On Fri, May 12, 2023 at 12:40 AM Andrew Jones <ajones@xxxxxxxxxxxxxxxx> wrote: > > On Thu, May 11, 2023 at 05:22:48PM +0800, Haibo Xu wrote: > > KVM_GET_REG_LIST API will return all registers that are available to > > KVM_GET/SET_ONE_REG APIs. It's very useful to identify some platform > > regression issue during VM migration. > > > > Since this API was already supported on arm64, it'd be straightforward > > to enable it on riscv with similar code structure. > > > > Signed-off-by: Haibo Xu <haibo1.xu@xxxxxxxxx> > > --- > > Documentation/virt/kvm/api.rst | 2 +- > > arch/riscv/kvm/vcpu.c | 346 +++++++++++++++++++++++++++++++++ > > 2 files changed, 347 insertions(+), 1 deletion(-) > > > > diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst > > index add067793b90..280e89abd004 100644 > > --- a/Documentation/virt/kvm/api.rst > > +++ b/Documentation/virt/kvm/api.rst > > @@ -3499,7 +3499,7 @@ VCPU matching underlying host. > > --------------------- > > > > :Capability: basic > > -:Architectures: arm64, mips > > +:Architectures: arm64, mips, riscv > > :Type: vcpu ioctl > > :Parameters: struct kvm_reg_list (in/out) > > :Returns: 0 on success; -1 on error > > diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c > > index 8bd9f2a8a0b9..fb8834e4fa15 100644 > > --- a/arch/riscv/kvm/vcpu.c > > +++ b/arch/riscv/kvm/vcpu.c > > @@ -657,6 +657,334 @@ static int kvm_riscv_vcpu_set_reg_isa_ext(struct kvm_vcpu *vcpu, > > return 0; > > } > > > > +static inline unsigned long num_config_regs(void) > > +{ > > + return sizeof(struct kvm_riscv_config) / sizeof(unsigned long); > > We can't assume all config registers are present. For example, > zicbom and zicboz block size registers are only present when their > respective extensions are available. > > Thanks, > drew Yes, I will filter out these kinds of registers in the next version. Thanks, Haibo