[PATCH v4 09/18] KVM: arm64: selftests: Add guest support to get the vcpuid
From: Raghavendra Rao Ananta <hidden>
Date: 2021-09-09 01:39:23
Also in:
kvm, kvmarm, lkml
Subsystem:
kernel selftest framework, kernel virtual machine (kvm), the rest · Maintainers:
Shuah Khan, Paolo Bonzini, Linus Torvalds
At times, such as when in the interrupt handler, the guest wants to get the vcpuid that it's running on. As a result, introduce get_vcpuid() that returns the vcpuid of the calling vcpu. At its backend, the VMM prepares a map of vcpuid and mpidr during VM initialization and exports the map to the guest for it to read. Signed-off-by: Raghavendra Rao Ananta <redacted> --- .../selftests/kvm/include/aarch64/processor.h | 3 ++ .../selftests/kvm/lib/aarch64/processor.c | 46 +++++++++++++++++++ 2 files changed, 49 insertions(+)
diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
index b6088c3c67a3..150f63101f4c 100644
--- a/tools/testing/selftests/kvm/include/aarch64/processor.h
+++ b/tools/testing/selftests/kvm/include/aarch64/processor.h@@ -133,6 +133,7 @@ void vm_install_exception_handler(struct kvm_vm *vm, int vector, handler_fn handler); void vm_install_sync_handler(struct kvm_vm *vm, int vector, int ec, handler_fn handler); +void vm_vcpuid_map_init(struct kvm_vm *vm); static inline void cpu_relax(void) {
@@ -194,4 +195,6 @@ static inline void local_irq_disable(void) asm volatile("msr daifset, #3" : : : "memory"); } +int get_vcpuid(void); + #endif /* SELFTEST_KVM_PROCESSOR_H */
diff --git a/tools/testing/selftests/kvm/lib/aarch64/processor.c b/tools/testing/selftests/kvm/lib/aarch64/processor.c
index 632b74d6b3ca..9844b62227b1 100644
--- a/tools/testing/selftests/kvm/lib/aarch64/processor.c
+++ b/tools/testing/selftests/kvm/lib/aarch64/processor.c@@ -13,9 +13,17 @@ #include "processor.h" #define DEFAULT_ARM64_GUEST_STACK_VADDR_MIN 0xac0000 +#define VM_VCPUID_MAP_INVAL -1 static vm_vaddr_t exception_handlers; +struct vm_vcpuid_map { + uint64_t mpidr; + int vcpuid; +}; + +static struct vm_vcpuid_map vcpuid_map[KVM_MAX_VCPUS]; + static uint64_t page_align(struct kvm_vm *vm, uint64_t v) { return (v + vm->page_size) & ~(vm->page_size - 1);
@@ -426,3 +434,41 @@ void vm_install_exception_handler(struct kvm_vm *vm, int vector, assert(vector < VECTOR_NUM); handlers->exception_handlers[vector][0] = handler; } + +void vm_vcpuid_map_init(struct kvm_vm *vm) +{ + int i = 0; + struct vcpu *vcpu; + struct vm_vcpuid_map *map; + + list_for_each_entry(vcpu, &vm->vcpus, list) { + map = &vcpuid_map[i++]; + map->vcpuid = vcpu->id; + get_reg(vm, vcpu->id, + ARM64_SYS_KVM_REG(SYS_MPIDR_EL1), &map->mpidr); + map->mpidr &= MPIDR_HWID_BITMASK; + } + + if (i < KVM_MAX_VCPUS) + vcpuid_map[i].vcpuid = VM_VCPUID_MAP_INVAL; + + sync_global_to_guest(vm, vcpuid_map); +} + +int get_vcpuid(void) +{ + int i, vcpuid; + uint64_t mpidr = read_sysreg(mpidr_el1) & MPIDR_HWID_BITMASK; + + for (i = 0; i < KVM_MAX_VCPUS; i++) { + vcpuid = vcpuid_map[i].vcpuid; + GUEST_ASSERT_1(vcpuid != VM_VCPUID_MAP_INVAL, mpidr); + + if (mpidr == vcpuid_map[i].mpidr) + return vcpuid; + } + + /* We should not be reaching here */ + GUEST_ASSERT_1(0, mpidr); + return -1; +}
--
2.33.0.153.gba50c8fa24-goog
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