Hi Tianrui, Thank you for working on this. Only one small nit, please see below. On Tue, May 09 2023 at 03:53:46 PM +0800, Tianrui Zhao wrote: > Supplement kvm document about LoongArch-specific part, such as add > api introduction for GET/SET_ONE_REG, GET/SET_FPU, GET/SET_MP_STATE, > etc. > > Signed-off-by: Tianrui Zhao <zhaotianrui@xxxxxxxxxxx> > --- > Documentation/virt/kvm/api.rst | 71 +++++++++++++++++++++++++++++----- > 1 file changed, 62 insertions(+), 9 deletions(-) > > diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst > index add067793b90..ae7d6a2cd54f 100644 > --- a/Documentation/virt/kvm/api.rst > +++ b/Documentation/virt/kvm/api.rst > @@ -416,6 +416,12 @@ Reads the general purpose registers from the vcpu. > __u64 pc; > }; > > + /* LoongArch */ > + struct kvm_regs { > + unsigned long gpr[32]; > + unsigned long pc; > + }; > + > > 4.12 KVM_SET_REGS > ----------------- > @@ -506,7 +512,7 @@ translation mode. > ------------------ > > :Capability: basic > -:Architectures: x86, ppc, mips, riscv > +:Architectures: x86, ppc, mips, riscv, loongarch > :Type: vcpu ioctl > :Parameters: struct kvm_interrupt (in) > :Returns: 0 on success, negative on failure. > @@ -592,6 +598,14 @@ b) KVM_INTERRUPT_UNSET > > This is an asynchronous vcpu ioctl and can be invoked from any thread. > > +LOONGARCH: > +^^^^^^^^^^ > + > +Queues an external interrupt to be injected into the virtual CPU. A negative > +interrupt number dequeues the interrupt. > + > +This is an asynchronous vcpu ioctl and can be invoked from any thread. > + > > 4.17 KVM_DEBUG_GUEST > -------------------- > @@ -737,7 +751,7 @@ signal mask. > ---------------- > > :Capability: basic > -:Architectures: x86 > +:Architectures: x86, loongarch > :Type: vcpu ioctl > :Parameters: struct kvm_fpu (out) > :Returns: 0 on success, -1 on error > @@ -746,7 +760,7 @@ Reads the floating point state from the vcpu. > > :: > > - /* for KVM_GET_FPU and KVM_SET_FPU */ > + /* x86: for KVM_GET_FPU and KVM_SET_FPU */ > struct kvm_fpu { > __u8 fpr[8][16]; > __u16 fcw; > @@ -761,12 +775,22 @@ Reads the floating point state from the vcpu. > __u32 pad2; > }; > > + /* LoongArch: for KVM_GET_FPU and KVM_SET_FPU */ > + struct kvm_fpu { > + __u32 fcsr; > + __u32 none; > + __u64 fcc; > + struct kvm_fpureg { > + __u64 val64[4]; > + }fpr[32]; > + }; > + > > 4.23 KVM_SET_FPU > ---------------- > > :Capability: basic > -:Architectures: x86 > +:Architectures: x86, loongarch > :Type: vcpu ioctl > :Parameters: struct kvm_fpu (in) > :Returns: 0 on success, -1 on error > @@ -775,7 +799,7 @@ Writes the floating point state to the vcpu. > > :: > > - /* for KVM_GET_FPU and KVM_SET_FPU */ > + /* x86: for KVM_GET_FPU and KVM_SET_FPU */ > struct kvm_fpu { > __u8 fpr[8][16]; > __u16 fcw; > @@ -790,6 +814,16 @@ Writes the floating point state to the vcpu. > __u32 pad2; > }; > > + /* LoongArch: for KVM_GET_FPU and KVM_SET_FPU */ > + struct kvm_fpu { > + __u32 fcsr; > + __u32 none; > + __u64 fcc; > + struct kvm_fpureg { > + __u64 val64[4]; > + }fpr[32]; > + }; > + > > 4.24 KVM_CREATE_IRQCHIP > ----------------------- > @@ -1387,7 +1421,7 @@ documentation when it pops into existence). > ------------------- > > :Capability: KVM_CAP_ENABLE_CAP > -:Architectures: mips, ppc, s390, x86 > +:Architectures: mips, ppc, s390, x86, loongarch > :Type: vcpu ioctl > :Parameters: struct kvm_enable_cap (in) > :Returns: 0 on success; -1 on error > @@ -1442,7 +1476,7 @@ for vm-wide capabilities. > --------------------- > > :Capability: KVM_CAP_MP_STATE > -:Architectures: x86, s390, arm64, riscv > +:Architectures: x86, s390, arm64, riscv, loongarch > :Type: vcpu ioctl > :Parameters: struct kvm_mp_state (out) > :Returns: 0 on success; -1 on error > @@ -1460,7 +1494,7 @@ Possible values are: > > ========================== =============================================== > KVM_MP_STATE_RUNNABLE the vcpu is currently running > - [x86,arm64,riscv] > + [x86,arm64,riscv,loongarch] > KVM_MP_STATE_UNINITIALIZED the vcpu is an application processor (AP) > which has not yet received an INIT signal [x86] > KVM_MP_STATE_INIT_RECEIVED the vcpu has received an INIT signal, and is > @@ -1516,11 +1550,14 @@ For riscv: > The only states that are valid are KVM_MP_STATE_STOPPED and > KVM_MP_STATE_RUNNABLE which reflect if the vcpu is paused or not. > > +On LoongArch, the KVM_MP_STATE_RUNNABLE state is only used which reflect the > +vcpu is runnable. There seems to be a grammatical error here. The original sentence uses "which" to connect two clauses, but lacks a subject to introduce the second clause. I think we should correct it like this, "On LoongArch, the KVM_MP_STATE_RUNNABLE state is only used to reflect whether the vcpu is runnable." > + > 4.39 KVM_SET_MP_STATE > --------------------- > > :Capability: KVM_CAP_MP_STATE > -:Architectures: x86, s390, arm64, riscv > +:Architectures: x86, s390, arm64, riscv, loongarch > :Type: vcpu ioctl > :Parameters: struct kvm_mp_state (in) > :Returns: 0 on success; -1 on error > @@ -1538,6 +1575,9 @@ For arm64/riscv: > The only states that are valid are KVM_MP_STATE_STOPPED and > KVM_MP_STATE_RUNNABLE which reflect if the vcpu should be paused or not. > > +On LoongArch, the KVM_MP_STATE_RUNNABLE state is only used which reflect the > +vcpu is runnable. Likewise here. WDYT? Thanks, Enze > + > 4.40 KVM_SET_IDENTITY_MAP_ADDR > ------------------------------ > > @@ -2839,6 +2879,19 @@ Following are the RISC-V D-extension registers: > 0x8020 0000 0600 0020 fcsr Floating point control and status register > ======================= ========= ============================================= > > +LoongArch registers are mapped using the lower 32 bits. The upper 16 bits of > +that is the register group type. > + > +LoongArch csr registers are used to control guest cpu or get status of guest > +cpu, and they have the following id bit patterns:: > + > + 0x9030 0000 0001 00 <reg:5> <sel:3> (64-bit) > + > +LoongArch KVM control registers are used to implement some new defined functions > +such as set vcpu counter or reset vcpu, and they have the following id bit patterns:: > + > + 0x9030 0000 0002 <reg:16> > + > > 4.69 KVM_GET_ONE_REG > --------------------