Add interrupt and exception handler register interface. When exception happens, execute registered exception handler if exists, else report error.
Signed-off-by: Bibo Mao maobibo@loongson.cn --- .../kvm/include/loongarch/processor.h | 14 +++++++++ .../selftests/kvm/lib/loongarch/processor.c | 29 +++++++++++++++++++ 2 files changed, 43 insertions(+)
diff --git a/tools/testing/selftests/kvm/include/loongarch/processor.h b/tools/testing/selftests/kvm/include/loongarch/processor.h index 374caddfb0db..a18ac7bff303 100644 --- a/tools/testing/selftests/kvm/include/loongarch/processor.h +++ b/tools/testing/selftests/kvm/include/loongarch/processor.h @@ -84,6 +84,11 @@ #define LOONGARCH_CSR_EUEN 0x2 #define LOONGARCH_CSR_ECFG 0x4 #define LOONGARCH_CSR_ESTAT 0x5 /* Exception status */ +#define CSR_ESTAT_EXC_SHIFT 16 +#define CSR_ESTAT_EXC_WIDTH 6 +#define CSR_ESTAT_EXC (0x3f << CSR_ESTAT_EXC_SHIFT) +#define EXCCODE_INT 0 /* Interrupt */ +#define INT_TI 11 /* Timer interrupt*/ #define LOONGARCH_CSR_ERA 0x6 /* ERA */ #define LOONGARCH_CSR_BADV 0x7 /* Bad virtual address */ #define LOONGARCH_CSR_EENTRY 0xc @@ -133,6 +138,15 @@ struct ex_regs { #define PRMD_OFFSET_EXREGS offsetof(struct ex_regs, prmd) #define EXREGS_SIZE sizeof(struct ex_regs)
+#define VECTOR_NUM 64 +typedef void(*handler_fn)(struct ex_regs *); +struct handlers { + handler_fn exception_handlers[VECTOR_NUM]; +}; + +void vm_init_descriptor_tables(struct kvm_vm *vm); +void vm_install_exception_handler(struct kvm_vm *vm, int vector, handler_fn handler); + #else #define PC_OFFSET_EXREGS ((EXREGS_GPRS + 0) * 8) #define ESTAT_OFFSET_EXREGS ((EXREGS_GPRS + 1) * 8) diff --git a/tools/testing/selftests/kvm/lib/loongarch/processor.c b/tools/testing/selftests/kvm/lib/loongarch/processor.c index 0ac1abcb71cb..be537c5ff74e 100644 --- a/tools/testing/selftests/kvm/lib/loongarch/processor.c +++ b/tools/testing/selftests/kvm/lib/loongarch/processor.c @@ -11,6 +11,7 @@ #define LOONGARCH_GUEST_STACK_VADDR_MIN 0x200000
static vm_paddr_t invalid_pgtable[4]; +static vm_vaddr_t exception_handlers;
static uint64_t virt_pte_index(struct kvm_vm *vm, vm_vaddr_t gva, int level) { @@ -184,6 +185,13 @@ void assert_on_unhandled_exception(struct kvm_vcpu *vcpu) void route_exception(struct ex_regs *regs) { unsigned long pc, estat, badv; + int vector; + struct handlers *handlers; + + handlers = (struct handlers *)exception_handlers; + vector = (regs->estat & CSR_ESTAT_EXC) >> CSR_ESTAT_EXC_SHIFT; + if (handlers && handlers->exception_handlers[vector]) + return handlers->exception_handlers[vector](regs);
pc = regs->pc; badv = regs->badv; @@ -192,6 +200,27 @@ void route_exception(struct ex_regs *regs) while (1) ; }
+void vm_init_descriptor_tables(struct kvm_vm *vm) +{ + void *addr; + + vm->handlers = __vm_vaddr_alloc(vm, sizeof(struct handlers), + LOONGARCH_GUEST_STACK_VADDR_MIN, MEM_REGION_DATA); + + addr = addr_gva2hva(vm, vm->handlers); + memset(addr, 0, vm->page_size); + exception_handlers = vm->handlers; + sync_global_to_guest(vm, exception_handlers); +} + +void vm_install_exception_handler(struct kvm_vm *vm, int vector, handler_fn handler) +{ + struct handlers *handlers = addr_gva2hva(vm, vm->handlers); + + assert(vector < VECTOR_NUM); + handlers->exception_handlers[vector] = handler; +} + void vcpu_args_set(struct kvm_vcpu *vcpu, unsigned int num, ...) { int i;