu_usable); void save_fpregs_to_fpstate(struct fpu *fpu) { if (likely(use_xsave())) { - os_xsave(&fpu->state->xsave); + os_xsave(&fpu->state->xsave, fpu->state_mask); /* * AVX512 state is tracked here because its use is diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c index 8b333b1a4d07..fe2732db6d6b 100644 --- a/arch/x86/kernel/fpu/signal.c +++ b/arch/x86/kernel/fpu/signal.c @@ -365,7 +365,7 @@ static int __fpu_restore_sig(void __user *buf, void __user *buf_fx, * the right place in memory. It's ia32 mode. Shrug. */ if (xfeatures_mask_supervisor()) - os_xsave(&fpu->state->xsave); + os_xsave(&fpu->state->xsave, fpu->state_mask); set_thread_flag(TIF_NEED_FPU_LOAD); } __fpu_invalidate_fpregs_state(fpu); diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 7c6dcc21e962..b0de53f4e5e9 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -9908,11 +9908,16 @@ static void kvm_save_current_fpu(struct fpu *fpu) * KVM does not support dynamic user states yet. Assume the buffer * always has the minimum size. */ - if (test_thread_flag(TIF_NEED_FPU_LOAD)) + if (test_thread_flag(TIF_NEED_FPU_LOAD)) { memcpy(fpu->state, current->thread.fpu.state, fpu_buf_cfg.min_size); - else + } else { + struct fpu *src_fpu = ¤t->thread.fpu; + + if (fpu->state_mask != src_fpu->state_mask) + fpu->state_mask = src_fpu->state_mask; save_fpregs_to_fpstate(fpu); + } } /* Swap (qemu) user FPU context for the guest FPU context. */ -- 2.17.1