the version of guest os is 2.6.16.60-0.21-bigsmp.
the virtio driver we use from RHEL5.5.
2010/11/9 Gleb Natapov <gleb@xxxxxxxxxx>:
> On Tue, Nov 09, 2010 at 05:04:15PM +0800, lidong chen wrote:
>> how to configure virtio to use MSI? I didn't found out it.
>> thanks.
>>
> It looks like it should be enabled by default. What is you guest?
>
>> 2010/11/9 Gleb Natapov <gleb@xxxxxxxxxx>:
>> > On Tue, Nov 09, 2010 at 03:37:44PM +0800, lidong chen wrote:
>> >> sorry,i take mistake,
>> >>
>> >> the ept violation is not caused by 2M hugepages, but caused by e1000
>> >> emulated by qemu.
>> >> I test uesd 2M hugepages and virio, the performance is better than
>> >> e1000. but is still worse than xen. I will continue to find out other
>> >> reason.
>> >>
>> >>
>> >>
>> >> so, there are two question:
>> >> 1.why have so many ept violation when used e1000?
>> >>
>> >>
>> >> 2.when used virtio, there ara also such error happen.is this normal?
>> >> I add the printk in function tdp_page_fault below.
>> >> pfn = gfn_to_pfn(vcpu->kvm, gfn);
>> >> if (is_error_pfn(pfn)) {
>> >> kvm_release_pfn_clean(pfn);
>> >> if( printk_ratelimit() ) {
>> >> printk(KERN_EMERG "error gpa is %ld\n", gpa);
>> >> }
>> >> return is_fault_pfn(pfn) ? -EFAULT : 1;
>> >> }
>> >>
>> >> and result is:
>> >> [root@rhel6-kvm1 ~]# dmesg -c
>> >> __ratelimit: 387 callbacks suppressed
>> >> error gpa is 4273995776
>> >> error gpa is 4273995776
>> >> error gpa is 4273995776
>> >> error gpa is 4273995776
>> >> error gpa is 4273995776
>> >>
>> > You should really print this in hex :) This is 0xfec00000 AKA
>> > IOAPIC. Try to configure virtio to use MSI.
>> >
>> > --
>> > Gleb.
>> >
>
> --
> Gleb.
>
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