Re: [PATCH v3 8/8] KVM: selftests: aarch64/vgic-v3 init sequence tests

From: Auger Eric
Date: Wed Mar 31 2021 - 11:08:37 EST

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Hi Drew,

On 3/22/21 7:32 PM, Andrew Jones wrote:
> On Fri, Mar 12, 2021 at 06:32:02PM +0100, Eric Auger wrote:
>> The tests exercise the VGIC_V3 device creation including the
>> associated KVM_DEV_ARM_VGIC_GRP_ADDR group attributes:
>>
>> - KVM_VGIC_V3_ADDR_TYPE_DIST/REDIST
>> - KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION
>>
>> Some other tests dedicate to KVM_DEV_ARM_VGIC_GRP_REDIST_REGS group
>> and especially the GICR_TYPER read. The goal was to test the case
>> recently fixed by commit 23bde34771f1
>> ("KVM: arm64: vgic-v3: Drop the reporting of GICR_TYPER.Last for userspace").
>>
>> The API under test can be found at
>> Documentation/virt/kvm/devices/arm-vgic-v3.rst
>>
>> Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
>> ---
>> arch/arm64/kvm/vgic/vgic-mmio-v3.c | 2 +-
>> tools/testing/selftests/kvm/Makefile | 1 +
>> .../testing/selftests/kvm/aarch64/vgic_init.c | 672 ++++++++++++++++++
>> .../testing/selftests/kvm/include/kvm_util.h | 5 +
>> tools/testing/selftests/kvm/lib/kvm_util.c | 51 ++
>> 5 files changed, 730 insertions(+), 1 deletion(-)
>> create mode 100644 tools/testing/selftests/kvm/aarch64/vgic_init.c
>>
>> diff --git a/arch/arm64/kvm/vgic/vgic-mmio-v3.c b/arch/arm64/kvm/vgic/vgic-mmio-v3.c
>> index 652998ed0b55..f6a7eed1d6ad 100644
>> --- a/arch/arm64/kvm/vgic/vgic-mmio-v3.c
>> +++ b/arch/arm64/kvm/vgic/vgic-mmio-v3.c
>> @@ -260,7 +260,7 @@ static bool vgic_mmio_vcpu_rdist_is_last(struct kvm_vcpu *vcpu)
>> if (!rdreg)
>> return false;
>>
>> - if (!rdreg->count && vgic_cpu->rdreg_index == (rdreg->count - 1)) {
>> + if (rdreg->count && vgic_cpu->rdreg_index == (rdreg->count - 1)) {
>
> I guess this is an accidental change?
this change should be squashed into the previous patch
>
>> /* check whether there is no other contiguous rdist region */
>> struct list_head *rd_regions = &vgic->rd_regions;
>> struct vgic_redist_region *iter;
>> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
>> index a6d61f451f88..4e548d7ab0ab 100644
>> --- a/tools/testing/selftests/kvm/Makefile
>> +++ b/tools/testing/selftests/kvm/Makefile
>> @@ -75,6 +75,7 @@ TEST_GEN_PROGS_x86_64 += steal_time
>>
>> TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
>> TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list-sve
>> +TEST_GEN_PROGS_aarch64 += aarch64/vgic_init
>> TEST_GEN_PROGS_aarch64 += demand_paging_test
>> TEST_GEN_PROGS_aarch64 += dirty_log_test
>> TEST_GEN_PROGS_aarch64 += dirty_log_perf_test
>
> Missing .gitignore change
OK
>
>> diff --git a/tools/testing/selftests/kvm/aarch64/vgic_init.c b/tools/testing/selftests/kvm/aarch64/vgic_init.c
>> new file mode 100644
>> index 000000000000..12205ab9fb10
>> --- /dev/null
>> +++ b/tools/testing/selftests/kvm/aarch64/vgic_init.c
>> @@ -0,0 +1,672 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * vgic init sequence tests
>> + *
>> + * Copyright (C) 2020, Red Hat, Inc.
