On Fri, Jul 28, 2023 at 5:49 PM Andrew Jones <ajones@xxxxxxxxxxxxxxxx> wrote:
>
> On Thu, Jul 27, 2023 at 03:20:07PM +0800, Haibo Xu wrote:
> > 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@xxxxxxxxx>
> > ---
> > 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);
>
> I'd also put this prototype somewhere common.
>
> > +
> > #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 */
>
> typo: register
>
> The comment above is pretty useless since it just states what the code
> states, but with even less information, since it doesn't state how the
> sscratch register is getting set up. I'd either drop it or write it
> as
>
> /* Setup sscratch for guest_get_vcpuid() */
>
> > + 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
> >
>
Sure! will fix them in v2.
Thanks,
Haibo
> Thanks,
> drew
