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Message-ID: <e0826025-6925-fd94-1192-529c9aca1181@linux.alibaba.com>
Date: Mon, 27 Apr 2020 12:13:06 +0800
From: Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
To: Huacai Chen <chenhuacai@...il.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
paulus@...abs.org, mpe@...erman.id.au,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
borntraeger@...ibm.com, frankja@...ux.ibm.com, david@...hat.com,
cohuck@...hat.com, heiko.carstens@...ibm.com, gor@...ux.ibm.com,
sean.j.christopherson@...el.com, vkuznets@...hat.com,
wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
Thomas Gleixner <tglx@...utronix.de>, mingo@...hat.com,
Borislav Petkov <bp@...en8.de>, x86@...nel.org, hpa@...or.com,
Marc Zyngier <maz@...nel.org>, james.morse@....com,
julien.thierry.kdev@...il.com, suzuki.poulose@....com,
christoffer.dall@....com, Peter Xu <peterx@...hat.com>,
thuth@...hat.com, kvm@...r.kernel.org,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
kvmarm@...ts.cs.columbia.edu,
"open list:MIPS" <linux-mips@...r.kernel.org>,
kvm-ppc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
linux-s390@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 7/7] KVM: MIPS: clean up redundant kvm_run parameters
in assembly
On 2020/4/27 11:51, Huacai Chen wrote:
> Hi, Tianjia,
>
> On Sun, Apr 26, 2020 at 8:40 PM Tianjia Zhang
> <tianjia.zhang@...ux.alibaba.com> wrote:
>>
>> In the current kvm version, 'kvm_run' has been included in the 'kvm_vcpu'
>> structure. Earlier than historical reasons, many kvm-related function
>> parameters retain the 'kvm_run' and 'kvm_vcpu' parameters at the same time.
>> This patch does a unified cleanup of these remaining redundant parameters.
>>
>> Signed-off-by: Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
>> ---
>> arch/mips/include/asm/kvm_host.h | 4 ++--
>> arch/mips/kvm/entry.c | 15 +++++----------
>> arch/mips/kvm/mips.c | 3 ++-
>> arch/mips/kvm/trap_emul.c | 2 +-
>> arch/mips/kvm/vz.c | 2 +-
>> 5 files changed, 11 insertions(+), 15 deletions(-)
>>
>> diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
>> index 971439297cea..db915c55166d 100644
>> --- a/arch/mips/include/asm/kvm_host.h
>> +++ b/arch/mips/include/asm/kvm_host.h
>> @@ -310,7 +310,7 @@ struct kvm_mmu_memory_cache {
>> #define KVM_MIPS_GUEST_TLB_SIZE 64
>> struct kvm_vcpu_arch {
>> void *guest_ebase;
>> - int (*vcpu_run)(struct kvm_run *run, struct kvm_vcpu *vcpu);
>> + int (*vcpu_run)(struct kvm_vcpu *vcpu);
>>
>> /* Host registers preserved across guest mode execution */
>> unsigned long host_stack;
>> @@ -821,7 +821,7 @@ int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks);
>> /* Debug: dump vcpu state */
>> int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu);
>>
>> -extern int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu);
>> +extern int kvm_mips_handle_exit(struct kvm_vcpu *vcpu);
>>
>> /* Building of entry/exception code */
>> int kvm_mips_entry_setup(void);
>> diff --git a/arch/mips/kvm/entry.c b/arch/mips/kvm/entry.c
>> index 16e1c93b484f..e3f29af3b6cd 100644
>> --- a/arch/mips/kvm/entry.c
>> +++ b/arch/mips/kvm/entry.c
>> @@ -204,7 +204,7 @@ static inline void build_set_exc_base(u32 **p, unsigned int reg)
>> * Assemble the start of the vcpu_run function to run a guest VCPU. The function
>> * conforms to the following prototype:
>> *
>> - * int vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu);
>> + * int vcpu_run(struct kvm_vcpu *vcpu);
>> *
>> * The exit from the guest and return to the caller is handled by the code
>> * generated by kvm_mips_build_ret_to_host().