>> + */
>> +#define _GNU_SOURCE
>> +#include <linux/kernel.h>
>> +#include <sys/syscall.h>
>> +#include <asm/kvm.h>
>> +#include <asm/kvm_para.h>
>> +
>> +#include "test_util.h"
>> +#include "kvm_util.h"
>> +#include "processor.h"
>> +
>> +#define NR_VCPUS 4
>> +
>> +#define REDIST_REGION_ATTR_ADDR(count, base, flags, index) (((uint64_t)(count) << 52) | \
>> + ((uint64_t)((base) >> 16) << 16) | ((uint64_t)(flags) << 12) | index)
>> +#define REG_OFFSET(vcpu, offset) (((uint64_t)vcpu << 32) | offset)
>> +
>> +#define GICR_TYPER 0x8
>> +
>> +/* helper to access a redistributor register */
>> +static int access_redist_reg(int gicv3_fd, int vcpu, int offset,
>> + uint32_t *val, bool write)
>> +{
>> + uint64_t attr = REG_OFFSET(vcpu, offset);
>> +
>> + return kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_REDIST_REGS,
>> + attr, val, write);
>> +}
>> +
>> +/* dummy guest code */
>> +static void guest_code(int cpu)
>
> cpu is unused, no need for it
sure
>
>> +{
>> + GUEST_SYNC(0);
>> + GUEST_SYNC(1);
>> + GUEST_SYNC(2);
>> + GUEST_DONE();
>> +}
>> +
>> +/* we don't want to assert on run execution, hence that helper */
>> +static int run_vcpu(struct kvm_vm *vm, uint32_t vcpuid)
>> +{
>> + static int run;
>> + struct ucall uc;
>> + int ret;
>> +
>> + vcpu_args_set(vm, vcpuid, 1, vcpuid);
>
> The cpu index is unused, so you need to pass it in
removed
>
>> + ret = _vcpu_ioctl(vm, vcpuid, KVM_RUN, NULL);
>> + get_ucall(vm, vcpuid, &uc);
>
> uc is unused, so you can pass NULL for it
OK
>
>> + run++;
>
> What good is this counter? Nobody reads it.
removed
>
>> +
>> + if (ret)
>> + return -errno;
>> + return 0;
>> +}
>> +
>> +/**
>> + * Helper routine that performs KVM device tests in general and
>> + * especially ARM_VGIC_V3 ones. Eventually the ARM_VGIC_V3
>> + * device gets created, a legacy RDIST region is set at @0x0
>> + * and a DIST region is set @0x60000
>> + */
>> +int fuzz_dist_rdist(struct kvm_vm *vm)
>
> Missing static
sure
>
>> +{
>> + int ret, gicv3_fd, max_ipa_bits;
>> + uint64_t addr;
>> +
>> + max_ipa_bits = kvm_check_cap(KVM_CAP_ARM_VM_IPA_SIZE);
>> +
>> + /* check ARM_VGIC_V3 device exists */
>> + ret = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, true);
>> + if (ret) {
>> + print_skip("GICv3 not supported");
>> + exit(KSFT_SKIP);
>> + }
>> +
>> + /* try to create a non existing KVM device */
>> + ret = kvm_create_device(vm, 0, true);
>> + TEST_ASSERT(ret == -ENODEV, "unsupported device");
>> +
>> + /* Create the ARM_VGIC_V3 device */
>> + gicv3_fd = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, false);
>> + TEST_ASSERT(gicv3_fd > 0, "GICv3 device created");
>> +
>> + /* Check existing group/attributes */
>> + ret = kvm_device_check_attr(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_DIST);
>> + TEST_ASSERT(!ret, "KVM_DEV_ARM_VGIC_GRP_ADDR/KVM_VGIC_V3_ADDR_TYPE_DIST supported");
>> +
>> + ret = kvm_device_check_attr(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST);
>> + TEST_ASSERT(!ret, "KVM_DEV_ARM_VGIC_GRP_ADDR/KVM_VGIC_V3_ADDR_TYPE_REDIST supported");
>> +
>> + /* check non existing attribute */
>> + ret = kvm_device_check_attr(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR, 0);
>> + TEST_ASSERT(ret == -ENXIO, "attribute not supported");
>> +
>> + /* misaligned DIST and REDIST address settings */
>> + addr = 0x1000;
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_DIST, &addr, true);
>> + TEST_ASSERT(ret == -EINVAL, "GICv3 dist base not 64kB aligned");
>> +
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST, &addr, true);
>> + TEST_ASSERT(ret == -EINVAL, "GICv3 redist base not 64kB aligned");
>> +
>> + /* out of range address */
>> + if (max_ipa_bits) {
>> + addr = 1ULL << max_ipa_bits;
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_DIST, &addr, true);
>> + TEST_ASSERT(ret == -E2BIG, "dist address beyond IPA limit");
>> +
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST, &addr, true);
>> + TEST_ASSERT(ret == -E2BIG, "redist address beyond IPA limit");
>> + }
>> +
>> + /* set REDIST base address @0x0*/
>> + addr = 0x00000;
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST, &addr, true);
>> + TEST_ASSERT(!ret, "GICv3 redist base set");
>> +
>> + /* Attempt to create a second legacy redistributor region */
>> + addr = 0xE0000;
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST, &addr, true);
>> + TEST_ASSERT(ret == -EEXIST, "GICv3 redist base set again");
>> +
>> + /* Attempt to mix legacy and new redistributor regions */
>> + addr = REDIST_REGION_ATTR_ADDR(NR_VCPUS, 0x100000, 0, 0);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(ret == -EINVAL, "attempt to mix GICv3 REDIST and REDIST_REGION");
>> +
>> + /*
>> + * Set overlapping DIST / REDIST, cannot be detected here. Will be detected
>> + * on first vcpu run instead.
