Re: Does KVM use one EPT table per Guest CR3?

[Avi Kivity <avi@redhat.com>]

On 12/17/2010 05:24 PM, Avi Kivity wrote:
> On 12/17/2010 12:14 AM, Lok Kwong Yan wrote:
>> Thanks for the reply and it makes a lot of sense.
>>
>> I am not seeing any EPT tables being zapped after the guest has fully 
>> started up although the value of EPTP continuously changes as the 
>> guest is running.
>
> Really strange, this is likely a bug.
>

I tried to reproduce, the only times I see eptp changes are when the 
guest reprograms the vga adapter:

  qemu-system-x86-20944 [033]  1327.151819: kvm_pio:              
pio_write at 0x3ce size 2 count 1
  qemu-system-x86-20944 [033]  1327.151819: kvm_userspace_exit:   reason 
KVM_EXIT_IO (2)
  qemu-system-x86-20944 [033]  1327.152405: kvm_mmu_prepare_zap_page: 
[FAILED TO PARSE] gfn=237568 role=122881 root_count=0 unsync=0
...
  qemu-system-x86-20944 [033]  1327.153230: kvm_mmu_prepare_zap_page: 
[FAILED TO PARSE] gfn=0 role=253956 root_count=2 unsync=0
  qemu-system-x86-20944 [033]  1327.153339: kvm_mmu_get_page:     sp gfn 
0 0/4 q0 direct --- !pge !nxe root 0sync
  qemu-system-x86-20944 [033]  1327.153344: print:                
a0265cde vmx_set_cr3: eptp fef14101

Under what scenario do you see eptp changing?

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