Implement a simple library to perform vGIC-v3 setup
from a host point of view. This includes creating a
vGIC device, setting up distributor and redistributor
attributes, and mapping the guest physical addresses.
The definition of REDIST_REGION_ATTR_ADDR is taken
from aarch64/vgic_init test.
Signed-off-by: Raghavendra Rao Ananta <rananta@xxxxxxxxxx>
---
tools/testing/selftests/kvm/Makefile | 2 +-
.../selftests/kvm/include/aarch64/vgic.h | 20 +++++++
.../testing/selftests/kvm/lib/aarch64/vgic.c | 60 +++++++++++++++++++
3 files changed, 81 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/kvm/include/aarch64/vgic.h
create mode 100644 tools/testing/selftests/kvm/lib/aarch64/vgic.c
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 5476a8ddef60..8342f65c1d96 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -35,7 +35,7 @@ endif
LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/rbtree.c lib/sparsebit.c lib/test_util.c lib/guest_modes.c lib/perf_test_util.c
LIBKVM_x86_64 = lib/x86_64/apic.c lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/svm.c lib/x86_64/ucall.c lib/x86_64/handlers.S
-LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S lib/aarch64/spinlock.c lib/aarch64/gic.c lib/aarch64/gic_v3.c
+LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S lib/aarch64/spinlock.c lib/aarch64/gic.c lib/aarch64/gic_v3.c lib/aarch64/vgic.c
LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c lib/s390x/diag318_test_handler.c
TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test
diff --git a/tools/testing/selftests/kvm/include/aarch64/vgic.h b/tools/testing/selftests/kvm/include/aarch64/vgic.h
new file mode 100644
index 000000000000..3a776af958a0
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/aarch64/vgic.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ARM Generic Interrupt Controller (GIC) host specific defines
+ */
+
+#ifndef SELFTEST_KVM_VGIC_H
+#define SELFTEST_KVM_VGIC_H
+
+#include <linux/kvm.h>
+
+#define REDIST_REGION_ATTR_ADDR(count, base, flags, index) \
+ (((uint64_t)(count) << 52) | \
+ ((uint64_t)((base) >> 16) << 16) | \
+ ((uint64_t)(flags) << 12) | \
+ index)
+
+int vgic_v3_setup(struct kvm_vm *vm,
+ uint64_t gicd_base_gpa, uint64_t gicr_base_gpa);
+
+#endif /* SELFTEST_KVM_VGIC_H */
diff --git a/tools/testing/selftests/kvm/lib/aarch64/vgic.c b/tools/testing/selftests/kvm/lib/aarch64/vgic.c
new file mode 100644
index 000000000000..2318912ab134
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/aarch64/vgic.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ARM Generic Interrupt Controller (GIC) v3 host support
+ */
+
+#include <linux/kvm.h>
+#include <linux/sizes.h>
+
+#include "kvm_util.h"
+#include "vgic.h"
+
+#define VGIC_V3_GICD_SZ (SZ_64K)
+#define VGIC_V3_GICR_SZ (2 * SZ_64K)
+
+/*
+ * vGIC-v3 default host setup
+ *
+ * Input args:
+ * vm - KVM VM
+ * gicd_base_gpa - Guest Physical Address of the Distributor region
+ * gicr_base_gpa - Guest Physical Address of the Redistributor region
+ *
+ * Output args: None
+ *
+ * Return: GIC file-descriptor or negative error code upon failure
+ *
+ * The function creates a vGIC-v3 device and maps the distributor and
+ * 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,
+ uint64_t gicd_base_gpa, uint64_t gicr_base_gpa)
+{
+ uint64_t redist_attr;
+ int gic_fd, nr_vcpus;
+ unsigned int nr_gic_pages;
+
+ nr_vcpus = vm_get_nr_vcpus(vm);
+ TEST_ASSERT(nr_vcpus > 0, "Invalid number of CPUs: %u\n", nr_vcpus);
+
+ /* Distributor setup */
+ gic_fd = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, false);
+ kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
+ KVM_VGIC_V3_ADDR_TYPE_DIST, &gicd_base_gpa, true);
+ nr_gic_pages = vm_calc_num_guest_pages(vm_get_mode(vm), VGIC_V3_GICD_SZ);
+ virt_map(vm, gicd_base_gpa, gicd_base_gpa, nr_gic_pages);
+
+ /* Redistributor setup */
+ redist_attr = REDIST_REGION_ATTR_ADDR(nr_vcpus, gicr_base_gpa, 0, 0);
+ kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
+ KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &redist_attr, true);
+ nr_gic_pages = vm_calc_num_guest_pages(vm_get_mode(vm),
+ VGIC_V3_GICR_SZ * nr_vcpus);
+ virt_map(vm, gicr_base_gpa, gicr_base_gpa, nr_gic_pages);
+
+ kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
+ KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
+
+ return gic_fd;
+}
--
2.33.0.153.gba50c8fa24-goog
