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Commit 9e90199c authored by Xiao Guangrong's avatar Xiao Guangrong Committed by Paolo Bonzini
Browse files

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: default avatarXiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: default avatarHuaitong Han <huaitong.han@intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 17a511f8

arch/x86/include/asm/pgtable.h

+6 −0
Original line number Diff line number Diff line
@@ -107,6 +107,12 @@ static inline u32 read_pkru(void) 
	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;

arch/x86/include/asm/special_insns.h

+16 −0
Original line number Diff line number Diff line
@@ -113,11 +113,27 @@ static inline u32 __read_pkru(void) 
		     : "c" (ecx));

	return pkru;

}



static inline void __write_pkru(u32 pkru)

{

	u32 ecx = 0, edx = 0;



	/*

	 * "wrpkru" instruction.  Loads contents in EAX to PKRU,

	 * requires that ecx = edx = 0.

	 */

	asm volatile(".byte 0x0f,0x01,0xef\n\t"

		     : : "a" (pkru), "c"(ecx), "d"(edx));

}

#else

static inline u32 __read_pkru(void)

{

	return 0;

}



static inline void __write_pkru(u32 pkru)

{

}

#endif



static inline void native_wbinvd(void)