From: Boris Ostrovsky <boris.ostrov...@oracle.com> 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.ostrov...@oracle.com> Cc: Jürgen Gross <jgr...@suse.com> Cc: x86-ml <x...@kernel.org> Link: http://lkml.kernel.org/r/1481906392-3847-1-git-send-email-boris.ostrov...@oracle.com Signed-off-by: Borislav Petkov <b...@suse.de> --- arch/x86/kernel/cpu/microcode/amd.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) 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); } -- 2.11.0
