Commit 2a342ed5 authored by Alexander Graf's avatar Alexander Graf Committed by Avi Kivity
Browse files

KVM: PPC: Implement hypervisor interface 



To communicate with KVM directly we need to plumb some sort of interface
between the guest and KVM. Usually those interfaces use hypercalls.

This hypercall implementation is described in the last patch of the series
in a special documentation file. Please read that for further information.

This patch implements stubs to handle KVM PPC hypercalls on the host and
guest side alike.

Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent a73a9599

arch/powerpc/include/asm/kvm_para.h

+113 −1
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
#define __POWERPC_KVM_PARA_H__



#include <linux/types.h>

#include <linux/of.h>



struct kvm_vcpu_arch_shared {

	__u64 sprg0;
@@ -34,16 +35,127 @@ struct kvm_vcpu_arch_shared { 
	__u32 dsisr;

};



#define KVM_SC_MAGIC_R0		0x4b564d21 /* "KVM!" */

#define HC_VENDOR_KVM		(42 << 16)

#define HC_EV_SUCCESS		0

#define HC_EV_UNIMPLEMENTED	12



#ifdef __KERNEL__



#ifdef CONFIG_KVM_GUEST



static inline int kvm_para_available(void)

{

	struct device_node *hyper_node;



	hyper_node = of_find_node_by_path("/hypervisor");

	if (!hyper_node)

		return 0;



	if (!of_device_is_compatible(hyper_node, "linux,kvm"))

		return 0;



	return 1;

}



extern unsigned long kvm_hypercall(unsigned long *in,

				   unsigned long *out,

				   unsigned long nr);



#else



static inline int kvm_para_available(void)

{

	return 0;

}



static unsigned long kvm_hypercall(unsigned long *in,

				   unsigned long *out,

				   unsigned long nr)

{

	return HC_EV_UNIMPLEMENTED;

}



#endif



static inline long kvm_hypercall0_1(unsigned int nr, unsigned long *r2)

{

	unsigned long in[8];

	unsigned long out[8];

	unsigned long r;



	r = kvm_hypercall(in, out, nr | HC_VENDOR_KVM);

	*r2 = out[0];



	return r;

}



static inline long kvm_hypercall0(unsigned int nr)

{

	unsigned long in[8];

	unsigned long out[8];



	return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);

}



static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)

{

	unsigned long in[8];

	unsigned long out[8];



	in[0] = p1;

	return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);

}



static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,

				  unsigned long p2)

{

	unsigned long in[8];

	unsigned long out[8];



	in[0] = p1;

	in[1] = p2;

	return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);

}



static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,

				  unsigned long p2, unsigned long p3)

{

	unsigned long in[8];

	unsigned long out[8];



	in[0] = p1;

	in[1] = p2;

	in[2] = p3;

	return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);

}



static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,

				  unsigned long p2, unsigned long p3,

				  unsigned long p4)

{

	unsigned long in[8];

	unsigned long out[8];



	in[0] = p1;

	in[1] = p2;

	in[2] = p3;

	in[3] = p4;

	return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);

}





static inline unsigned int kvm_arch_para_features(void)

{

	unsigned long r;



	if (!kvm_para_available())

		return 0;



	if(kvm_hypercall0_1(KVM_HC_FEATURES, &r))

		return 0;



	return r;

}



#endif /* __KERNEL__ */

arch/powerpc/include/asm/kvm_ppc.h

+1 −0
Original line number Diff line number Diff line
@@ -107,6 +107,7 @@ extern int kvmppc_booke_init(void); 
extern void kvmppc_booke_exit(void);



extern void kvmppc_core_destroy_mmu(struct kvm_vcpu *vcpu);

extern int kvmppc_kvm_pv(struct kvm_vcpu *vcpu);



/*

 * Cuts out inst bits with ordering according to spec.

arch/powerpc/kernel/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -127,6 +127,8 @@ ifneq ($(CONFIG_XMON)$(CONFIG_KEXEC),) 
obj-y				+= ppc_save_regs.o

endif



obj-$(CONFIG_KVM_GUEST)		+= kvm.o



# Disable GCOV in odd or sensitive code

GCOV_PROFILE_prom_init.o := n

GCOV_PROFILE_ftrace.o := n

arch/powerpc/kernel/kvm.c

0 → 100644
+68 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.

 *

 * Authors:

 *     Alexander Graf <agraf@suse.de>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License, version 2, as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

 */



#include <linux/kvm_host.h>

#include <linux/init.h>

#include <linux/kvm_para.h>

#include <linux/slab.h>

#include <linux/of.h>



#include <asm/reg.h>

#include <asm/kvm_ppc.h>

#include <asm/sections.h>

#include <asm/cacheflush.h>

#include <asm/disassemble.h>



unsigned long kvm_hypercall(unsigned long *in,

			    unsigned long *out,

			    unsigned long nr)

{

	unsigned long register r0 asm("r0");

	unsigned long register r3 asm("r3") = in[0];

	unsigned long register r4 asm("r4") = in[1];

	unsigned long register r5 asm("r5") = in[2];

	unsigned long register r6 asm("r6") = in[3];

	unsigned long register r7 asm("r7") = in[4];

	unsigned long register r8 asm("r8") = in[5];

	unsigned long register r9 asm("r9") = in[6];

	unsigned long register r10 asm("r10") = in[7];

	unsigned long register r11 asm("r11") = nr;

	unsigned long register r12 asm("r12");



	asm volatile("bl	kvm_hypercall_start"

		     : "=r"(r0), "=r"(r3), "=r"(r4), "=r"(r5), "=r"(r6),

		       "=r"(r7), "=r"(r8), "=r"(r9), "=r"(r10), "=r"(r11),

		       "=r"(r12)

		     : "r"(r3), "r"(r4), "r"(r5), "r"(r6), "r"(r7), "r"(r8),

		       "r"(r9), "r"(r10), "r"(r11)

		     : "memory", "cc", "xer", "ctr", "lr");



	out[0] = r4;

	out[1] = r5;

	out[2] = r6;

	out[3] = r7;

	out[4] = r8;

	out[5] = r9;

	out[6] = r10;

	out[7] = r11;



	return r3;

}

EXPORT_SYMBOL_GPL(kvm_hypercall);

arch/powerpc/kvm/book3s.c

+7 −2
Original line number Diff line number Diff line
@@ -947,10 +947,10 @@ program_interrupt: 
		break;

	}

	case BOOK3S_INTERRUPT_SYSCALL:

		// XXX make user settable

		if (vcpu->arch.osi_enabled &&

		    (((u32)kvmppc_get_gpr(vcpu, 3)) == OSI_SC_MAGIC_R3) &&

		    (((u32)kvmppc_get_gpr(vcpu, 4)) == OSI_SC_MAGIC_R4)) {

			/* MOL hypercalls */

			u64 *gprs = run->osi.gprs;

			int i;
@@ -959,8 +959,13 @@ program_interrupt: 
				gprs[i] = kvmppc_get_gpr(vcpu, i);

			vcpu->arch.osi_needed = 1;

			r = RESUME_HOST_NV;



		} else if (!(vcpu->arch.shared->msr & MSR_PR) &&

		    (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {

			/* KVM PV hypercalls */

			kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));

			r = RESUME_GUEST;

		} else {

			/* Guest syscalls */

			vcpu->stat.syscall_exits++;

			kvmppc_book3s_queue_irqprio(vcpu, exit_nr);

			r = RESUME_GUEST;

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