x86: pkey: introduce write_pkru() for KVM
KVM will use it to switch pkru between guest and host.
CC: Ingo Molnar <mingo@redhat.com>
CC: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Huaitong Han <huaitong.han@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 1ff49ec..97f3242 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -107,6 +107,12 @@
return 0;
}
+static inline void write_pkru(u32 pkru)
+{
+ if (boot_cpu_has(X86_FEATURE_OSPKE))
+ __write_pkru(pkru);
+}
+
static inline int pte_young(pte_t pte)
{
return pte_flags(pte) & _PAGE_ACCESSED;