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SubjectRe: [PATCH 15/18] KVM: MMU: Propagate the right fault back to the guest after gva_to_gpa
On 03/15/2010 11:06 AM, Joerg Roedel wrote:
> On Mon, Mar 15, 2010 at 09:36:52AM +0200, Avi Kivity wrote:
>
>> On 03/03/2010 09:12 PM, Joerg Roedel wrote:
>>
>>> This patch implements logic to make sure that either a
>>> page-fault/page-fault-vmexit or a nested-page-fault-vmexit
>>> is propagated back to the guest.
>>>
>>> Signed-off-by: Joerg Roedel<joerg.roedel@amd.com>
>>> ---
>>> arch/x86/kvm/mmu.h | 1 +
>>> arch/x86/kvm/paging_tmpl.h | 2 ++
>>> arch/x86/kvm/x86.c | 15 ++++++++++++++-
>>> 3 files changed, 17 insertions(+), 1 deletions(-)
>>>
>>> diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
>>> index 64f619b..b42b27e 100644
>>> --- a/arch/x86/kvm/mmu.h
>>> +++ b/arch/x86/kvm/mmu.h
>>> @@ -47,6 +47,7 @@
>>> #define PFERR_USER_MASK (1U<< 2)
>>> #define PFERR_RSVD_MASK (1U<< 3)
>>> #define PFERR_FETCH_MASK (1U<< 4)
>>> +#define PFERR_NESTED_MASK (1U<< 31)
>>>
>>>
>>
>> Why is this needed? Queue an ordinary page fault page; the injection
>> code should check the page fault intercept and #VMEXIT if needed.
>>
> This is needed because we could have a nested page fault or an ordinary
> page fault which need to be propagated.
>

Right.

Why is pio_copy_data() changed? One would think that it would be an
all-or-nothing affair.

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



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