linux-kernel - [PATCH 1/2] x86, fpu: use kvm definition of compaction bit and make it generic

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Date:	Tue, 28 Apr 2015 10:00:09 -0700
From:	Dave Hansen <dave@...1.net>
To:	linux-kernel@...r.kernel.org
Cc:	Dave Hansen <dave@...1.net>, dave.hansen@...ux.intel.com,
	x86@...nel.org, fenghua.yu@...el.com, bp@...en8.de,
	oleg@...hat.com, luto@...capital.net
Subject: [PATCH 1/2] x86, fpu: use kvm definition of compaction bit and make it generic


From: Dave Hansen <dave.hansen@...ux.intel.com>

We will use this in non-KVM code in the next patch.

Note that we are also renaming the macro.  It is not really
an 'XSTATE' like would go in XSTATE_BV, or be used as part
of the "instruction mask".  It goes in XCOMP_BV, so make
that explicit in the name.

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: x86@...nel.org
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Andy Lutomirski <luto@...capital.net>
---

 b/arch/x86/include/asm/xsave.h |    2 ++
 b/arch/x86/kvm/x86.c           |    7 +++----
 2 files changed, 5 insertions(+), 4 deletions(-)

diff -puN arch/x86/include/asm/xsave.h~x86-fpu-take-kvm-def-and-make-generic arch/x86/include/asm/xsave.h
--- a/arch/x86/include/asm/xsave.h~x86-fpu-take-kvm-def-and-make-generic	2015-04-28 09:15:28.503683137 -0700
+++ b/arch/x86/include/asm/xsave.h	2015-04-28 09:15:28.522683994 -0700
@@ -38,6 +38,8 @@
 /* All currently supported features */
 #define XCNTXT_MASK	(XSTATE_LAZY | XSTATE_EAGER)
 
+#define XCOMP_BV_COMPACTION_ENABLED (1ULL << 63)
+
 #ifdef CONFIG_X86_64
 #define REX_PREFIX	"0x48, "
 #else
diff -puN arch/x86/kvm/x86.c~x86-fpu-take-kvm-def-and-make-generic arch/x86/kvm/x86.c
--- a/arch/x86/kvm/x86.c~x86-fpu-take-kvm-def-and-make-generic	2015-04-28 09:15:28.508683362 -0700
+++ b/arch/x86/kvm/x86.c	2015-04-28 09:15:28.534684535 -0700
@@ -3169,8 +3169,6 @@ static int kvm_vcpu_ioctl_x86_set_debugr
 	return 0;
 }
 
-#define XSTATE_COMPACTION_ENABLED (1ULL << 63)
-
 static void fill_xsave(u8 *dest, struct kvm_vcpu *vcpu)
 {
 	struct xsave_struct *xsave = &vcpu->arch.guest_fpu.state->xsave;
@@ -3222,7 +3220,8 @@ static void load_xsave(struct kvm_vcpu *
 	/* Set XSTATE_BV and possibly XCOMP_BV.  */
 	xsave->xsave_hdr.xstate_bv = xstate_bv;
 	if (cpu_has_xsaves)
-		xsave->xsave_hdr.xcomp_bv = host_xcr0 | XSTATE_COMPACTION_ENABLED;
+		xsave->xsave_hdr.xcomp_bv =
+			host_xcr0 | XCOMP_BV_COMPACTION_ENABLED;
 
 	/*
 	 * Copy each region from the non-compacted offset to the
@@ -6992,7 +6991,7 @@ int fx_init(struct kvm_vcpu *vcpu)
 	fpu_finit(&vcpu->arch.guest_fpu);
 	if (cpu_has_xsaves)
 		vcpu->arch.guest_fpu.state->xsave.xsave_hdr.xcomp_bv =
-			host_xcr0 | XSTATE_COMPACTION_ENABLED;
+			host_xcr0 | XCOMP_BV_COMPACTION_ENABLED;
 
 	/*
 	 * Ensure guest xcr0 is valid for loading
_
--
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