diff options
| author | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2016-12-18 17:44:14 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-12-19 10:46:20 +0100 |
| commit | 2b4c91569a40c4512ea1b413e0c817d179ce9868 (patch) | |
| tree | e5fbc71b5b99ef05954438b413d6d1f04e72f710 /arch/x86 | |
| parent | a15a753539eca8ba243d576f02e7ca9c4b7d7042 (diff) | |
x86/microcode/AMD: Use native_cpuid() in load_ucode_amd_bsp()
When CONFIG_PARAVIRT is selected, cpuid() becomes a call. Since
for 32-bit kernels load_ucode_amd_bsp() is executed before paging
is enabled the call cannot be completed (as kernel virtual addresses
are not reachable yet).
Use native_cpuid() instead which is an asm wrapper for the CPUID
instruction.
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Jürgen Gross <jgross@suse.com>
Link: http://lkml.kernel.org/r/1481906392-3847-1-git-send-email-boris.ostrovsky@oracle.com
Link: http://lkml.kernel.org/r/20161218164414.9649-5-bp@alien8.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/cpu/microcode/amd.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c index dc80acfa922d..6a31e2691f3a 100644 --- a/arch/x86/kernel/cpu/microcode/amd.c +++ b/arch/x86/kernel/cpu/microcode/amd.c @@ -301,6 +301,7 @@ static bool get_builtin_microcode(struct cpio_data *cp, unsigned int family) void __init load_ucode_amd_bsp(unsigned int family) { struct ucode_cpu_info *uci; + u32 eax, ebx, ecx, edx; struct cpio_data cp; const char *path; bool use_pa; @@ -322,7 +323,10 @@ void __init load_ucode_amd_bsp(unsigned int family) return; /* Get BSP's CPUID.EAX(1), needed in load_microcode_amd() */ - uci->cpu_sig.sig = cpuid_eax(1); + eax = 1; + ecx = 0; + native_cpuid(&eax, &ebx, &ecx, &edx); + uci->cpu_sig.sig = eax; apply_microcode_early_amd(cp.data, cp.size, true, NULL); } |