Re: [Xen-devel] Fwd: Question regarding the behavior of guest_physmap_remove_page on x86

2015-11-18 Thread Julien Grall
Hi Andrew, On 17/11/15 18:47, Andrew Cooper wrote: > On 17/11/15 18:09, Julien Grall wrote: >> On ARM, it's possible to fail when removing a page from the P2M. It's >> happening if we are trying to shatter a superpage and we don't have >> memory to allocate the table. Therefore the mapping won't b

Re: [Xen-devel] Fwd: Question regarding the behavior of guest_physmap_remove_page on x86

2015-11-17 Thread Andrew Cooper
On 17/11/15 18:09, Julien Grall wrote: > (Resending with this time xen-devel in CC) > > Hi, > > On ARM, it's possible to fail when removing a page from the P2M. It's > happening if we are trying to shatter a superpage and we don't have > memory to allocate the table. Therefore the mapping won't be

[Xen-devel] Fwd: Question regarding the behavior of guest_physmap_remove_page on x86

2015-11-17 Thread Julien Grall
(Resending with this time xen-devel in CC) Hi, On ARM, it's possible to fail when removing a page from the P2M. It's happening if we are trying to shatter a superpage and we don't have memory to allocate the table. Therefore the mapping won't be removed from the P2M. However on ARM (and until re