From 4f205fd45a5c192907188d6f8f6d7e66db859248 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Thu, 7 Dec 2006 02:14:08 +0100 Subject: [PATCH] [PATCH] paravirt: Allow selected bug checks to be Allow selected bug checks to be skipped by paravirt kernels. The two most important are the F00F workaround (which is either done by the hypervisor, or not required), and the 'hlt' instruction check, which can break under some hypervisors. Signed-off-by: Zachary Amsden Signed-off-by: Chris Wright Signed-off-by: Andi Kleen Cc: Rusty Russell Cc: Jeremy Fitzhardinge Signed-off-by: Andrew Morton --- arch/i386/kernel/cpu/intel.c | 2 +- include/asm-i386/bugs.h | 4 ++++ 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/i386/kernel/cpu/intel.c b/arch/i386/kernel/cpu/intel.c index 798c2f617e87..3ae795e9056d 100644 --- a/arch/i386/kernel/cpu/intel.c +++ b/arch/i386/kernel/cpu/intel.c @@ -107,7 +107,7 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c) * Note that the workaround only should be initialized once... */ c->f00f_bug = 0; - if ( c->x86 == 5 ) { + if (!paravirt_enabled() && c->x86 == 5) { static int f00f_workaround_enabled = 0; c->f00f_bug = 1; diff --git a/include/asm-i386/bugs.h b/include/asm-i386/bugs.h index 592ffeeda45e..38f1aebbbdb5 100644 --- a/include/asm-i386/bugs.h +++ b/include/asm-i386/bugs.h @@ -21,6 +21,7 @@ #include #include #include +#include static int __init no_halt(char *s) { @@ -91,6 +92,9 @@ static void __init check_fpu(void) static void __init check_hlt(void) { + if (paravirt_enabled()) + return; + printk(KERN_INFO "Checking 'hlt' instruction... "); if (!boot_cpu_data.hlt_works_ok) { printk("disabled\n");