From: Sebastian Andrzej Siewior bigeasy@linutronix.de
mainline inclusion from mainline-v5.2-rc1 commit c806e88734b9e9aea260bf2261c129aa23968fca category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I4MKP4 CVE: NA
--------------------------------
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 Signed-off-by: Jackie Liu liuyun01@kylinos.cn #openEuler_contributor Signed-off-by: Laibin Qiu qiulaibin@huawei.com --- arch/x86/include/asm/pgtable.h | 2 +- arch/x86/include/asm/special_insns.h | 12 +++++++++--- arch/x86/kvm/vmx.c | 2 +- 3 files changed, 11 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index 6f4bc1d890d0..fe6f9e7f15bb 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -128,7 +128,7 @@ 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 317fc59b512c..cddf923d405c 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; } diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index b8fceac285f6..aa0045ce56ea 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -10989,7 +10989,7 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) */ if (static_cpu_has(X86_FEATURE_PKU) && kvm_read_cr4_bits(vcpu, X86_CR4_PKE)) { - vcpu->arch.pkru = __read_pkru(); + vcpu->arch.pkru = rdpkru(); if (vcpu->arch.pkru != vmx->host_pkru) __write_pkru(vmx->host_pkru); }