From: Andi Kleen Date: Wed, 11 Jan 2006 21:45:27 +0000 (+0100) Subject: [PATCH] i386: Replace broken serialize_cpu in microcode driver with correct sync_core X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=487472bc01fab0625996aad37836aad931e4eda9;p=linux-beck.git [PATCH] i386: Replace broken serialize_cpu in microcode driver with correct sync_core Passing random input values in eax to cpuid is not a good idea because the CPU will GPF for unknown ones. Use the correct x86-64 version that exists for a longer time too. This also adds a memory barrier to prevent the optimizer from reordering. Cc: tigran@veritas.com Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- diff --git a/arch/i386/kernel/microcode.c b/arch/i386/kernel/microcode.c index fad3037ebaef..d3fdf0057d82 100644 --- a/arch/i386/kernel/microcode.c +++ b/arch/i386/kernel/microcode.c @@ -166,7 +166,7 @@ static void collect_cpu_info (void *unused) wrmsr(MSR_IA32_UCODE_REV, 0, 0); /* see notes above for revision 1.07. Apparent chip bug */ - serialize_cpu(); + sync_core(); /* get the current revision from MSR 0x8B */ rdmsr(MSR_IA32_UCODE_REV, val[0], uci->rev); pr_debug("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n", @@ -380,7 +380,7 @@ static void do_update_one (void * unused) wrmsr(MSR_IA32_UCODE_REV, 0, 0); /* see notes above for revision 1.07. Apparent chip bug */ - serialize_cpu(); + sync_core(); /* get the current revision from MSR 0x8B */ rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]); diff --git a/include/asm-i386/processor.h b/include/asm-i386/processor.h index 53461f42b663..13ecf66b098c 100644 --- a/include/asm-i386/processor.h +++ b/include/asm-i386/processor.h @@ -281,9 +281,11 @@ static inline void clear_in_cr4 (unsigned long mask) outb((data), 0x23); \ } while (0) -static inline void serialize_cpu(void) +/* Stop speculative execution */ +static inline void sync_core(void) { - __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx"); + int tmp; + asm volatile("cpuid" : "=a" (tmp) : "0" (1) : "ebx","ecx","edx","memory"); } static inline void __monitor(const void *eax, unsigned long ecx,