From: Yu-cheng Yu <yu-cheng.yu@intel.com>
To: linux-kernel@vger.kernel.org, x86@kernel.org,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>, Borislav Petkov <bp@suse.de>,
Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
Fenghua Yu <fenghua.yu@intel.com>,
Yu-cheng Yu <yu-cheng.yu@intel.com>
Subject: [PATCH v5 12/13] x86/xsaves: Fix fpstate_init() for XSAVES
Date: Mon, 9 May 2016 13:46:09 -0700 [thread overview]
Message-ID: <9c6c58a0a4a66568b8e887944d2426d59370ae05.1462816638.git.yu-cheng.yu@intel.com> (raw)
In-Reply-To: <cover.1462816638.git.yu-cheng.yu@intel.com>
In-Reply-To: <cover.1462816638.git.yu-cheng.yu@intel.com>
When XSAVES is used, xsave.header.xcomp_bv[63] must be set.
Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
---
arch/x86/kernel/fpu/core.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index 41ab106..25e2605 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -224,6 +224,9 @@ void fpstate_init(union fpregs_state *state)
memset(state, 0, kernel_xstate_size);
+ if (cpu_has_xsaves)
+ state->xsave.header.xcomp_bv = (u64)1 << 63;
+
if (cpu_has_fxsr)
fpstate_init_fxstate(&state->fxsave);
else
--
1.9.1
next prev parent reply other threads:[~2016-05-09 20:51 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-09 20:45 [PATCH v5 00/12] x86/xsaves: Fix XSAVES issues Yu-cheng Yu
2016-05-09 20:45 ` [PATCH v5 01/13] x86/xsaves: Define and use user_xstate_size for xstate size in signal context Yu-cheng Yu
2016-05-10 11:04 ` Borislav Petkov
2016-05-10 15:59 ` Yu-cheng Yu
2016-05-10 16:29 ` Borislav Petkov
2016-05-10 16:30 ` Yu-cheng Yu
2016-05-09 20:45 ` [PATCH v5 02/13] x86/xsaves: Rename xstate_size to kernel_xstate_size to explicitly distinguish xstate size in kernel from user space Yu-cheng Yu
2016-05-10 17:01 ` Borislav Petkov
2016-05-10 17:08 ` Dave Hansen
2016-05-10 17:26 ` Borislav Petkov
2016-05-10 17:31 ` Dave Hansen
2016-05-09 20:46 ` [PATCH v5 03/13] x86/xsaves: Keep init_fpstate.xsave.header.xfeatures as zero for init optimization Yu-cheng Yu
2016-05-09 20:46 ` [PATCH v5 04/13] x86/xsaves: Introduce a new check that allows correct xstates copy from kernel to user directly Yu-cheng Yu
2016-05-09 22:09 ` Dave Hansen
2016-05-09 20:46 ` [PATCH v5 05/13] x86/xsaves: Align xstate components according to CPUID Yu-cheng Yu
2016-05-09 20:46 ` [PATCH v5 06/13] x86/xsaves: Supervisor state component offset Yu-cheng Yu
2016-05-09 20:46 ` [PATCH v5 07/13] x86/xsaves: Fix PTRACE frames for XSAVES Yu-cheng Yu
2016-05-09 20:46 ` [PATCH v5 08/13] x86/xsaves: Fix XSTATE component offset print out Yu-cheng Yu
2016-05-09 20:46 ` [PATCH v5 09/13] x86/xsaves: Fix xstate_offsets, xstate_sizes for non-extended states Yu-cheng Yu
2016-05-09 20:46 ` [PATCH v5 10/13] x86/xsaves: Fix __fpu_restore_sig() for XSAVES Yu-cheng Yu
2016-05-09 23:43 ` Dave Hansen
2016-05-09 20:46 ` [PATCH v5 11/13] x86/xsaves: Add WARN_ON_FPU() when a disabled xstate component offset is requested for a compacted format Yu-cheng Yu
2016-05-09 23:31 ` Dave Hansen
2016-05-09 23:44 ` Yu-cheng Yu
2016-05-09 23:54 ` Dave Hansen
2016-05-09 20:46 ` Yu-cheng Yu [this message]
2016-05-09 23:41 ` [PATCH v5 12/13] x86/xsaves: Fix fpstate_init() for XSAVES Dave Hansen
2016-05-09 23:50 ` Yu-cheng Yu
2016-05-10 0:01 ` Dave Hansen
2016-05-09 20:46 ` [PATCH v5 13/13] x86/xsaves: Re-enable XSAVES Yu-cheng Yu
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