[tip:x86/xsave] x86/xsaves: Change compacted format xsave area header
From: tip-bot for Fenghua Yu
Date: Fri May 30 2014 - 11:11:39 EST
Commit-ID: 0b29643a58439dc9a8b0c0cacad0e7cb608c8199
Gitweb: http://git.kernel.org/tip/0b29643a58439dc9a8b0c0cacad0e7cb608c8199
Author: Fenghua Yu <fenghua.yu@xxxxxxxxx>
AuthorDate: Thu, 29 May 2014 11:12:33 -0700
Committer: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Thu, 29 May 2014 14:31:10 -0700
x86/xsaves: Change compacted format xsave area header
The XSAVE area header is changed to support both compacted format and
standard format of xsave area.
The XSAVE header of an xsave area comprises the 64 bytes starting at offset
512 from the area base address:
- Bytes 7:0 of the xsave header is a state-component bitmap called
xstate_bv. It identifies the state components in the xsave area.
- Bytes 15:8 of the xsave header is a state-component bitmap called
xcomp_bv. It is used as follows:
- xcomp_bv[63] indicates the format of the extended region of
the xsave area. If it is clear, the standard format is used.
If it is set, the compacted format is used.
- xcomp_bv[62:0] indicate which features (starting at feature 2)
have space allocated for them in the compacted format.
- Bytes 63:16 of the xsave header are reserved.
Signed-off-by: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1401387164-43416-6-git-send-email-fenghua.yu@xxxxxxxxx
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
---
arch/x86/include/asm/processor.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index a4ea023..2c8d3b8 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -386,8 +386,8 @@ struct bndcsr_struct {
struct xsave_hdr_struct {
u64 xstate_bv;
- u64 reserved1[2];
- u64 reserved2[5];
+ u64 xcomp_bv;
+ u64 reserved[6];
} __attribute__((packed));
struct xsave_struct {
--
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