>> + */
>> + addr = 3 * 2 * 0x10000;
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR, KVM_VGIC_V3_ADDR_TYPE_DIST,
>> + &addr, true);
>> + TEST_ASSERT(!ret, "dist overlapping rdist");
>> +
>> + ret = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, false);
>> + TEST_ASSERT(ret == -EEXIST, "create GICv3 device twice");
>> +
>> + ret = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, true);
>> + TEST_ASSERT(!ret, "create GICv3 in test mode while the same already is created");
>> +
>> + if (!kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V2, true)) {
>> + ret = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V2, true);
>> + TEST_ASSERT(ret == -EINVAL, "create GICv2 while v3 exists");
>> + }
>> +
>> + return gicv3_fd;
>
> I don't like mixing the tests and the creation of the device. How about
> making this function a void function and closing the fd here and then
> creating another function that just opens an fd without the tests?

OK, I now implement your suggestion below, namely vm_gic vm_gic_create()
>
> Also, I don't think this is a fuzzer, as the function name indicates.
> It looks to me more like requirements based tests. A fuzzer would
> select (possibly randomly) a bunch of inputs, usually NULL pointers,
> unmapped pointers, and other garbage and then see what happens.

Fair enough, I will rename it
>
>> +}
>> +
>> +/* Test the new REDIST region API */
>> +static int fuzz_redist_regions(struct kvm_vm *vm)
>> +{
>> + int ret, max_ipa_bits, gicv3_fd;
>> + uint64_t addr, expected_addr;
>> +
>> + max_ipa_bits = kvm_check_cap(KVM_CAP_ARM_VM_IPA_SIZE);
>
> Could make this global and just set it once in main()
yep
>
>> +
>> + /* trial mode */
>> + ret = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, true);
>> + if (ret) {
>> + print_skip("GICv3 not supported");
>> + exit(KSFT_SKIP);
>> + }
>> +
>> + /* Create the actual gicv3 device */
>> + gicv3_fd = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, false);
>> + TEST_ASSERT(gicv3_fd >= 0, "VGIC_V3 device created");
>> +
>> + ret = kvm_device_check_attr(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST);
>> + TEST_ASSERT(!ret, "Multiple redist regions advertised");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(NR_VCPUS, 0x100000, 2, 0);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(ret == -EINVAL, "redist region attr value with flags != 0");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(0, 0x100000, 0, 0);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(ret == -EINVAL, "redist region attr value with count== 0");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(2, 0x200000, 0, 1);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(ret == -EINVAL, "attempt to register the first rdist region with index != 0");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(2, 0x201000, 0, 1);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(ret == -EINVAL, "rdist region with misaligned address");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(2, 0x200000, 0, 0);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(!ret, "First valid redist region with 2 rdist @ 0x200000, index 0");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(2, 0x200000, 0, 1);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(ret == -EINVAL, "register an rdist region with already used index");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(1, 0x210000, 0, 2);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(ret == -EINVAL, "register an rdist region overlapping with another one");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(1, 0x240000, 0, 2);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(ret == -EINVAL, "register redist region with index not +1");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(1, 0x240000, 0, 1);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(!ret, "register valid redist region with 1 rdist @ 0x220000, index 1");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(1, 1ULL << max_ipa_bits, 0, 2);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(ret == -E2BIG, "register redist region with base address beyond IPA range");
