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