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KVM: arm64: selftests: Add test for nASSGIcap attribute

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Extend vgic_init to test the nASSGIcap attribute, asserting that it is
configurable (within reason) prior to initializing the VGIC.
Additionally, check that userspace cannot set the attribute after the
VGIC has been initialized.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20250724062805.2658919-6-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Raghavendra Rao Ananta 2025-07-23 23:28:04 -07:00 committed by Oliver Upton
parent c652887a92
commit 15b5964a41
1 changed files with 40 additions and 2 deletions
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42
tools/testing/selftests/kvm/arm64/vgic_init.c
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@ -13,13 +13,12 @@
#include "kvm_util.h"
#include "processor.h"
#include "vgic.h"
#include "gic_v3.h"
#define NR_VCPUS 4
#define REG_OFFSET(vcpu, offset) (((uint64_t)vcpu << 32) | offset)
#define GICR_TYPER 0x8
#define VGIC_DEV_IS_V2(_d) ((_d) == KVM_DEV_TYPE_ARM_VGIC_V2)
#define VGIC_DEV_IS_V3(_d) ((_d) == KVM_DEV_TYPE_ARM_VGIC_V3)
@ -675,6 +674,44 @@ static void test_v3_its_region(void)
vm_gic_destroy(&v);
}
static void test_v3_nassgicap(void)
{
struct kvm_vcpu *vcpus[NR_VCPUS];
bool has_nassgicap;
struct vm_gic vm;
u32 typer2;
int ret;
vm = vm_gic_create_with_vcpus(KVM_DEV_TYPE_ARM_VGIC_V3, NR_VCPUS, vcpus);
kvm_device_attr_get(vm.gic_fd, KVM_DEV_ARM_VGIC_GRP_DIST_REGS,
GICD_TYPER2, &typer2);
has_nassgicap = typer2 & GICD_TYPER2_nASSGIcap;
typer2 |= GICD_TYPER2_nASSGIcap;
ret = __kvm_device_attr_set(vm.gic_fd, KVM_DEV_ARM_VGIC_GRP_DIST_REGS,
GICD_TYPER2, &typer2);
if (has_nassgicap)
TEST_ASSERT(!ret, KVM_IOCTL_ERROR(KVM_DEVICE_ATTR_SET, ret));
else
TEST_ASSERT(ret && errno == EINVAL,
"Enabled nASSGIcap even though it's unavailable");
typer2 &= ~GICD_TYPER2_nASSGIcap;
kvm_device_attr_set(vm.gic_fd, KVM_DEV_ARM_VGIC_GRP_DIST_REGS,
GICD_TYPER2, &typer2);
kvm_device_attr_set(vm.gic_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
KVM_DEV_ARM_VGIC_CTRL_INIT, NULL);
typer2 ^= GICD_TYPER2_nASSGIcap;
ret = __kvm_device_attr_set(vm.gic_fd, KVM_DEV_ARM_VGIC_GRP_DIST_REGS,
GICD_TYPER2, &typer2);
TEST_ASSERT(ret && errno == EBUSY,
"Changed nASSGIcap after initializing the VGIC");
vm_gic_destroy(&vm);
}
/*
* Returns 0 if it's possible to create GIC device of a given type (V2 or V3).
*/
@ -730,6 +767,7 @@ void run_tests(uint32_t gic_dev_type)
test_v3_last_bit_single_rdist();
test_v3_redist_ipa_range_check_at_vcpu_run();
test_v3_its_region();
test_v3_nassgicap();
}
}