>> +
>> + addr = 0x260000;
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST, &addr, true);
>> + TEST_ASSERT(ret == -EINVAL, "Mix KVM_VGIC_V3_ADDR_TYPE_REDIST and REDIST_REGION");
>> +
>> + /*
>> + * Now there are 2 redist regions:
>> + * region 0 @ 0x200000 2 redists
>> + * region 1 @ 0x240000 1 redist
>> + * now attempt to read their characteristics
>> + */
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(0, 0, 0, 0);
>> + expected_addr = REDIST_REGION_ATTR_ADDR(2, 0x200000, 0, 0);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, false);
>> + TEST_ASSERT(!ret && addr == expected_addr, "read characteristics of region #0");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(0, 0, 0, 1);
>> + expected_addr = REDIST_REGION_ATTR_ADDR(1, 0x240000, 0, 1);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, false);
>> + TEST_ASSERT(!ret && addr == expected_addr, "read characteristics of region #1");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(0, 0, 0, 2);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, false);
>> + TEST_ASSERT(ret == -ENOENT, "read characteristics of non existing region");
>> +
>> + addr = 0x260000;
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_DIST, &addr, true);
>> + TEST_ASSERT(!ret, "set dist region");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(1, 0x260000, 0, 2);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(ret == -EINVAL, "register redist region colliding with dist");
>> +
>> + return gicv3_fd;
>
> Same comment as above about mixing the fd acquisition with the tests.
ok
>
>> +}
>> +
>> +/*
>> + * VGIC KVM device is created and initialized before the secondary CPUs
>> + * get created
>> + */
>> +static void test_vgic_then_vcpus(void)
>> +{
>> + int ret, i, gicv3_fd;
>> + struct kvm_vm *vm;
>> +
>> + vm = vm_create_default(0, 0, guest_code);
>> +
>> + gicv3_fd = fuzz_dist_rdist(vm);
>> +
>> + /* Add the rest of the VCPUs */
>> + for (i = 1; i < NR_VCPUS; ++i)
>> + vm_vcpu_add_default(vm, i, guest_code);
>> +
>> + ret = run_vcpu(vm, 3);
>> + TEST_ASSERT(ret == -EINVAL, "dist/rdist overlap detected on 1st vcpu run");
>> +
>> + close(gicv3_fd);
>> + kvm_vm_free(vm);
>> +}
>> +
>> +
>> +/* All the VCPUs are created before the VGIC KVM device gets initialized */
>> +static void test_vcpus_then_vgic(void)
>> +{
>> + int ret, i, gicv3_fd;
>> + struct kvm_vm *vm;
>> +
>> + vm = vm_create_default(0, 0, guest_code);
>> +
>> + /* Add the rest of the VCPUs */
>> + for (i = 1; i < NR_VCPUS; ++i)
>> + vm_vcpu_add_default(vm, i, guest_code);
>> +
>> + gicv3_fd = fuzz_dist_rdist(vm);
>> +
>> + ret = run_vcpu(vm, 3);
>> + TEST_ASSERT(ret == -EINVAL, "dist/rdist overlap detected on 1st vcpu run");
>> +
>> + close(gicv3_fd);
>> + kvm_vm_free(vm);
>> +}
>> +
>> +static void redist_regions_setup(struct kvm_vm **vm, int *gicv3_fd)
>> +{
>> + int i;
>> +
>> + *vm = vm_create_default(0, 0, guest_code);
>> + ucall_init(*vm, NULL);
>
> It's best to call this last, so it can find an unmapped memory region (in
> case mappings are being done, like I think fuzz_redist_regions does)
OK
>
>> +
>> + /* Add the rest of the VCPUs */
>> + for (i = 1; i < NR_VCPUS; ++i)
>> + vm_vcpu_add_default(*vm, i, guest_code);
>
> vm_create_default_with_vcpus(NR_VCPUS, 0, 0, guest_code, NULL)
OK
>
>> +
>> + *gicv3_fd = fuzz_redist_regions(*vm);
>> +}
>
> How about returning a vm_gic structure instead of taking two
> pointers as arguments?
