[thirdparty/kernel/stable.git] / tools / testing / selftests / kvm / lib / riscv / ucall.c

// SPDX-License-Identifier: GPL-2.0
/*
 * ucall support. A ucall is a "hypercall to userspace".
 *
 * Copyright (C) 2021 Western Digital Corporation or its affiliates.
 */

#include <linux/kvm.h>

#include "kvm_util.h"
#include "processor.h"

void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu)
{
	struct kvm_run *run = vcpu->run;

	if (run->exit_reason == KVM_EXIT_RISCV_SBI &&
	    run->riscv_sbi.extension_id == KVM_RISCV_SELFTESTS_SBI_EXT) {
		switch (run->riscv_sbi.function_id) {
		case KVM_RISCV_SELFTESTS_SBI_UCALL:
			return (void *)run->riscv_sbi.args[0];
		case KVM_RISCV_SELFTESTS_SBI_UNEXP:
			vcpu_dump(stderr, vcpu, 2);
			TEST_ASSERT(0, "Unexpected trap taken by guest");
			break;
		default:
			break;
		}
	}
	return NULL;
}
Commit	Line	Data
3e06cdf1 AP	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* ucall support. A ucall is a "hypercall to userspace".
	4	*
	5	* Copyright (C) 2021 Western Digital Corporation or its affiliates.
	6	*/
	7
	8	#include <linux/kvm.h>
	9
	10	#include "kvm_util.h"
3e06cdf1 AP	11	#include "processor.h"
3e06cdf1 AP	12
ef38871e	13	void ucall_arch_get_ucall(struct kvm_vcpu vcpu)
3e06cdf1	14	{
768e9a61	15	struct kvm_run *run = vcpu->run;
3e06cdf1 AP	16
3e06cdf1 AP	17	if (run->exit_reason == KVM_EXIT_RISCV_SBI &&
ac6c85e9 AP	18	run->riscv_sbi.extension_id == KVM_RISCV_SELFTESTS_SBI_EXT) {
	19	switch (run->riscv_sbi.function_id) {
	20	case KVM_RISCV_SELFTESTS_SBI_UCALL:
426729b2	21	return (void *)run->riscv_sbi.args[0];
ac6c85e9	22	case KVM_RISCV_SELFTESTS_SBI_UNEXP:
768e9a61	23	vcpu_dump(stderr, vcpu, 2);
ac6c85e9 AP	24	TEST_ASSERT(0, "Unexpected trap taken by guest");
	25	break;
	26	default:
	27	break;
	28	}
3e06cdf1	29	}
ef38871e	30	return NULL;
3e06cdf1	31	}