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Subject[PATCH 3/4] KVM: riscv: selftests: Add guest helper to get vcpu id
Date
Add guest_get_vcpuid() helper to simplify accessing to per-cpu
private data. The sscratch CSR was used to store the vcpu id.

Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
---
tools/testing/selftests/kvm/include/riscv/processor.h | 2 ++
tools/testing/selftests/kvm/lib/riscv/processor.c | 8 ++++++++
2 files changed, 10 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/riscv/processor.h b/tools/testing/selftests/kvm/include/riscv/processor.h
index 9ea6e7bedc61..ca53570ce6de 100644
--- a/tools/testing/selftests/kvm/include/riscv/processor.h
+++ b/tools/testing/selftests/kvm/include/riscv/processor.h
@@ -165,4 +165,6 @@ struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
unsigned long arg3, unsigned long arg4,
unsigned long arg5);

+uint32_t guest_get_vcpuid(void);
+
#endif /* SELFTEST_KVM_PROCESSOR_H */
diff --git a/tools/testing/selftests/kvm/lib/riscv/processor.c b/tools/testing/selftests/kvm/lib/riscv/processor.c
index f1b0be58a5dc..b8ad3e69a697 100644
--- a/tools/testing/selftests/kvm/lib/riscv/processor.c
+++ b/tools/testing/selftests/kvm/lib/riscv/processor.c
@@ -316,6 +316,9 @@ struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id,
vcpu_set_reg(vcpu, RISCV_CORE_REG(regs.sp), stack_vaddr + stack_size);
vcpu_set_reg(vcpu, RISCV_CORE_REG(regs.pc), (unsigned long)guest_code);

+ /* Setup scratch regiter of guest */
+ vcpu_set_reg(vcpu, RISCV_CSR_REG(sscratch), vcpu_id);
+
/* Setup default exception vector of guest */
vcpu_set_reg(vcpu, RISCV_CSR_REG(stvec), (unsigned long)guest_unexp_trap);

@@ -424,3 +427,8 @@ void vm_install_interrupt_handler(struct kvm_vm *vm, void (*handler)(struct ex_r

handlers->exception_handlers[1][0] = handler;
}
+
+uint32_t guest_get_vcpuid(void)
+{
+ return csr_read(CSR_SSCRATCH);
+}
--
2.34.1
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