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bh=CJ0Jw/rZGxVuVyRHLbKDpIzAQO9DG/ph6iOAbNKFjzE=; b=ZZLLBN70XfKV1LaLqdB9OHpt84JhXZ9iiTmWz382BJlKhr5HLW1k9HBS akqrKVUVQS+HzGi36E/LwQSRCtuN6vJb0nurXru/XtfJfS8jKPbcQZrqy QsqgFwbvtc6IRGheyb96o5me8195Gpcr1PhU89Ml9oiLNNYYw+ll9qDAV oMEi8eO3uKG0svRzg0ULOeNveE5b/JMnibfKMlszi2d0LmceDRO/dP53S n7WZ/CTkK4WsbtEe/hxN3tALXBmfgUWjUk+vNIf2/7IYKxX45pmhyR/rl q54osEFVXEJ5sQFFaVfPWTJnfW77zjQdrZbBMnLFm4HAey48Obh6m5OqD w==; X-IronPort-AV: E=McAfee;i="6600,9927,10988"; a="2535053" X-IronPort-AV: E=Sophos;i="6.06,170,1705392000"; d="scan'208";a="2535053" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orvoesa108.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Feb 2024 23:47:44 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10988"; a="826966078" X-IronPort-AV: E=Sophos;i="6.06,170,1705392000"; d="scan'208";a="826966078" Received: from jf.jf.intel.com (HELO jf.intel.com) ([10.165.9.183]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Feb 2024 23:47:43 -0800 From: Yang Weijiang To: seanjc@google.com, pbonzini@redhat.com, dave.hansen@intel.com, x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: peterz@infradead.org, chao.gao@intel.com, rick.p.edgecombe@intel.com, mlevitsk@redhat.com, john.allen@amd.com, weijiang.yang@intel.com Subject: [PATCH v10 07/27] x86/fpu/xstate: Warn if kernel dynamic xfeatures detected in normal fpstate Date: Sun, 18 Feb 2024 23:47:13 -0800 Message-ID: <20240219074733.122080-8-weijiang.yang@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240219074733.122080-1-weijiang.yang@intel.com> References: <20240219074733.122080-1-weijiang.yang@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1791313023208899010 X-GMAIL-MSGID: 1791313023208899010 Kernel dynamic xfeatures now are __ONLY__ enabled for guest fpstate, i.e., never for normal kernel fpstate. The bits are added when guest FPU config is initialized. Guest fpstate is allocated with fpstate->is_guest set to %true. For normal fpstate, the bits should have been removed when initializes kernel FPU config settings, WARN_ONCE() if kernel detects normal fpstate xfeatures contains kernel dynamic xfeatures before executes xsaves. Signed-off-by: Yang Weijiang Reviewed-by: Rick Edgecombe Reviewed-by: Maxim Levitsky --- arch/x86/kernel/fpu/xstate.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kernel/fpu/xstate.h b/arch/x86/kernel/fpu/xstate.h index 3518fb26d06b..83ebf1e1cbb4 100644 --- a/arch/x86/kernel/fpu/xstate.h +++ b/arch/x86/kernel/fpu/xstate.h @@ -185,6 +185,9 @@ static inline void os_xsave(struct fpstate *fpstate) WARN_ON_FPU(!alternatives_patched); xfd_validate_state(fpstate, mask, false); + WARN_ON_FPU(!fpstate->is_guest && + (mask & XFEATURE_MASK_KERNEL_DYNAMIC)); + XSTATE_XSAVE(&fpstate->regs.xsave, lmask, hmask, err); /* We should never fault when copying to a kernel buffer: */