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KVM: arm64: selftests: Add unsanitised helpers for VGICv3 creation

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vgic_v3_setup() has a good bit of sanity checking internally to ensure
that vCPUs have actually been created and match the dimensioning of the
vgic itself. Spin off an unsanitised setup and initialization helper so
vgic initialization can be wired in around a 'default' VM's vCPU
creation.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Oliver Upton 2025-09-17 14:20:34 -07:00 committed by Marc Zyngier
parent b712afa7a1
commit b8daa7ceac
2 changed files with 36 additions and 18 deletions
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2
tools/testing/selftests/kvm/include/arm64/vgic.h
View File

@ -17,6 +17,8 @@
index)
bool kvm_supports_vgic_v3(void);
int __vgic_v3_setup(struct kvm_vm *vm, unsigned int nr_vcpus, uint32_t nr_irqs);
void __vgic_v3_init(int fd);
int vgic_v3_setup(struct kvm_vm *vm, unsigned int nr_vcpus, uint32_t nr_irqs);
#define VGIC_MAX_RESERVED 1023

52
tools/testing/selftests/kvm/lib/arm64/vgic.c
View File

@ -41,24 +41,11 @@ bool kvm_supports_vgic_v3(void)
* redistributor regions of the guest. Since it depends on the number of
* vCPUs for the VM, it must be called after all the vCPUs have been created.
*/
int vgic_v3_setup(struct kvm_vm *vm, unsigned int nr_vcpus, uint32_t nr_irqs)
int __vgic_v3_setup(struct kvm_vm *vm, unsigned int nr_vcpus, uint32_t nr_irqs)
{
int gic_fd;
uint64_t attr;
struct list_head *iter;
unsigned int nr_gic_pages, nr_vcpus_created = 0;
TEST_ASSERT(nr_vcpus, "Number of vCPUs cannot be empty");
/*
* Make sure that the caller is infact calling this
* function after all the vCPUs are added.
*/
list_for_each(iter, &vm->vcpus)
nr_vcpus_created++;
TEST_ASSERT(nr_vcpus == nr_vcpus_created,
"Number of vCPUs requested (%u) doesn't match with the ones created for the VM (%u)",
nr_vcpus, nr_vcpus_created);
unsigned int nr_gic_pages;
/* Distributor setup */
gic_fd = __kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3);
@ -81,12 +68,41 @@ int vgic_v3_setup(struct kvm_vm *vm, unsigned int nr_vcpus, uint32_t nr_irqs)
KVM_VGIC_V3_REDIST_SIZE * nr_vcpus);
virt_map(vm, GICR_BASE_GPA, GICR_BASE_GPA, nr_gic_pages);
kvm_device_attr_set(gic_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
KVM_DEV_ARM_VGIC_CTRL_INIT, NULL);
return gic_fd;
}
void __vgic_v3_init(int fd)
{
kvm_device_attr_set(fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
KVM_DEV_ARM_VGIC_CTRL_INIT, NULL);
}
int vgic_v3_setup(struct kvm_vm *vm, unsigned int nr_vcpus, uint32_t nr_irqs)
{
unsigned int nr_vcpus_created = 0;
struct list_head *iter;
int fd;
TEST_ASSERT(nr_vcpus, "Number of vCPUs cannot be empty");
/*
* Make sure that the caller is infact calling this
* function after all the vCPUs are added.
*/
list_for_each(iter, &vm->vcpus)
nr_vcpus_created++;
TEST_ASSERT(nr_vcpus == nr_vcpus_created,
"Number of vCPUs requested (%u) doesn't match with the ones created for the VM (%u)",
nr_vcpus, nr_vcpus_created);
fd = __vgic_v3_setup(vm, nr_vcpus, nr_irqs);
if (fd < 0)
return fd;
__vgic_v3_init(fd);
return fd;
}
/* should only work for level sensitive interrupts */
int _kvm_irq_set_level_info(int gic_fd, uint32_t intid, int level)
{