done
>
> struct vm_gic {
> struct kvm_vm *vm;
> int gic_fd;
> };
>
> static struct vm_gic vm_gic_create(void)
> {
> struct vm_gic v;
>
> v.vm = vm_create_default_with_vcpus(NR_VCPUS, 0, 0, guest_code, NULL);
> v.gic_fd = gic_create(...);
> ucall_init(v.vm, NULL);
>
> return v;
> }
>
> static void vm_gic_destroy(struct vm_gic *v)
> {
> kvm_vm_free(v.vm);
> close(v.gic_fd);
> }
>
>> +
>> +static void test_new_redist_regions(void)
>> +{
>> + int ret, gicv3_fd;
>> + struct kvm_vm *vm;
>> + uint64_t addr;
>> + void *dummy = NULL;
>> +
>> + redist_regions_setup(&vm, &gicv3_fd);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
>> + KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
>> + TEST_ASSERT(!ret, "init the vgic");
>> +
>> + ret = run_vcpu(vm, 3);
>> + TEST_ASSERT(ret == -ENXIO, "running without sufficient number of rdists");
>> +
>> + close(gicv3_fd);
>> + kvm_vm_free(vm);
>> +
>> + /* step2 */
>> +
>> + redist_regions_setup(&vm, &gicv3_fd);
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(1, 0x280000, 0, 2);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(!ret, "register a third region allowing to cover the 4 vcpus");
>> +
>> + ret = run_vcpu(vm, 3);
>> + TEST_ASSERT(ret == -EBUSY, "running without vgic explicit init");
>> +
>> + close(gicv3_fd);
>> + kvm_vm_free(vm);
>> +
>> + /* step 3 */
>> +
>> + redist_regions_setup(&vm, &gicv3_fd);
>> +
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, dummy, true);
>> + TEST_ASSERT(ret == -EFAULT, "register a third region allowing to cover the 4 vcpus");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(1, 0x280000, 0, 2);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(!ret, "register a third region allowing to cover the 4 vcpus");
>> +
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
>> + KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
>> + TEST_ASSERT(!ret, "init the vgic");
>> +
>> + ret = run_vcpu(vm, 3);
>> + TEST_ASSERT(!ret, "vcpu run");
>> +
>> + close(gicv3_fd);
>> + kvm_vm_free(vm);
>> +}
>> +
>> +static void test_typer_accesses(void)
>> +{
>> + int ret, i, gicv3_fd = -1;
>> + uint64_t addr;
>> + struct kvm_vm *vm;
>> + uint32_t val;
>> +
>> + vm = vm_create_default(0, 0, guest_code);
>> + ucall_init(vm, NULL);
>> +
>> + gicv3_fd = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, false);
>> + TEST_ASSERT(gicv3_fd >= 0, "VGIC_V3 device created");
>> +
>> + vm_vcpu_add_default(vm, 3, guest_code);
>> +
>> + ret = access_redist_reg(gicv3_fd, 1, GICR_TYPER, &val, false);
>> + TEST_ASSERT(ret == -EINVAL, "attempting to read GICR_TYPER of non created vcpu");
>> +
>> + vm_vcpu_add_default(vm, 1, guest_code);
>> +
>> + ret = access_redist_reg(gicv3_fd, 1, GICR_TYPER, &val, false);
>> + TEST_ASSERT(ret == -EBUSY, "read GICR_TYPER before GIC initialized");
>> +
>> + vm_vcpu_add_default(vm, 2, guest_code);
>> +
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
>> + KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
>> + TEST_ASSERT(!ret, "init the vgic after the vcpu creations");
>> +
>> + for (i = 0; i < NR_VCPUS ; i++) {
>> + ret = access_redist_reg(gicv3_fd, 0, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && !val, "read GICR_TYPER before rdist region setting");
>> + }
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(2, 0x200000, 0, 0);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(!ret, "first rdist region with a capacity of 2 rdists");
>> +
>> + /* The 2 first rdists should be put there (vcpu 0 and 3) */
>> + ret = access_redist_reg(gicv3_fd, 0, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && !val, "read typer of rdist #0");
>> +
>> + ret = access_redist_reg(gicv3_fd, 3, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x310, "read typer of rdist #1");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(10, 0x100000, 0, 1);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(ret == -EINVAL, "collision with previous rdist region");
