Ping²: [PATCH] x86/PV: make post-migration page state consistent

2020-10-29 Thread Jan Beulich
On 11.09.2020 12:34, Jan Beulich wrote: > When a page table page gets de-validated, its type reference count drops > to zero (and PGT_validated gets cleared), but its type remains intact. > XEN_DOMCTL_getpageframeinfo3, therefore, so far reported prior usage for > such pages. An intermediate write

Ping: [PATCH] x86/PV: make post-migration page state consistent

2020-10-16 Thread Jan Beulich
On 11.09.2020 12:34, Jan Beulich wrote: > When a page table page gets de-validated, its type reference count drops > to zero (and PGT_validated gets cleared), but its type remains intact. > XEN_DOMCTL_getpageframeinfo3, therefore, so far reported prior usage for > such pages. An intermediate write

Re: [PATCH] x86/PV: make post-migration page state consistent

2020-09-28 Thread Jan Beulich
On 11.09.2020 14:37, Jan Beulich wrote: > On 11.09.2020 13:55, Andrew Cooper wrote: >> On 11/09/2020 11:34, Jan Beulich wrote: >>> When a page table page gets de-validated, its type reference count drops >>> to zero (and PGT_validated gets cleared), but its type remains intact. >>> XEN_DOMCTL_getpa

Re: [PATCH] x86/PV: make post-migration page state consistent

2020-09-11 Thread Andrew Cooper
On 11/09/2020 11:34, Jan Beulich wrote: > When a page table page gets de-validated, its type reference count drops > to zero (and PGT_validated gets cleared), but its type remains intact. > XEN_DOMCTL_getpageframeinfo3, therefore, so far reported prior usage for > such pages. An intermediate write

Re: [PATCH] x86/PV: make post-migration page state consistent

2020-09-11 Thread Jan Beulich
On 11.09.2020 13:55, Andrew Cooper wrote: > On 11/09/2020 11:34, Jan Beulich wrote: >> When a page table page gets de-validated, its type reference count drops >> to zero (and PGT_validated gets cleared), but its type remains intact. >> XEN_DOMCTL_getpageframeinfo3, therefore, so far reported prior

[PATCH] x86/PV: make post-migration page state consistent

2020-09-11 Thread Jan Beulich
When a page table page gets de-validated, its type reference count drops to zero (and PGT_validated gets cleared), but its type remains intact. XEN_DOMCTL_getpageframeinfo3, therefore, so far reported prior usage for such pages. An intermediate write to such a page via e.g. MMU_NORMAL_PT_UPDATE, ho