cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hypcall.c (1347B)

      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
     17enum 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
     32static 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
     40int 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}