>> +
>> + ret = access_redist_reg(gicv3_fd, 1, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x100,
>> + "no redist region attached to vcpu #1 yet, last cannot be returned");
>> +
>> + ret = access_redist_reg(gicv3_fd, 2, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x200,
>> + "no redist region attached to vcpu #2, last cannot be returned");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(10, 0x20000, 0, 1);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(!ret, "second rdist region");
>> +
>> + ret = access_redist_reg(gicv3_fd, 1, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x100, "read typer of rdist #1");
>> +
>> + ret = access_redist_reg(gicv3_fd, 2, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x210,
>> + "read typer of rdist #1, last properly returned");
>> +
>> + close(gicv3_fd);
>> + kvm_vm_free(vm);
>> +}
>> +
>> +/**
>> + * Test GICR_TYPER last bit with new redist regions
>> + * 2 rdist regions that are contiguous
>> + * rdist region #0 @0x200000 3 rdist capacity
>> + * rdists: 0, 2 (Last), 1
>> + * rdist region #1 @0x260000 10 rdist capacity
>> + * rdists: 3, 5 (Last), 4 (Last)
>> + */
>> +static void test_last_bit_1(void)
>> +{
>> + int ret, gicv3_fd = -1;
>> + uint64_t addr;
>> + struct kvm_vm *vm;
>> + uint32_t val;
>> +
>> + vm = vm_create_default(0, 0, guest_code);
>> + ucall_init(vm, NULL);
>> +
>> + gicv3_fd = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, false);
>> + TEST_ASSERT(gicv3_fd >= 0, "VGIC_V3 device created");
>> +
>> + vm_vcpu_add_default(vm, 2, guest_code);
>> + vm_vcpu_add_default(vm, 1, guest_code);
>> + vm_vcpu_add_default(vm, 3, guest_code);
>> + vm_vcpu_add_default(vm, 5, guest_code);
>> + vm_vcpu_add_default(vm, 4, guest_code);
>
> You can still use vm_create_default_with_vcpus, just provide a vcpuids
> array
>
> uint32_t vcpuids[] = { 0, 2, 1, 3, 5, 4 };
> vm = vm_create_default_with_vcpus(NR_VCPUS, 0, 0, guest_code, vcpuids);
OK
>
>> +
>> + ret = access_redist_reg(gicv3_fd, 0, GICR_TYPER, &val, false);
>> + TEST_ASSERT(ret, "read typer of rdist #0 before redist reg creation");
>> +
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
>> + KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
>> + TEST_ASSERT(!ret, "init the vgic after the vcpu creations");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(3, 0x200000, 0, 0);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(!ret, "rdist region #0 with a capacity of 3 rdists");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(10, 0x260000, 0, 1);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(!ret, "rdist region #1 (1 rdist) contiguous with the 1st one");
>> +
>> + /*
>> + * rdist_region #0 should contain rdists 0, 2, 1
>> + * rdist region #1 should contain rdists 3, 5, 4
>> + */
>> + ret = access_redist_reg(gicv3_fd, 0, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && !val, "read typer of rdist #0");
>> +
>> + ret = access_redist_reg(gicv3_fd, 2, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x210, "read typer of rdist #2");
>> +
>> + ret = access_redist_reg(gicv3_fd, 1, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x100, "read typer of rdist #1");
>> +
>> + ret = access_redist_reg(gicv3_fd, 3, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x300, "read typer of rdist #3");
>> +
>> + ret = access_redist_reg(gicv3_fd, 5, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x510, "read typer of rdist #3");
>> +
>> + ret = access_redist_reg(gicv3_fd, 4, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x410, "read typer of rdist #3");
>> +
>> + close(gicv3_fd);
>> + kvm_vm_free(vm);
>> +}
>> +
>> +/**
>> + * Test GICR_TYPER last bit with new redist regions
>> + * rdist regions #1 and #2 are contiguous
>> + * rdist region #0 @0x100000 1 rdist capacity
>> + * rdists: 0 (Last)
>> + * rdist region #1 @0x240000 3 rdist capacity
>> + * rdists: 3, 5 (Last), 4 (Last)
