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Date: Fri, 16 Jun 2023 10:39:13 +0800
From: zhaotianrui <zhaotianrui@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
Paolo Bonzini <pbonzini@...hat.com>,
WANG Xuerui <kernel@...0n.name>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
loongarch@...ts.linux.dev, Jens Axboe <axboe@...nel.dk>,
Mark Brown <broonie@...nel.org>,
Alex Deucher <alexander.deucher@....com>,
Oliver Upton <oliver.upton@...ux.dev>, maobibo@...ngson.cn,
Xi Ruoyao <xry111@...111.site>, tangyouling@...ngson.cn
Subject: Re: [PATCH v13 29/30] LoongArch: KVM: Supplement kvm document about
LoongArch-specific part
在 2023/6/15 下午5:42, Huacai Chen 写道:
> Hi, Tianrui,
>
> On Fri, Jun 9, 2023 at 5:09 PM Tianrui Zhao <zhaotianrui@...ngson.cn> 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@...ngson.cn>
>> ---
>> 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..ad8e13eab48d 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 {
> Add a " /* out (KVM_GET_REGS) / in (KVM_SET_REGS) */" line as others here?
Thanks, I will add this comment here.
Tianrui Zhao
>> + 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;
> Maybe use pad1 as x86 is better.
>
> Huacai
Thanks, this 'none' variable is meaningless, and I will remove it. As
this have already been removed in the actually kvm_fpu structure.
Tianrui Zhao
>> + __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;
I will also remove this 'none' variable.
Tianrui Zhao
>> + __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, only the KVM_MP_STATE_RUNNABLE state is 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, only the KVM_MP_STATE_RUNNABLE state is used to reflect
>> +whether the vcpu is runnable.
>> +
>> 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
>> --------------------
>> --
>> 2.39.1
>>
>>
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