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KVM: LoongArch: selftests: Add basic interfaces

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

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 985a96983b
commit 1c5d3a1eab
2 changed files with 55 additions and 0 deletions
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50
tools/testing/selftests/kvm/include/loongarch/processor.h
View File

@@ -113,6 +113,28 @@
#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__
@@ -133,6 +155,34 @@ struct ex_regs {
#define PRMD_OFFSET_EXREGS offsetof(struct ex_regs, prmd)
#define EXREGS_SIZE sizeof(struct ex_regs)
static inline void cpu_relax(void)
{
asm volatile("nop" ::: "memory");
}
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");
}
#else
#define PC_OFFSET_EXREGS ((EXREGS_GPRS + 0) * 8)
#define ESTAT_OFFSET_EXREGS ((EXREGS_GPRS + 1) * 8)

5
tools/testing/selftests/kvm/lib/loongarch/processor.c
View File

@@ -192,6 +192,11 @@ void route_exception(struct ex_regs *regs)
while (1) ;
}
uint32_t guest_get_vcpuid(void)
{
return csr_read(LOONGARCH_CSR_CPUID);
}
void vcpu_args_set(struct kvm_vcpu *vcpu, unsigned int num, ...)
{
int i;