linux-kernel - [PATCH 13/15] x86/xsaves: Call booting time xsaves and xrstors in setup_init_fpu

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Date:	Mon, 26 May 2014 10:01:20 -0700
From:	"Fenghua Yu" <fenghua.yu@...el.com>
To:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Asit K Mallick" <asit.k.mallick@...el.com>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"x86" <x86@...nel.org>, "Fenghua Yu" <fenghua.yu@...el.com>
Subject: [PATCH 13/15] x86/xsaves: Call booting time xsaves and xrstors in setup_init_fpu_buf

From: Fenghua Yu <fenghua.yu@...el.com>

setup_init_fpu_buf() calls booting time xsaves and xrstors to save/restore
xstate in xsave area.

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
 arch/x86/kernel/xsave.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c
index a4b451c..8fa7c7d 100644
--- a/arch/x86/kernel/xsave.c
+++ b/arch/x86/kernel/xsave.c
@@ -496,15 +496,21 @@ static void __init setup_init_fpu_buf(void)
 
 	setup_xstate_features();
 
+	if (cpu_has_xsaves) {
+		init_xstate_buf->xsave_hdr.xcomp_bv =
+						(u64)1 << 63 | pcntxt_mask;
+		init_xstate_buf->xsave_hdr.xstate_bv = pcntxt_mask;
+	}
+
 	/*
 	 * Init all the features state with header_bv being 0x0
 	 */
-	xrstor_state(init_xstate_buf, -1);
+	xrstor_state_booting(init_xstate_buf, -1);
 	/*
 	 * Dump the init state again. This is to identify the init state
 	 * of any feature which is not represented by all zero's.
 	 */
-	xsave_state(init_xstate_buf, -1);
+	xsave_state_booting(init_xstate_buf, -1);
 }
 
 static enum { AUTO, ENABLE, DISABLE } eagerfpu = AUTO;
-- 
1.8.1.2

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