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KVM: LoongArch: selftests: Add exception handler register interface

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Add interrupt and exception handler register interface. When exception
happens, execute registered exception handler if exists, else report an
error.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Bibo Mao
2025-11-27 11:00:18 +08:00
committed by Huacai Chen
parent 1c5d3a1eab
commit d84fe2f30b
2 changed files with 45 additions and 0 deletions
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16
tools/testing/selftests/kvm/include/loongarch/processor.h
View File

@@ -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
@@ -155,6 +160,17 @@ 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);
static inline void cpu_relax(void)
{
asm volatile("nop" ::: "memory");

29
tools/testing/selftests/kvm/lib/loongarch/processor.c
View File

@@ -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)
{
@@ -183,7 +184,14 @@ void assert_on_unhandled_exception(struct kvm_vcpu *vcpu)
void route_exception(struct ex_regs *regs)
{
int vector;
unsigned long pc, estat, badv;
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;
}
uint32_t guest_get_vcpuid(void)
{
return csr_read(LOONGARCH_CSR_CPUID);