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Commit 90dfdc7c authored by David Daney's avatar David Daney Committed by Ralf Baechle
Browse files

MIPS: Add functions for hypervisor call 



Introduce kvm_hypercall[0-3].
Define three new hypercalls for MIPS: GET_CLOCK_FREQ, EXIT_VM, and
CONSOLE_OUTPUT.

[andreas.herrmann:
  * Properly define hypercalls and HC numbers for MIPS
    in kvm_para.h header files]

Signed-off-by: default avatarDavid Daney <david.daney@cavium.com>
Signed-off-by: default avatarAndreas Herrmann <andreas.herrmann@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Cc: James Hogan <james.hogan@imgtec.com>
Cc: kvm@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7005/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent cd3f5389

arch/mips/include/asm/kvm_para.h

0 → 100644
+109 −0
Original line number Diff line number Diff line 
#ifndef _ASM_MIPS_KVM_PARA_H

#define _ASM_MIPS_KVM_PARA_H



#include <uapi/asm/kvm_para.h>



#define KVM_HYPERCALL ".word 0x42000028"



/*

 * Hypercalls for KVM.

 *

 * Hypercall number is passed in v0.

 * Return value will be placed in v0.

 * Up to 3 arguments are passed in a0, a1, and a2.

 */

static inline unsigned long kvm_hypercall0(unsigned long num)

{

	register unsigned long n asm("v0");

	register unsigned long r asm("v0");



	n = num;

	__asm__ __volatile__(

		KVM_HYPERCALL

		: "=r" (r) : "r" (n) : "memory"

		);



	return r;

}



static inline unsigned long kvm_hypercall1(unsigned long num,

					unsigned long arg0)

{

	register unsigned long n asm("v0");

	register unsigned long r asm("v0");

	register unsigned long a0 asm("a0");



	n = num;

	a0 = arg0;

	__asm__ __volatile__(

		KVM_HYPERCALL

		: "=r" (r) : "r" (n), "r" (a0) : "memory"

		);



	return r;

}



static inline unsigned long kvm_hypercall2(unsigned long num,

					unsigned long arg0, unsigned long arg1)

{

	register unsigned long n asm("v0");

	register unsigned long r asm("v0");

	register unsigned long a0 asm("a0");

	register unsigned long a1 asm("a1");



	n = num;

	a0 = arg0;

	a1 = arg1;

	__asm__ __volatile__(

		KVM_HYPERCALL

		: "=r" (r) : "r" (n), "r" (a0), "r" (a1) : "memory"

		);



	return r;

}



static inline unsigned long kvm_hypercall3(unsigned long num,

	unsigned long arg0, unsigned long arg1, unsigned long arg2)

{

	register unsigned long n asm("v0");

	register unsigned long r asm("v0");

	register unsigned long a0 asm("a0");

	register unsigned long a1 asm("a1");

	register unsigned long a2 asm("a2");



	n = num;

	a0 = arg0;

	a1 = arg1;

	a2 = arg2;

	__asm__ __volatile__(

		KVM_HYPERCALL

		: "=r" (r) : "r" (n), "r" (a0), "r" (a1), "r" (a2) : "memory"

		);



	return r;

}



static inline bool kvm_check_and_clear_guest_paused(void)

{

	return false;

}



static inline unsigned int kvm_arch_para_features(void)

{

	return 0;

}



#ifdef CONFIG_MIPS_PARAVIRT

static inline bool kvm_para_available(void)

{

	return true;

}

#else

static inline bool kvm_para_available(void)

{

	return false;

}

#endif





#endif /* _ASM_MIPS_KVM_PARA_H */

arch/mips/include/uapi/asm/kvm_para.h

+5 −1
Original line number Diff line number Diff line 
#include <asm-generic/kvm_para.h>
 
#ifndef _UAPI_ASM_MIPS_KVM_PARA_H

#define _UAPI_ASM_MIPS_KVM_PARA_H





#endif /* _UAPI_ASM_MIPS_KVM_PARA_H */

include/uapi/linux/kvm_para.h

+3 −0
Original line number Diff line number Diff line
@@ -20,6 +20,9 @@ 
#define KVM_HC_FEATURES			3

#define KVM_HC_PPC_MAP_MAGIC_PAGE	4

#define KVM_HC_KICK_CPU			5

#define KVM_HC_MIPS_GET_CLOCK_FREQ	6

#define KVM_HC_MIPS_EXIT_VM		7

#define KVM_HC_MIPS_CONSOLE_OUTPUT	8



/*

 * hypercalls use architecture specific