Re: [Xen-devel] Mapping Dom0 page in hypervisor from domctl

[Bread Cutter <cutter409@xxxxxxxxx>]

Thank you very much, that seems to have fixed my problem.

My new approach:
--------
guest_get_eff_l1e(current, domctl->va, &pte);
page_info = l1e_get_page(pte);
if ( ((l1e_get_flags(pte) & (_PAGE_PRESENT)) != _PAGE_PRESENT) )
{
    ret = -ENOMEM;
    break;
}

d->arch.hvm_domain.dom0_mapping.page_info = page_info;
d->arch.hvm_domain.dom0_mapping.buffer = (uint8_t*)__map_domain_page(page_info);
--------

Thanks!

On Mon, Jul 6, 2015 at 5:47 AM, Tim Deegan <tim@xxxxxxx> wrote:
> Hi,
>
> At 08:14 -0400 on 02 Jul (1435824854), Bread Cutter wrote:
>>             /* Translate the given virtual address to the guest frame number 
>> */
>>             gfn = paging_gva_to_gfn(current, domctl->va, &pfec);
>
> This function only works for domains that have paging assistance
> enabled (i.e. not typically dom0).   You might try using
> guest_get_eff_l1e() to find the PTE that maps domctl->va; that works
> for PV guests.  There's some code in ptwr_do_page_fault() that you
> could start with.
>
> Cheers,
>
> Tim.

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