From: Avi Kivity <avi@redhat.com>
To: Lok Kwong Yan <loyan@syr.edu>
Cc: Anthony Liguori <anthony@codemonkey.ws>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: Does KVM use one EPT table per Guest CR3?
Date: Sun, 19 Dec 2010 16:31:49 +0200 [thread overview]
Message-ID: <4D0E1755.6020407@redhat.com> (raw)
In-Reply-To: <4D0B80BC.3080700@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
next prev parent reply other threads:[~2010-12-19 14:32 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-07 21:47 Does KVM use one EPT table per Guest CR3? Lok Kwong Yan
2010-12-07 21:57 ` Anthony Liguori
2010-12-07 22:00 ` Lok Kwong Yan
2010-12-07 22:11 ` Anthony Liguori
2010-12-10 7:44 ` Lok Kwong Yan
2010-12-12 10:47 ` Avi Kivity
2010-12-16 22:14 ` Lok Kwong Yan
2010-12-17 15:24 ` Avi Kivity
2010-12-19 14:31 ` Avi Kivity [this message]
2010-12-22 21:56 ` Lok Kwong Yan
2011-02-10 20:47 ` Lok Kwong Yan
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