STRLCPY/criu

compel: support XSAVE on newer Intel CPUs

Newer Intel CPUs (Sapphire Rapids) have a much larger xsave area than
before. Looking at older CPUs I see 2440 bytes.

    # cpuid -1 -l 0xd -s 0
    ...
        bytes required by XSAVE/XRSTOR area     = 0x00000988 (2440)

On newer CPUs (Sapphire Rapids) it grows to 11008 bytes.

    # cpuid -1 -l 0xd -s 0
    ...
        bytes required by XSAVE/XRSTOR area     = 0x00002b00 (11008)

This increase the xsave area from one page to four pages.

Without this patch the fpu03 test fails, with this patch it works again.

Signed-off-by: Adrian Reber <[email protected]>

Adrian Reber committed with Andrei Vagin 1 year ago

d739260c

1 parent 32c0983d

Total 1 files

■ ■ ■ ■ ■ ■ ■

compel/arch/x86/src/lib/include/uapi/asm/fpu.h

		skipped 20 lines
21	21		#define XSTATE_YMM 0x4
22	22
23	23		#define FXSAVE_SIZE 512
24		-	#define XSAVE_SIZE 4096
	24	+	/*
	25	+	* This used to be 4096 (one page). There is a comment below concerning
	26	+	* this size:
	27	+	* "One page should be enough for the whole xsave state ;-)"
	28	+	* Which is kind of funny as it is no longer enough ;-)
	29	+	*
	30	+	* Older CPUs:
	31	+	* # cpuid -1 -l 0xd -s 0
	32	+	* ...
	33	+	* bytes required by XSAVE/XRSTOR area = 0x00000988 (2440)
	34	+	*
	35	+	* Newer CPUs (Sapphire Rapids):
	36	+	* # cpuid -1 -l 0xd -s 0
	37	+	* ...
	38	+	* bytes required by XSAVE/XRSTOR area = 0x00002b00 (11008)
	39	+	*
	40	+	* So one page is no longer enough... But:
	41	+	*
	42	+	* Four pages should be enough for the whole xsave state ;-)
	43	+	*/
	44	+
	45	+	#define XSAVE_SIZE 4*4096
25	46
26	47		#define XSAVE_HDR_SIZE 64
27	48		#define XSAVE_HDR_OFFSET FXSAVE_SIZE
		skipped 207 lines
235	256		*
236	257		*
237	258		* One page should be enough for the whole xsave state ;-)
	259	+	*
	260	+	* Of course it was not ;-) Now using four pages...
	261	+	*
238	262		*/
239		-	#define EXTENDED_STATE_AREA_SIZE (4096 - sizeof(struct i387_fxsave_struct) - sizeof(struct xsave_hdr_struct))
	263	+	#define EXTENDED_STATE_AREA_SIZE (XSAVE_SIZE - sizeof(struct i387_fxsave_struct) - sizeof(struct xsave_hdr_struct))
240	264
241	265		/*
242	266		* cpu requires it to be 64 byte aligned
		skipped 85 lines