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x86: don't print a warning when MTRR are blank and running in KVM 

Inside a KVM virtual machine the MTRRs are usually blank. This confuses Linux
and causes a warning message at boot. This patch removes that warning message
when running Linux as a KVM guest.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Joerg Roedel 2008-02-21 15:50:14 +01:00 committed by Ingo Molnar
parent 5d119b2c9a
commit 4147c8747e
1 changed files with 6 additions and 2 deletions
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8
arch/x86/kernel/cpu/mtrr/main.c
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@ -43,6 +43,7 @@
#include <asm/uaccess.h>
#include <asm/processor.h>
#include <asm/msr.h>
#include <asm/kvm_para.h>
#include "mtrr.h"
u32 num_var_ranges = 0;
@ -689,8 +690,11 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
/* kvm/qemu doesn't have mtrr set right, don't trim them all */
if (!highest_pfn) {
printk(KERN_WARNING "WARNING: strange, CPU MTRRs all blank?\n");
WARN_ON(1);
if (!kvm_para_available()) {
printk(KERN_WARNING
"WARNING: strange, CPU MTRRs all blank?\n");
WARN_ON(1);
}
return 0;
}