Re: IO on guest is 20 times slower than host

[Avi Kivity <avi@redhat.com>]

Joerg Roedel wrote:
>> --- a/kernel/x86/kvm/svm.c
>> +++ b/kernel/x86/kvm/svm.c
>> @@ -575,7 +575,7 @@ static void init_vmcb(struct vcpu_svm *svm)
>>  						INTERCEPT_CR3_MASK);
>>  		control->intercept_cr_write &= ~(INTERCEPT_CR0_MASK|
>>  						 INTERCEPT_CR3_MASK);
>> -		save->g_pat = 0x0007040600070406ULL;
>> +		save->g_pat = 0x0606060606060606ULL;
>>  		/* enable caching because the QEMU Bios doesn't enable it */
>>  		save->cr0 = X86_CR0_ET;
>>  		save->cr3 = 0;
>>     
>
> Yeah, that patch makes sense. But I think we need some more work on this
> because the guest may change the pat msr afterwards. Best would be a simple
> shadow of the pat msr. Last question is how this will effect pci passthrough.	

This is just a stopgap; we can later add proper pat shadowing.

-- 
error compiling committee.c: too many arguments to function