Hi, Bibo,

On Tue, Nov 4, 2025 at 7:37 PM Bibo Mao maobibo@loongson.cn wrote:

Add some basic function interfaces such as CSR register access, local irq enable or disable APIs.

This is "basic interfaces", so better to be before Patch-2 (or keep the order but change the subject)?

Huacai

Signed-off-by: Bibo Mao maobibo@loongson.cn

.../kvm/include/loongarch/processor.h | 52 +++++++++++++++++++ .../selftests/kvm/lib/loongarch/processor.c | 5 ++ 2 files changed, 57 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/loongarch/processor.h b/tools/testing/selftests/kvm/include/loongarch/processor.h index a18ac7bff303..b027f8f4dac7 100644 --- a/tools/testing/selftests/kvm/include/loongarch/processor.h +++ b/tools/testing/selftests/kvm/include/loongarch/processor.h @@ -118,6 +118,28 @@ #define CSR_TLBREHI_PS_SHIFT 0 #define CSR_TLBREHI_PS (0x3fUL << CSR_TLBREHI_PS_SHIFT)

+#define csr_read(csr) \ +({ \

•   register unsigned long __v;             \
  

•   __asm__ __volatile__(                   \
  

•           "csrrd %[val], %[reg]\n\t"      \
  

•           : [val] "=r" (__v)              \
  

•           : [reg] "i" (csr)               \
  

•           : "memory");                    \
  

•   __v;                                    \
  

+})

+#define csr_write(v, csr) \ +({ \

•   register unsigned long __v = v;         \
  

•   __asm__ __volatile__ (                  \
  

•           "csrwr %[val], %[reg]\n\t"      \
  

•           : [val] "+r" (__v)              \
  

•           : [reg] "i" (csr)               \
  

•           : "memory");                    \
  

•   __v;                                    \
  

+})

#define EXREGS_GPRS (32)

#ifndef __ASSEMBLER__ @@ -147,6 +169,36 @@ struct handlers { 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 local_irq_enable(void) +{

•   unsigned int flags = CSR_CRMD_IE;
  

•   register unsigned int mask asm("$t0") = CSR_CRMD_IE;
  

•   __asm__ __volatile__(
  

•           "csrxchg %[val], %[mask], %[reg]\n\t"
  

•           : [val] "+r" (flags)
  

•           : [mask] "r" (mask), [reg] "i" (LOONGARCH_CSR_CRMD)
  

•           : "memory");
  

+}

+static inline void local_irq_disable(void) +{

•   unsigned int flags = 0;
  

•   register unsigned int mask asm("$t0") = CSR_CRMD_IE;
  

•   __asm__ __volatile__(
  

•           "csrxchg %[val], %[mask], %[reg]\n\t"
  

•           : [val] "+r" (flags)
  

•           : [mask] "r" (mask), [reg] "i" (LOONGARCH_CSR_CRMD)
  

•           : "memory");
  

+}

+static inline void cpu_relax(void) +{

•   asm volatile("nop" ::: "memory");
  

+} #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 be537c5ff74e..20ba476ccb72 100644 --- a/tools/testing/selftests/kvm/lib/loongarch/processor.c +++ b/tools/testing/selftests/kvm/lib/loongarch/processor.c @@ -373,3 +373,8 @@ void vcpu_arch_set_entry_point(struct kvm_vcpu *vcpu, void *guest_code) regs.pc = (uint64_t)guest_code; vcpu_regs_set(vcpu, &regs); }

+uint32_t guest_get_vcpuid(void) +{

•   return csr_read(LOONGARCH_CSR_CPUID);
  

+}

2.39.3