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KVM: selftests: aarch64: Add tests for IRQFD in vgic_irq

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Add injection tests for the KVM_IRQFD ioctl into vgic_irq.

Signed-off-by: Ricardo Koller <ricarkol@google.com>
Acked-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211109023906.1091208-16-ricarkol@google.com
This commit is contained in:
Ricardo Koller 2021-11-08 18:39:04 -08:00 committed by Marc Zyngier
parent 88209c104e
commit 6a5a47188c
2 changed files with 102 additions and 1 deletions
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101
tools/testing/selftests/kvm/aarch64/vgic_irq.c
View File

@ -10,6 +10,7 @@
#include <asm/kvm.h>
#include <asm/kvm_para.h>
#include <sys/eventfd.h>
#include <linux/sizes.h>
#include "processor.h"
@ -31,6 +32,8 @@ struct test_args {
uint32_t nr_irqs; /* number of KVM supported IRQs. */
bool eoi_split; /* 1 is eoir+dir, 0 is eoir only */
bool level_sensitive; /* 1 is level, 0 is edge */
int kvm_max_routes; /* output of KVM_CAP_IRQ_ROUTING */
bool kvm_supports_irqfd; /* output of KVM_CAP_IRQFD */
};
/*
@ -61,6 +64,7 @@ typedef enum {
KVM_SET_IRQ_LINE,
KVM_SET_IRQ_LINE_HIGH,
KVM_SET_LEVEL_INFO_HIGH,
KVM_INJECT_IRQFD,
} kvm_inject_cmd;
struct kvm_inject_args {
@ -100,6 +104,7 @@ struct kvm_inject_desc {
static struct kvm_inject_desc inject_edge_fns[] = {
/* sgi ppi spi */
{ KVM_INJECT_EDGE_IRQ_LINE, false, false, true },
{ KVM_INJECT_IRQFD, false, false, true },
{ 0, },
};
@ -107,12 +112,17 @@ static struct kvm_inject_desc inject_level_fns[] = {
/* sgi ppi spi */
{ KVM_SET_IRQ_LINE_HIGH, false, true, true },
{ KVM_SET_LEVEL_INFO_HIGH, false, true, true },
{ KVM_INJECT_IRQFD, false, false, true },
{ 0, },
};
#define for_each_inject_fn(t, f) \
for ((f) = (t); (f)->cmd; (f)++)
#define for_each_supported_inject_fn(args, t, f) \
for_each_inject_fn(t, f) \
if ((args)->kvm_supports_irqfd || (f)->cmd != KVM_INJECT_IRQFD)
/* Shared between the guest main thread and the IRQ handlers. */
volatile uint64_t irq_handled;
volatile uint32_t irqnr_received[MAX_SPI + 1];
@ -403,7 +413,7 @@ static void guest_code(struct test_args args)
local_irq_enable();
/* Start the tests. */
for_each_inject_fn(inject_fns, f) {
for_each_supported_inject_fn(&args, inject_fns, f) {
test_injection(&args, f);
test_preemption(&args, f);
test_injection_failure(&args, f);
@ -455,6 +465,88 @@ void kvm_irq_set_level_info_check(int gic_fd, uint32_t intid, int level,
}
}
static void kvm_set_gsi_routing_irqchip_check(struct kvm_vm *vm,
uint32_t intid, uint32_t num, uint32_t kvm_max_routes,
bool expect_failure)
{
struct kvm_irq_routing *routing;
int ret;
uint64_t i;
assert(num <= kvm_max_routes && kvm_max_routes <= KVM_MAX_IRQ_ROUTES);
routing = kvm_gsi_routing_create();
for (i = intid; i < (uint64_t)intid + num; i++)
