/*
|
* This file is subject to the terms and conditions of the GNU General Public
|
* License. See the file "COPYING" in the main directory of this archive
|
* for more details.
|
*
|
* KVM/MIPS: Hypercall handling.
|
*
|
* Copyright (C) 2015 Imagination Technologies Ltd.
|
*/
|
|
#include <linux/kernel.h>
|
#include <linux/kvm_host.h>
|
#include <linux/kvm_para.h>
|
|
#define MAX_HYPCALL_ARGS 4
|
|
enum emulation_result kvm_mips_emul_hypcall(struct kvm_vcpu *vcpu,
|
union mips_instruction inst)
|
{
|
unsigned int code = (inst.co_format.code >> 5) & 0x3ff;
|
|
kvm_debug("[%#lx] HYPCALL %#03x\n", vcpu->arch.pc, code);
|
|
switch (code) {
|
case 0:
|
return EMULATE_HYPERCALL;
|
default:
|
return EMULATE_FAIL;
|
};
|
}
|
|
static int kvm_mips_hypercall(struct kvm_vcpu *vcpu, unsigned long num,
|
const unsigned long *args, unsigned long *hret)
|
{
|
/* Report unimplemented hypercall to guest */
|
*hret = -KVM_ENOSYS;
|
return RESUME_GUEST;
|
}
|
|
int kvm_mips_handle_hypcall(struct kvm_vcpu *vcpu)
|
{
|
unsigned long num, args[MAX_HYPCALL_ARGS];
|
|
/* read hypcall number and arguments */
|
num = vcpu->arch.gprs[2]; /* v0 */
|
args[0] = vcpu->arch.gprs[4]; /* a0 */
|
args[1] = vcpu->arch.gprs[5]; /* a1 */
|
args[2] = vcpu->arch.gprs[6]; /* a2 */
|
args[3] = vcpu->arch.gprs[7]; /* a3 */
|
|
return kvm_mips_hypercall(vcpu, num,
|
args, &vcpu->arch.gprs[2] /* v0 */);
|
}
|
