diff options
| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2019-04-03 18:41:41 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2019-04-11 15:40:58 +0200 |
| commit | c806e88734b9e9aea260bf2261c129aa23968fca (patch) | |
| tree | ef5b329aaae1af62426e37916984552757649f56 /arch/x86/include | |
| parent | x86/fpu: Use a feature number instead of mask in two more helpers (diff) | |
| download | linux-c806e88734b9e9aea260bf2261c129aa23968fca.tar.xz linux-c806e88734b9e9aea260bf2261c129aa23968fca.zip | |
x86/pkeys: Provide *pkru() helpers
Dave Hansen asked for __read_pkru() and __write_pkru() to be
symmetrical.
As part of the series __write_pkru() will read back the value and only
write it if it is different.
In order to make both functions symmetrical, move the function
containing only the opcode asm into a function called like the
instruction itself.
__write_pkru() will just invoke wrpkru() but in a follow-up patch will
also read back the value.
[ bp: Convert asm opcode wrapper names to rd/wrpkru(). ]
Suggested-by: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Juergen Gross <jgross@suse.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: kvm ML <kvm@vger.kernel.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190403164156.19645-13-bigeasy@linutronix.de
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/pgtable.h | 2 | ||||
| -rw-r--r-- | arch/x86/include/asm/special_insns.h | 12 |
2 files changed, 10 insertions, 4 deletions
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index 2779ace16d23..e8875ca75623 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -127,7 +127,7 @@ static inline int pte_dirty(pte_t pte) static inline u32 read_pkru(void) { if (boot_cpu_has(X86_FEATURE_OSPKE)) - return __read_pkru(); + return rdpkru(); return 0; } diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h index 43c029cdc3fe..34897e2b52c9 100644 --- a/arch/x86/include/asm/special_insns.h +++ b/arch/x86/include/asm/special_insns.h @@ -92,7 +92,7 @@ static inline void native_write_cr8(unsigned long val) #endif #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS -static inline u32 __read_pkru(void) +static inline u32 rdpkru(void) { u32 ecx = 0; u32 edx, pkru; @@ -107,7 +107,7 @@ static inline u32 __read_pkru(void) return pkru; } -static inline void __write_pkru(u32 pkru) +static inline void wrpkru(u32 pkru) { u32 ecx = 0, edx = 0; @@ -118,8 +118,14 @@ static inline void __write_pkru(u32 pkru) asm volatile(".byte 0x0f,0x01,0xef\n\t" : : "a" (pkru), "c"(ecx), "d"(edx)); } + +static inline void __write_pkru(u32 pkru) +{ + wrpkru(pkru); +} + #else -static inline u32 __read_pkru(void) +static inline u32 rdpkru(void) { return 0; } |