AuxXxilium/linux_dsm_epyc7002
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x86, xsave: Check cpuid level for XSTATE_CPUID (0x0d)

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The patch introduces the XSTATE_CPUID macro and adds a check that
tests if XSTATE_CPUID exists.

Signed-off-by: Robert Richter <robert.richter@amd.com>
LKML-Reference: <1279731838-1522-4-git-send-email-robert.richter@amd.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Robert Richter 2010-07-21 19:03:54 +02:00 committed by H. Peter Anvin
parent 97e80a70db
commit ee813d53a8
2 changed files with 10 additions and 3 deletions
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2
arch/x86/include/asm/xsave.h
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@ -4,6 +4,8 @@
#include <linux/types.h> #include <linux/types.h>
#include <asm/processor.h> #include <asm/processor.h>
#define XSTATE_CPUID 0x0000000d
#define XSTATE_FP 0x1 #define XSTATE_FP 0x1
#define XSTATE_SSE 0x2 #define XSTATE_SSE 0x2
#define XSTATE_YMM 0x4 #define XSTATE_YMM 0x4

11
arch/x86/kernel/xsave.c
View File

@ -379,7 +379,7 @@ static void setup_xstate_features(void)
xstate_sizes = alloc_bootmem(xstate_features * sizeof(int)); xstate_sizes = alloc_bootmem(xstate_features * sizeof(int));
do { do {
cpuid_count(0xd, leaf, &eax, &ebx, &ecx, &edx); cpuid_count(XSTATE_CPUID, leaf, &eax, &ebx, &ecx, &edx);
if (eax == 0) if (eax == 0)
break; break;
@ -425,7 +425,12 @@ static void __cpuinit xstate_enable_boot_cpu(void)
{ {
unsigned int eax, ebx, ecx, edx; unsigned int eax, ebx, ecx, edx;
cpuid_count(0xd, 0, &eax, &ebx, &ecx, &edx); if (boot_cpu_data.cpuid_level < XSTATE_CPUID) {
WARN(1, KERN_ERR "XSTATE_CPUID missing\n");
return;
}
cpuid_count(XSTATE_CPUID, 0, &eax, &ebx, &ecx, &edx);
pcntxt_mask = eax + ((u64)edx << 32); pcntxt_mask = eax + ((u64)edx << 32);
if ((pcntxt_mask & XSTATE_FPSSE) != XSTATE_FPSSE) { if ((pcntxt_mask & XSTATE_FPSSE) != XSTATE_FPSSE) {
@ -444,7 +449,7 @@ static void __cpuinit xstate_enable_boot_cpu(void)
/* /*
* Recompute the context size for enabled features * Recompute the context size for enabled features
*/ */
cpuid_count(0xd, 0, &eax, &ebx, &ecx, &edx); cpuid_count(XSTATE_CPUID, 0, &eax, &ebx, &ecx, &edx);
xstate_size = ebx; xstate_size = ebx;
update_regset_xstate_info(xstate_size, pcntxt_mask); update_regset_xstate_info(xstate_size, pcntxt_mask);