[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [V2 PATCH 5/9] x86/hvm: pkeys, add functions to get pkeys value from PTE
This patch adds functions to get pkeys value from PTE. Signed-off-by: Huaitong Han <huaitong.han@xxxxxxxxx> --- xen/include/asm-x86/guest_pt.h | 7 +++++++ xen/include/asm-x86/page.h | 5 +++++ xen/include/asm-x86/x86_64/page.h | 19 +++++++++++++++++++ 3 files changed, 31 insertions(+) diff --git a/xen/include/asm-x86/guest_pt.h b/xen/include/asm-x86/guest_pt.h index 3447973..6b0af70 100644 --- a/xen/include/asm-x86/guest_pt.h +++ b/xen/include/asm-x86/guest_pt.h @@ -154,6 +154,13 @@ static inline u32 guest_l4e_get_flags(guest_l4e_t gl4e) { return l4e_get_flags(gl4e); } #endif +static inline u32 guest_l1e_get_pkeys(guest_l1e_t gl1e) +{ return l1e_get_pkeys(gl1e); } +static inline u32 guest_l2e_get_pkeys(guest_l2e_t gl2e) +{ return l2e_get_pkeys(gl2e); } +static inline u32 guest_l3e_get_pkeys(guest_l3e_t gl3e) +{ return l3e_get_pkeys(gl3e); } + static inline guest_l1e_t guest_l1e_from_gfn(gfn_t gfn, u32 flags) { return l1e_from_pfn(gfn_x(gfn), flags); } static inline guest_l2e_t guest_l2e_from_gfn(gfn_t gfn, u32 flags) diff --git a/xen/include/asm-x86/page.h b/xen/include/asm-x86/page.h index a095a93..93a0db0 100644 --- a/xen/include/asm-x86/page.h +++ b/xen/include/asm-x86/page.h @@ -93,6 +93,11 @@ #define l3e_get_flags(x) (get_pte_flags((x).l3)) #define l4e_get_flags(x) (get_pte_flags((x).l4)) +/* Get pte pkeys (unsigned int). */ +#define l1e_get_pkeys(x) (get_pte_pkeys((x).l1)) +#define l2e_get_pkeys(x) (get_pte_pkeys((x).l2)) +#define l3e_get_pkeys(x) (get_pte_pkeys((x).l3)) + /* Construct an empty pte. */ #define l1e_empty() ((l1_pgentry_t) { 0 }) #define l2e_empty() ((l2_pgentry_t) { 0 }) diff --git a/xen/include/asm-x86/x86_64/page.h b/xen/include/asm-x86/x86_64/page.h index 19ab4d0..49343ec 100644 --- a/xen/include/asm-x86/x86_64/page.h +++ b/xen/include/asm-x86/x86_64/page.h @@ -134,6 +134,25 @@ typedef l4_pgentry_t root_pgentry_t; #define get_pte_flags(x) (((int)((x) >> 40) & ~0xFFF) | ((int)(x) & 0xFFF)) #define put_pte_flags(x) (((intpte_t)((x) & ~0xFFF) << 40) | ((x) & 0xFFF)) +/* + * Protection keys define a new 4-bit protection key field + * (PKEY) in bits 62:59 of leaf entries of the page tables. + * This corresponds to bit 22:19 of a 24-bit flags. + * + * Notice: Bit 22 is used by _PAGE_GNTTAB which is visible to PV guests, + * so Protection keys must be disabled on PV guests. + */ +#define _PAGE_PKEY_BIT0 (1u<<19) /* Protection Keys, bit 1/4 */ +#define _PAGE_PKEY_BIT1 (1u<<20) /* Protection Keys, bit 2/4 */ +#define _PAGE_PKEY_BIT2 (1u<<21) /* Protection Keys, bit 3/4 */ +#define _PAGE_PKEY_BIT3 (1u<<22) /* Protection Keys, bit 4/4 */ + +/* The order of mask _PAGE_PKEY_BIT0 is 19 */ +#define get_pte_pkeys(x) ((int)(get_pte_flags(x) >> 19) & 0xF) + +/* Take pkey first bit as pkey feature */ +#define _PAGE_PKEY_BIT _PAGE_PKEY_BIT0 + /* Bit 23 of a 24-bit flag mask. This corresponds to bit 63 of a pte.*/ #define _PAGE_NX_BIT (1U<<23) -- 2.4.3 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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