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authorRobert Richter <robert.richter@amd.com>2010-07-21 19:03:54 +0200
committerH. Peter Anvin <hpa@linux.intel.com>2010-07-21 14:06:04 -0700
commitee813d53a8e980a3a28318efb8935d45723f5211 (patch)
tree4729849d80a1fde57071b3baacdae78528348a68 /arch/x86/kernel/xsave.c
parent97e80a70db689fb1e876df9f12305cc72f85ca53 (diff)
x86, xsave: Check cpuid level for XSTATE_CPUID (0x0d)
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>
Diffstat (limited to 'arch/x86/kernel/xsave.c')
-rw-r--r--arch/x86/kernel/xsave.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c
index 2322f586c051..5adb7fb408f0 100644
--- a/arch/x86/kernel/xsave.c
+++ b/arch/x86/kernel/xsave.c
@@ -379,7 +379,7 @@ static void setup_xstate_features(void)
xstate_sizes = alloc_bootmem(xstate_features * sizeof(int));
do {
- cpuid_count(0xd, leaf, &eax, &ebx, &ecx, &edx);
+ cpuid_count(XSTATE_CPUID, leaf, &eax, &ebx, &ecx, &edx);
if (eax == 0)
break;
@@ -425,7 +425,12 @@ static void __cpuinit xstate_enable_boot_cpu(void)
{
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);
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
*/
- cpuid_count(0xd, 0, &eax, &ebx, &ecx, &edx);
+ cpuid_count(XSTATE_CPUID, 0, &eax, &ebx, &ecx, &edx);
xstate_size = ebx;
update_regset_xstate_info(xstate_size, pcntxt_mask);