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Linux/arch/mips/kvm/hypcall.c

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  1 /*
  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
  4  * for more details.
  5  *
  6  * KVM/MIPS: Hypercall handling.
  7  *
  8  * Copyright (C) 2015  Imagination Technologies Ltd.
  9  */
 10 
 11 #include <linux/kernel.h>
 12 #include <linux/kvm_host.h>
 13 #include <linux/kvm_para.h>
 14 
 15 #define MAX_HYPCALL_ARGS        4
 16 
 17 enum emulation_result kvm_mips_emul_hypcall(struct kvm_vcpu *vcpu,
 18                                             union mips_instruction inst)
 19 {
 20         unsigned int code = (inst.co_format.code >> 5) & 0x3ff;
 21 
 22         kvm_debug("[%#lx] HYPCALL %#03x\n", vcpu->arch.pc, code);
 23 
 24         switch (code) {
 25         case 0:
 26                 return EMULATE_HYPERCALL;
 27         default:
 28                 return EMULATE_FAIL;
 29         };
 30 }
 31 
 32 static int kvm_mips_hypercall(struct kvm_vcpu *vcpu, unsigned long num,
 33                               const unsigned long *args, unsigned long *hret)
 34 {
 35         /* Report unimplemented hypercall to guest */
 36         *hret = -KVM_ENOSYS;
 37         return RESUME_GUEST;
 38 }
 39 
 40 int kvm_mips_handle_hypcall(struct kvm_vcpu *vcpu)
 41 {
 42         unsigned long num, args[MAX_HYPCALL_ARGS];
 43 
 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 */
 50 
 51         return kvm_mips_hypercall(vcpu, num,
 52                                   args, &vcpu->arch.gprs[2] /* v0 */);
 53 }
 54 

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