linux-kernel - [PATCH v5 12/13] x86/xsaves: Fix fpstate

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Message-Id: <9c6c58a0a4a66568b8e887944d2426d59370ae05.1462816638.git.yu-cheng.yu@intel.com>
Date:	Mon,  9 May 2016 13:46:09 -0700
From:	Yu-cheng Yu <yu-cheng.yu@...el.com>
To:	linux-kernel@...r.kernel.org, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
Cc:	Dave Hansen <dave.hansen@...ux.intel.com>,
	Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...e.de>,
	Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
	"Ravi V. Shankar" <ravi.v.shankar@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Yu-cheng Yu <yu-cheng.yu@...el.com>
Subject: [PATCH v5 12/13] x86/xsaves: Fix fpstate_init() for XSAVES

When XSAVES is used, xsave.header.xcomp_bv[63] must be set.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.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