Re: [PATCH for-4.7] xen/nested_p2m: Don't walk EPT tables with a regular PT walker

["Jan Beulich" <JBeulich@suse.com>]

>>> On 13.05.16 at 17:24, <andrew.cooper3@citrix.com> wrote:
> On 13/05/16 16:00, Andrew Cooper wrote:
>> On 13/05/16 15:13, Jan Beulich wrote:
>>>>>> On 13.05.16 at 15:33, <andrew.cooper3@citrix.com> wrote:
>>>> --- a/xen/arch/x86/mm/hap/nested_hap.c
>>>> +++ b/xen/arch/x86/mm/hap/nested_hap.c
>>>> @@ -141,7 +141,7 @@ nestedhap_fix_p2m(struct vcpu *v, struct p2m_domain 
> *p2m,
>>>>   * walk is successful, the translated value is returned in
>>>>   * L1_gpa. The result value tells what to do next.
>>>>   */
>>>> -static int
>>>> +int
>>>>  nestedhap_walk_L1_p2m(struct vcpu *v, paddr_t L2_gpa, paddr_t *L1_gpa,
>>>>                        unsigned int *page_order, uint8_t *p2m_acc,
>>> The function becoming non-static widens the visibility of the bogus
>>> uint8_t here (should be p2m_access_t afaics). Granted this isn't an
>>> issue the patch introduces, but I would prefer this to be adjusted
>>> prior to dropping the static here...
>>>
>>>> --- a/xen/arch/x86/mm/p2m.c
>>>> +++ b/xen/arch/x86/mm/p2m.c
>>>> @@ -2081,20 +2081,29 @@ unsigned long paging_gva_to_gfn(struct vcpu *v,
>>>>  
>>>>      if ( is_hvm_vcpu(v) && paging_mode_hap(v->domain) && nestedhvm_is_n2(v) )
>>>>      {
>>>> -        unsigned long gfn;
>>>> +        unsigned long l2_gfn, l1_gfn;
>>>>          struct p2m_domain *p2m;
>>>>          const struct paging_mode *mode;
>>>> -        uint32_t pfec_21 = *pfec;
>>>>          uint64_t np2m_base = nhvm_vcpu_p2m_base(v);
>>>> +        uint8_t l1_p2ma;
>>> ... avoiding proliferation of the quirkiness.
>> Will do.
> 
> It turns out that this is currently hard, due to a tangle of header files.

And I withdraw the request then.

> I will put this on my TODO list, but this point, I have more important
> things to do for 4.7.

Thanks, understood.

Jan


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