diff options
Diffstat (limited to 'include/xen')
| -rw-r--r-- | include/xen/interface/features.h | 3 | ||||
| -rw-r--r-- | include/xen/interface/xen.h | 9 |
2 files changed, 10 insertions, 2 deletions
diff --git a/include/xen/interface/features.h b/include/xen/interface/features.h index d73228d16488..f51b6413b054 100644 --- a/include/xen/interface/features.h +++ b/include/xen/interface/features.h @@ -38,6 +38,9 @@ */ #define XENFEAT_pae_pgdir_above_4gb 4 +/* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */ +#define XENFEAT_mmu_pt_update_preserve_ad 5 + #define XENFEAT_NR_SUBMAPS 1 #endif /* __XEN_PUBLIC_FEATURES_H__ */ diff --git a/include/xen/interface/xen.h b/include/xen/interface/xen.h index 819a0331cda9..2befa3e2f1bc 100644 --- a/include/xen/interface/xen.h +++ b/include/xen/interface/xen.h @@ -114,9 +114,14 @@ * ptr[:2] -- Machine address within the frame whose mapping to modify. * The frame must belong to the FD, if one is specified. * val -- Value to write into the mapping entry. + * + * ptr[1:0] == MMU_PT_UPDATE_PRESERVE_AD: + * As MMU_NORMAL_PT_UPDATE above, but A/D bits currently in the PTE are ORed + * with those in @val. */ -#define MMU_NORMAL_PT_UPDATE 0 /* checked '*ptr = val'. ptr is MA. */ -#define MMU_MACHPHYS_UPDATE 1 /* ptr = MA of frame to modify entry for */ +#define MMU_NORMAL_PT_UPDATE 0 /* checked '*ptr = val'. ptr is MA. */ +#define MMU_MACHPHYS_UPDATE 1 /* ptr = MA of frame to modify entry for */ +#define MMU_PT_UPDATE_PRESERVE_AD 2 /* atomically: *ptr = val | (*ptr&(A|D)) */ /* * MMU EXTENDED OPERATIONS |