kvm_gsi_routing_irqchip_add(routing, i - MIN_SPI, i - MIN_SPI);
if (!expect_failure) {
kvm_gsi_routing_write(vm, routing);
} else {
ret = _kvm_gsi_routing_write(vm, routing);
/* The kernel only checks for KVM_IRQCHIP_NUM_PINS. */
if (intid >= KVM_IRQCHIP_NUM_PINS)
TEST_ASSERT(ret != 0 && errno == EINVAL,
"Bad intid %u did not cause KVM_SET_GSI_ROUTING "
"error: rc: %i errno: %i", intid, ret, errno);
else
TEST_ASSERT(ret == 0, "KVM_SET_GSI_ROUTING "
"for intid %i failed, rc: %i errno: %i",
intid, ret, errno);
}
}
static void kvm_routing_and_irqfd_check(struct kvm_vm *vm,
uint32_t intid, uint32_t num, uint32_t kvm_max_routes,
bool expect_failure)
{
int fd[MAX_SPI];
uint64_t val;
int ret, f;
uint64_t i;
/*
* There is no way to try injecting an SGI or PPI as the interface
* starts counting from the first SPI (above the private ones), so just
* exit.
*/
if (INTID_IS_SGI(intid) || INTID_IS_PPI(intid))
return;
kvm_set_gsi_routing_irqchip_check(vm, intid, num,
kvm_max_routes, expect_failure);
/*
* If expect_failure, then just to inject anyway. These
* will silently fail. And in any case, the guest will check
* that no actual interrupt was injected for those cases.
*/
for (f = 0, i = intid; i < (uint64_t)intid + num; i++, f++) {
fd[f] = eventfd(0, 0);
TEST_ASSERT(fd[f] != -1,
"eventfd failed, errno: %i\n", errno);
}
for (f = 0, i = intid; i < (uint64_t)intid + num; i++, f++) {
struct kvm_irqfd irqfd = {
.fd = fd[f],
.gsi = i - MIN_SPI,
};
assert(i <= (uint64_t)UINT_MAX);
vm_ioctl(vm, KVM_IRQFD, &irqfd);
}
for (f = 0, i = intid; i < (uint64_t)intid + num; i++, f++) {
val = 1;
ret = write(fd[f], &val, sizeof(uint64_t));
TEST_ASSERT(ret == sizeof(uint64_t),
"Write to KVM_IRQFD failed with ret: %d\n", ret);
}
for (f = 0, i = intid; i < (uint64_t)intid + num; i++, f++)
close(fd[f]);
}
/* handles the valid case: intid=0xffffffff num=1 */
#define for_each_intid(first, num, tmp, i) \
for ((tmp) = (i) = (first); \
@ -500,6 +592,11 @@ static void run_guest_cmd(struct kvm_vm *vm, int gic_fd,
kvm_irq_set_level_info_check(gic_fd, i, 1,
expect_failure);
break;
case KVM_INJECT_IRQFD:
kvm_routing_and_irqfd_check(vm, intid, num,
test_args->kvm_max_routes,
expect_failure);
break;
default:
break;
}
@ -534,6 +631,8 @@ static void test_vgic(uint32_t nr_irqs, bool level_sensitive, bool eoi_split)
.nr_irqs = nr_irqs,
.level_sensitive = level_sensitive,
.eoi_split = eoi_split,
.kvm_max_routes = kvm_check_cap(KVM_CAP_IRQ_ROUTING),
.kvm_supports_irqfd = kvm_check_cap(KVM_CAP_IRQFD),
};
print_args(&args);

2
tools/testing/selftests/kvm/include/aarch64/vgic.h
View File

@ -29,4 +29,6 @@ int _kvm_arm_irq_line(struct kvm_vm *vm, uint32_t intid, int level);
void kvm_irq_write_ispendr(int gic_fd, uint32_t intid, uint32_t vcpu);
void kvm_irq_write_isactiver(int gic_fd, uint32_t intid, uint32_t vcpu);
#define KVM_IRQCHIP_NUM_PINS (1020 - 32)
#endif // SELFTEST_KVM_VGIC_H