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[PATCH] paravirt: Allow selected bug checks to be

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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 <zach@vmware.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
This commit is contained in:
Rusty Russell 2006-12-07 02:14:08 +01:00 committed by Andi Kleen
parent c9ccf30d77
commit 4f205fd45a
2 changed files with 5 additions and 1 deletions
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2
arch/i386/kernel/cpu/intel.c
View file

@ -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;

4
include/asm-i386/bugs.h
View file

@ -21,6 +21,7 @@
#include <asm/processor.h>
#include <asm/i387.h>
#include <asm/msr.h>
#include <asm/paravirt.h>
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");