>> + * rdist region #2 @0x200000 2 rdist capacity
>> + * rdists: 1, 2
>> + */
>> +static void test_last_bit_2(void)
>> +{
>> + int ret, gicv3_fd;
>> + uint64_t addr;
>> + struct kvm_vm *vm;
>> + uint32_t val;
>> +
>> + vm = vm_create_default(0, 0, guest_code);
>> + vm_vcpu_add_default(vm, 3, guest_code);
>> + vm_vcpu_add_default(vm, 5, guest_code);
>> + vm_vcpu_add_default(vm, 4, guest_code);
>> + vm_vcpu_add_default(vm, 1, guest_code);
>> + vm_vcpu_add_default(vm, 2, guest_code);
>> +
>> + ucall_init(vm, NULL);
>> +
>> + gicv3_fd = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, false);
>> + TEST_ASSERT(gicv3_fd >= 0, "VGIC_V3 device created");
>> +
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
>> + KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
>> + TEST_ASSERT(!ret, "init the vgic after the vcpu creations");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(1, 0x100000, 0, 0);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(!ret, "rdist region #0 (1 rdist)");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(3, 0x240000, 0, 1);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(!ret, "rdist region #1 (1 rdist) contiguous with #2");
>> +
>> + addr = REDIST_REGION_ATTR_ADDR(2, 0x200000, 0, 2);
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
>> + TEST_ASSERT(!ret, "rdist region #2 with a capacity of 3 rdists");
>> +
>> +
>> + ret = access_redist_reg(gicv3_fd, 0, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x010, "read typer of rdist #0");
>> +
>> + ret = access_redist_reg(gicv3_fd, 1, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x100, "read typer of rdist #1");
>> +
>> + ret = access_redist_reg(gicv3_fd, 2, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x200, "read typer of rdist #2");
>> +
>> + ret = access_redist_reg(gicv3_fd, 3, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x300, "read typer of rdist #3");
>> +
>> + ret = access_redist_reg(gicv3_fd, 5, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x510, "read typer of rdist #3");
>> +
>> + ret = access_redist_reg(gicv3_fd, 4, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x410, "read typer of rdist #3");
>> +
>> + close(gicv3_fd);
>> + kvm_vm_free(vm);
>> +}
>> +
>> +/* Test last bit with legacy region */
>> +static void test_last_bit_3(void)
>> +{
>> + int ret, gicv3_fd;
>> + uint64_t addr;
>> + struct kvm_vm *vm;
>> + uint32_t val;
>> +
>> + vm = vm_create_default(0, 0, guest_code);
>> + vm_vcpu_add_default(vm, 3, guest_code);
>> + vm_vcpu_add_default(vm, 5, guest_code);
>> + vm_vcpu_add_default(vm, 4, guest_code);
>> + vm_vcpu_add_default(vm, 1, guest_code);
>> + vm_vcpu_add_default(vm, 2, guest_code);
>> +
>> + ucall_init(vm, NULL);
>> +
>> + gicv3_fd = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, false);
>> + TEST_ASSERT(gicv3_fd >= 0, "VGIC_V3 device created");
>> +
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
>> + KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
>> + TEST_ASSERT(!ret, "init the vgic after the vcpu creations");
>> +
>> + addr = 0x10000;
>> + ret = kvm_device_access(gicv3_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
>> + KVM_VGIC_V3_ADDR_TYPE_REDIST, &addr, true);
>> +
>> + ret = access_redist_reg(gicv3_fd, 0, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x000, "read typer of rdist #0");
>> +
>> + ret = access_redist_reg(gicv3_fd, 3, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x300, "read typer of rdist #1");
>> +
>> + ret = access_redist_reg(gicv3_fd, 5, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x510, "read typer of rdist #2");
>> +
>> + ret = access_redist_reg(gicv3_fd, 1, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x100, "read typer of rdist #3");
>> +
>> + ret = access_redist_reg(gicv3_fd, 2, GICR_TYPER, &val, false);
>> + TEST_ASSERT(!ret && val == 0x210, "read typer of rdist #3");
>> +
>> + close(gicv3_fd);
