tools/testing/selftests/kvm/arm64/external_aborts.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/kvm/arm64/external_aborts.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/kvm/arm64/external_aborts.c
Extension
.c
Size
9975 bytes
Lines
416
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * external_abort - Tests for userspace external abort injection
 *
 * Copyright (c) 2024 Google LLC
 */
#include "processor.h"
#include "test_util.h"

#define MMIO_ADDR		0x8000000ULL
#define EXPECTED_SERROR_ISS	(ESR_ELx_ISV | 0x1d1ed)

static u64 expected_abort_pc;

static void expect_sea_handler(struct ex_regs *regs)
{
	u64 esr = read_sysreg(esr_el1);

	GUEST_ASSERT_EQ(regs->pc, expected_abort_pc);
	GUEST_ASSERT_EQ(ESR_ELx_EC(esr), ESR_ELx_EC_DABT_CUR);
	GUEST_ASSERT_EQ(esr & ESR_ELx_FSC_TYPE, ESR_ELx_FSC_EXTABT);

	GUEST_DONE();
}

static void unexpected_dabt_handler(struct ex_regs *regs)
{
	GUEST_FAIL("Unexpected data abort at PC: %lx\n", regs->pc);
}

static struct kvm_vm *vm_create_with_dabt_handler(struct kvm_vcpu **vcpu, void *guest_code,
						  handler_fn dabt_handler)
{
	struct kvm_vm *vm = vm_create_with_one_vcpu(vcpu, guest_code);

	vm_init_descriptor_tables(vm);
	vcpu_init_descriptor_tables(*vcpu);
	vm_install_sync_handler(vm, VECTOR_SYNC_CURRENT, ESR_ELx_EC_DABT_CUR, dabt_handler);

	virt_map(vm, MMIO_ADDR, MMIO_ADDR, 1);

	return vm;
}

static void vcpu_inject_sea(struct kvm_vcpu *vcpu)
{
	struct kvm_vcpu_events events = {};

	events.exception.ext_dabt_pending = true;
	vcpu_events_set(vcpu, &events);
}

static bool vcpu_has_ras(struct kvm_vcpu *vcpu)
{
	u64 pfr0 = vcpu_get_reg(vcpu, KVM_ARM64_SYS_REG(SYS_ID_AA64PFR0_EL1));

	return SYS_FIELD_GET(ID_AA64PFR0_EL1, RAS, pfr0);
}

static bool guest_has_ras(void)
{
	return SYS_FIELD_GET(ID_AA64PFR0_EL1, RAS, read_sysreg(id_aa64pfr0_el1));
}

static void vcpu_inject_serror(struct kvm_vcpu *vcpu)
{
	struct kvm_vcpu_events events = {};

	events.exception.serror_pending = true;
	if (vcpu_has_ras(vcpu)) {
		events.exception.serror_has_esr = true;
		events.exception.serror_esr = EXPECTED_SERROR_ISS;
	}

	vcpu_events_set(vcpu, &events);
}

static void __vcpu_run_expect(struct kvm_vcpu *vcpu, unsigned int cmd)
{
	struct ucall uc;

	vcpu_run(vcpu);
	switch (get_ucall(vcpu, &uc)) {
	case UCALL_ABORT:
		REPORT_GUEST_ASSERT(uc);
		break;
	default:
		if (uc.cmd == cmd)
			return;

Annotation

Implementation Notes