Re: [Xen-devel] [PATCH RFC v2 07/12] x86: allow per-domain mappings without NX bit or with specific mfn

>>> On 22.01.18 at 13:32, wrote: > For support of per-vcpu stacks we need per-vcpu trampolines. To be > able to put those into the per-domain mappings the upper levels > page tables must not have NX set for per-domain mappings. > > In order to be able to reset the NX bit for a

Re: [Xen-devel] [PATCH RFC v2 07/12] x86: allow per-domain mappings without NX bit or with specific mfn

>>> On 30.01.18 at 09:02, wrote: > On 29/01/18 18:06, Jan Beulich wrote: > On 22.01.18 at 13:32, wrote: >>> --- a/xen/arch/x86/mm.c >>> +++ b/xen/arch/x86/mm.c >>> @@ -1568,7 +1568,7 @@ void init_xen_l4_slots(l4_pgentry_t *l4t, mfn_t l4mfn, >>> >>> /*

Re: [Xen-devel] [PATCH RFC v2 07/12] x86: allow per-domain mappings without NX bit or with specific mfn

On 29/01/18 18:06, Jan Beulich wrote: On 22.01.18 at 13:32, wrote: >> --- a/xen/arch/x86/mm.c >> +++ b/xen/arch/x86/mm.c >> @@ -1568,7 +1568,7 @@ void init_xen_l4_slots(l4_pgentry_t *l4t, mfn_t l4mfn, >> >> /* Slot 260: Per-domain mappings (if applicable). */ >>

Re: [Xen-devel] [PATCH RFC v2 07/12] x86: allow per-domain mappings without NX bit or with specific mfn

>>> On 22.01.18 at 13:32, wrote: > --- a/xen/arch/x86/mm.c > +++ b/xen/arch/x86/mm.c > @@ -1568,7 +1568,7 @@ void init_xen_l4_slots(l4_pgentry_t *l4t, mfn_t l4mfn, > > /* Slot 260: Per-domain mappings (if applicable). */ > l4t[l4_table_offset(PERDOMAIN_VIRT_START)] =

[Xen-devel] [PATCH RFC v2 07/12] x86: allow per-domain mappings without NX bit or with specific mfn

For support of per-vcpu stacks we need per-vcpu trampolines. To be able to put those into the per-domain mappings the upper levels page tables must not have NX set for per-domain mappings. In order to be able to reset the NX bit for a per-domain mapping add a helper flipflags_perdomain_mapping()