>> + kvm_vm_free(vm);
>> +}
>> +
>> +int main(int ac, char **av)
>> +{
>> + test_vcpus_then_vgic();
>> + test_vgic_then_vcpus();
>> + test_new_redist_regions();
>> + test_typer_accesses();
>> + test_last_bit_1();
>> + test_last_bit_2();
>> + test_last_bit_3();
>> +
>> + return 0;
>> +}
>> +
>> diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
>> index 2d7eb6989e83..f82277cadc6b 100644
>> --- a/tools/testing/selftests/kvm/include/kvm_util.h
>> +++ b/tools/testing/selftests/kvm/include/kvm_util.h
>> @@ -223,6 +223,11 @@ int vcpu_nested_state_set(struct kvm_vm *vm, uint32_t vcpuid,
>> #endif
>> void *vcpu_map_dirty_ring(struct kvm_vm *vm, uint32_t vcpuid);
>>
>> +int kvm_device_check_attr(int dev_fd, uint32_t group, uint64_t attr);
>> +int kvm_create_device(struct kvm_vm *vm, uint64_t type, bool test);
>> +int kvm_device_access(int dev_fd, uint32_t group, uint64_t attr,
>> + void *val, bool write);
>> +
>> const char *exit_reason_str(unsigned int exit_reason);
>>
>> void virt_pgd_alloc(struct kvm_vm *vm, uint32_t pgd_memslot);
>> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
>> index e5fbf16f725b..da43c1f5730e 100644
>> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
>> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
>> @@ -1728,6 +1728,57 @@ int _kvm_ioctl(struct kvm_vm *vm, unsigned long cmd, void *arg)
>> return ioctl(vm->kvm_fd, cmd, arg);
>> }
>>
>> +/*
>> + * Device Ioctl
>> + */
>> +
>> +int kvm_device_check_attr(int dev_fd, uint32_t group, uint64_t attr)
>> +{
>> + struct kvm_device_attr attribute = {
>> + .group = group,
>> + .attr = attr,
>> + .flags = 0,
>> + };
>> + int ret;
>> +
>> + ret = ioctl(dev_fd, KVM_HAS_DEVICE_ATTR, &attribute);
>> + if (ret == -1)
>> + return -errno;
>
> This isn't are usual style. We usually assert on error in these
> helpers and we create an _ variant, like _kvm_device_check_attr,
> if we want the return value and errno to be returned. Something
> like
>
> int _kvm_device_check_attr(int dev_fd, uint32_t group, uint64_t attr)
> {
> struct kvm_device_attr attribute = {
> .group = group,
> .attr = attr,
> .flags = 0,
> };
>
> return ioctl(dev_fd, KVM_HAS_DEVICE_ATTR, &attribute);
> }
>
> void kvm_device_check_attr(int dev_fd, uint32_t group, uint64_t attr)
> {
> int ret = _kvm_device_check_attr(dev_fd, group, attr);
> TEST_ASSERT(ret == 0, ...);
> }
>
> Or, if you want the check to be useful for probing, then maybe
>
> bool kvm_device_check_attr(int dev_fd, uint32_t group, uint64_t attr)
> {
> int ret = _kvm_device_check_attr(dev_fd, group, attr);
> TEST_ASSERT(ret == 0 || errno == ENXIO, ...);
> return !ret;
> }
>
> Same comment for the other new device API below.

OK. However my tests check the errno so I will rather use the "_"
variant and return -errno there.
>
>> + return ret;
>> +}
>> +
>> +int kvm_create_device(struct kvm_vm *vm, uint64_t type, bool test)
>> +{
>> + struct kvm_create_device create_dev;
>> + int ret;
>> +
>> + create_dev.type = type;
>> + create_dev.fd = -1;
>> + create_dev.flags = test ? KVM_CREATE_DEVICE_TEST : 0;
>> + ret = ioctl(vm_get_fd(vm), KVM_CREATE_DEVICE, &create_dev);
>> + if (ret == -1)
>> + return -errno;
>> + return test ? 0 : create_dev.fd;
>> +}
>> +
>> +int kvm_device_access(int dev_fd, uint32_t group, uint64_t attr,
>> + void *val, bool write)
>> +{
>> + struct kvm_device_attr kvmattr = {
>> + .group = group,
>> + .attr = attr,
>> + .flags = 0,
>> + .addr = (uintptr_t)val,
>> + };
>> + int ret;
>> +
>> + ret = ioctl(dev_fd, write ? KVM_SET_DEVICE_ATTR : KVM_GET_DEVICE_ATTR,
>> + &kvmattr);
>> + if (ret)
>> + return -errno;
>> + return ret;
>> +}
>> +
>> /*
>> * VM Dump
>> *
>> --
>> 2.26.2
>>
>
> Thanks for the test! I only looked at it from a framework perspective, not
> from a "how to test the vgic" perspective.

Thank you for the review!

Thanks

Eric
>
> Thanks,
> drew
>

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