>> @@ -217,8 +217,7 @@ void *kvm_mips_build_vcpu_run(void *addr)
>> unsigned int i;
>>
>> /*
>> - * A0: run
>> - * A1: vcpu
>> + * A0: vcpu
>> */
>>
>> /* k0/k1 not being used in host kernel context */
>> @@ -237,10 +236,10 @@ void *kvm_mips_build_vcpu_run(void *addr)
>> kvm_mips_build_save_scratch(&p, V1, K1);
>>
>> /* VCPU scratch register has pointer to vcpu */
>> - UASM_i_MTC0(&p, A1, scratch_vcpu[0], scratch_vcpu[1]);
>> + UASM_i_MTC0(&p, A0, scratch_vcpu[0], scratch_vcpu[1]);
>>
>> /* Offset into vcpu->arch */
>> - UASM_i_ADDIU(&p, K1, A1, offsetof(struct kvm_vcpu, arch));
>> + UASM_i_ADDIU(&p, K1, A0, offsetof(struct kvm_vcpu, arch));
>>
>> /*
>> * Save the host stack to VCPU, used for exception processing
>> @@ -628,10 +627,7 @@ void *kvm_mips_build_exit(void *addr)
>> /* Now that context has been saved, we can use other registers */
>>
>> /* Restore vcpu */
>> - UASM_i_MFC0(&p, S1, scratch_vcpu[0], scratch_vcpu[1]);
>> -
>> - /* Restore run (vcpu->run) */
>> - UASM_i_LW(&p, S0, offsetof(struct kvm_vcpu, run), S1);
>> + UASM_i_MFC0(&p, S0, scratch_vcpu[0], scratch_vcpu[1]);
>>
>> /*
>> * Save Host level EPC, BadVaddr and Cause to VCPU, useful to process
>> @@ -793,7 +789,6 @@ void *kvm_mips_build_exit(void *addr)
>> * with this in the kernel
>> */
>> uasm_i_move(&p, A0, S0);
>> - uasm_i_move(&p, A1, S1);
>> UASM_i_LA(&p, T9, (unsigned long)kvm_mips_handle_exit);
>> uasm_i_jalr(&p, RA, T9);
>> UASM_i_ADDIU(&p, SP, SP, -CALLFRAME_SIZ);
> I think uasm_i_move(&p, K1, S1) in kvm_mips_build_ret_from_exit() and
> UASM_i_MTC0(&p, S1, scratch_vcpu[0], scratch_vcpu[1]) in
> kvm_mips_build_ret_to_guest() should also be changed.
>
Your statement is correct, this is my omission, I will fix it in the
next version of the patch, thanks for your review.
Thanks and best,
Tianjia
>> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
>> index 9710477a9827..32850470c037 100644
>> --- a/arch/mips/kvm/mips.c
>> +++ b/arch/mips/kvm/mips.c
>> @@ -1186,8 +1186,9 @@ static void kvm_mips_set_c0_status(void)
>> /*
>> * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
>> */
>> -int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
>> +int kvm_mips_handle_exit(struct kvm_vcpu *vcpu)
>> {
>> + struct kvm_run *run = vcpu->run;
>> u32 cause = vcpu->arch.host_cp0_cause;
>> u32 exccode = (cause >> CAUSEB_EXCCODE) & 0x1f;
>> u32 __user *opc = (u32 __user *) vcpu->arch.pc;
>> diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c
>> index d822f3aee3dc..04c864cc356a 100644
>> --- a/arch/mips/kvm/trap_emul.c
>> +++ b/arch/mips/kvm/trap_emul.c
>> @@ -1238,7 +1238,7 @@ static int kvm_trap_emul_vcpu_run(struct kvm_vcpu *vcpu)
>> */
>> kvm_mips_suspend_mm(cpu);
>>
>> - r = vcpu->arch.vcpu_run(vcpu->run, vcpu);
>> + r = vcpu->arch.vcpu_run(vcpu);
>>
>> /* We may have migrated while handling guest exits */
>> cpu = smp_processor_id();
>> diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c
>> index 94f1d23828e3..c5878fa0636d 100644
>> --- a/arch/mips/kvm/vz.c
>> +++ b/arch/mips/kvm/vz.c
>> @@ -3152,7 +3152,7 @@ static int kvm_vz_vcpu_run(struct kvm_vcpu *vcpu)
>> kvm_vz_vcpu_load_tlb(vcpu, cpu);
>> kvm_vz_vcpu_load_wired(vcpu);
>>
>> - r = vcpu->arch.vcpu_run(vcpu->run, vcpu);
>> + r = vcpu->arch.vcpu_run(vcpu);
>>
>> kvm_vz_vcpu_save_wired(vcpu);
>>
>> --
>> 2.17.1
>>
>
> Regards,
> Huacai
>
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