2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * KVM/MIPS: Hypercall handling.
8 * Copyright (C) 2015 Imagination Technologies Ltd.
11 #include <linux/kernel.h>
12 #include <linux/kvm_host.h>
13 #include <linux/kvm_para.h>
15 #define MAX_HYPCALL_ARGS 4
17 enum emulation_result kvm_mips_emul_hypcall(struct kvm_vcpu *vcpu,
18 union mips_instruction inst)
20 unsigned int code = (inst.co_format.code >> 5) & 0x3ff;
22 kvm_debug("[%#lx] HYPCALL %#03x\n", vcpu->arch.pc, code);
26 return EMULATE_HYPERCALL;
32 static int kvm_mips_hypercall(struct kvm_vcpu *vcpu, unsigned long num,
33 const unsigned long *args, unsigned long *hret)
35 /* Report unimplemented hypercall to guest */
40 int kvm_mips_handle_hypcall(struct kvm_vcpu *vcpu)
42 unsigned long num, args[MAX_HYPCALL_ARGS];
44 /* read hypcall number and arguments */
45 num = vcpu->arch.gprs[2]; /* v0 */
46 args[0] = vcpu->arch.gprs[4]; /* a0 */
47 args[1] = vcpu->arch.gprs[5]; /* a1 */
48 args[2] = vcpu->arch.gprs[6]; /* a2 */
49 args[3] = vcpu->arch.gprs[7]; /* a3 */
51 return kvm_mips_hypercall(vcpu, num,
52 args, &vcpu->arch.gprs[2] /* v0 */);