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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svm_vmcall_test.c (1577B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * svm_vmcall_test
      4 *
      5 * Copyright (C) 2020, Red Hat, Inc.
      6 *
      7 * Nested SVM testing: VMCALL
      8 */
      9
     10#include "test_util.h"
     11#include "kvm_util.h"
     12#include "processor.h"
     13#include "svm_util.h"
     14
     15#define VCPU_ID		5
     16
     17static struct kvm_vm *vm;
     18
     19static void l2_guest_code(struct svm_test_data *svm)
     20{
     21	__asm__ __volatile__("vmcall");
     22}
     23
     24static void l1_guest_code(struct svm_test_data *svm)
     25{
     26	#define L2_GUEST_STACK_SIZE 64
     27	unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
     28	struct vmcb *vmcb = svm->vmcb;
     29
     30	/* Prepare for L2 execution. */
     31	generic_svm_setup(svm, l2_guest_code,
     32			  &l2_guest_stack[L2_GUEST_STACK_SIZE]);
     33
     34	run_guest(vmcb, svm->vmcb_gpa);
     35
     36	GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
     37	GUEST_DONE();
     38}
     39
     40int main(int argc, char *argv[])
     41{
     42	vm_vaddr_t svm_gva;
     43
     44	nested_svm_check_supported();
     45
     46	vm = vm_create_default(VCPU_ID, 0, (void *) l1_guest_code);
     47
     48	vcpu_alloc_svm(vm, &svm_gva);
     49	vcpu_args_set(vm, VCPU_ID, 1, svm_gva);
     50
     51	for (;;) {
     52		volatile struct kvm_run *run = vcpu_state(vm, VCPU_ID);
     53		struct ucall uc;
     54
     55		vcpu_run(vm, VCPU_ID);
     56		TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
     57			    "Got exit_reason other than KVM_EXIT_IO: %u (%s)\n",
     58			    run->exit_reason,
     59			    exit_reason_str(run->exit_reason));
     60
     61		switch (get_ucall(vm, VCPU_ID, &uc)) {
     62		case UCALL_ABORT:
     63			TEST_FAIL("%s", (const char *)uc.args[0]);
     64			/* NOT REACHED */
     65		case UCALL_SYNC:
     66			break;
     67		case UCALL_DONE:
     68			goto done;
     69		default:
     70			TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd);
     71		}
     72	}
     73done:
     74	kvm_vm_free(vm);
     75	return 0;
     76}