From: Huacai Chen <chenhuacai@gmail.com>
To: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Cc: wanpengli@tencent.com, kvm@vger.kernel.org, david@redhat.com,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
heiko.carstens@de.ibm.com,
"open list:MIPS" <linux-mips@vger.kernel.org>,
paulus@ozlabs.org, hpa@zytor.com, kvmarm@lists.cs.columbia.edu,
linux-s390@vger.kernel.org, frankja@linux.ibm.com,
Marc Zyngier <maz@kernel.org>,
joro@8bytes.org, x86@kernel.org, borntraeger@de.ibm.com,
mingo@redhat.com, thuth@redhat.com, gor@linux.ibm.com,
kvm-ppc@vger.kernel.org, Borislav Petkov <bp@alien8.de>,
Thomas Gleixner <tglx@linutronix.de>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
jmattson@google.com,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
cohuck@redhat.com, sean.j.christopherson@intel.com,
LKML <linux-kernel@vger.kernel.org>,
mpe@ellerman.id.au, Paolo Bonzini <pbonzini@redhat.com>,
vkuznets@redhat.com, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v4 7/7] KVM: MIPS: clean up redundant kvm_run parameters in assembly
Date: Mon, 27 Apr 2020 13:36:16 +0800 [thread overview]
Message-ID: <CAAhV-H5vifJfV+HjJS2UpW-56tdsXFA6VYhaf3xi92POxuPTyg@mail.gmail.com> (raw)
In-Reply-To: <20200427043514.16144-8-tianjia.zhang@linux.alibaba.com>
Reviewed-by: Huacai Chen <chenhc@lemote.com>
On Mon, Apr 27, 2020 at 12:35 PM Tianjia Zhang
<tianjia.zhang@linux.alibaba.com> wrote:
>
> In the current kvm version, 'kvm_run' has been included in the 'kvm_vcpu'
> structure. For 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@linux.alibaba.com>
> ---
> arch/mips/include/asm/kvm_host.h | 4 ++--
> arch/mips/kvm/entry.c | 21 ++++++++-------------
> arch/mips/kvm/mips.c | 3 ++-
> arch/mips/kvm/trap_emul.c | 2 +-
> arch/mips/kvm/vz.c | 2 +-
> 5 files changed, 14 insertions(+), 18 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..1083f35361ea 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);
> @@ -835,7 +830,7 @@ static void *kvm_mips_build_ret_from_exit(void *addr)
> * guest, reload k1
> */
>
> - uasm_i_move(&p, K1, S1);
> + uasm_i_move(&p, K1, S0);
> UASM_i_ADDIU(&p, K1, K1, offsetof(struct kvm_vcpu, arch));
>
> /*
> @@ -869,8 +864,8 @@ static void *kvm_mips_build_ret_to_guest(void *addr)
> {
> u32 *p = addr;
>
> - /* Put the saved pointer to vcpu (s1) back into the scratch register */
> - UASM_i_MTC0(&p, S1, scratch_vcpu[0], scratch_vcpu[1]);
> + /* Put the saved pointer to vcpu (s0) back into the scratch register */
> + UASM_i_MTC0(&p, S0, scratch_vcpu[0], scratch_vcpu[1]);
>
> /* Load up the Guest EBASE to minimize the window where BEV is set */
> UASM_i_LW(&p, T0, offsetof(struct kvm_vcpu_arch, guest_ebase), K1);
> 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
>
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
next prev parent reply other threads:[~2020-04-27 9:40 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-27 4:35 [PATCH v4 0/7] clean up redundant 'kvm_run' parameters Tianjia Zhang
2020-04-27 4:35 ` [PATCH v4 1/7] KVM: s390: " Tianjia Zhang
2020-04-29 12:03 ` Vitaly Kuznetsov
2020-04-27 4:35 ` [PATCH v4 2/7] KVM: arm64: " Tianjia Zhang
2020-04-29 12:07 ` Vitaly Kuznetsov
2020-05-05 8:39 ` Marc Zyngier
2020-05-07 13:04 ` Tianjia Zhang
2020-04-27 4:35 ` [PATCH v4 3/7] KVM: PPC: Remove redundant kvm_run from vcpu_arch Tianjia Zhang
2020-04-29 12:23 ` Vitaly Kuznetsov
2020-05-26 4:36 ` Paul Mackerras
2020-05-27 4:20 ` Paul Mackerras
2020-05-27 5:23 ` Tianjia Zhang
2020-04-27 4:35 ` [PATCH v4 4/7] KVM: PPC: clean up redundant 'kvm_run' parameters Tianjia Zhang
2020-04-29 12:32 ` Vitaly Kuznetsov
2020-05-26 5:49 ` Paul Mackerras
2020-04-27 4:35 ` [PATCH v4 5/7] KVM: PPC: clean up redundant kvm_run parameters in assembly Tianjia Zhang
2020-05-26 5:59 ` Paul Mackerras
2020-07-13 3:07 ` Tianjia Zhang
2020-04-27 4:35 ` [PATCH v4 6/7] KVM: MIPS: clean up redundant 'kvm_run' parameters Tianjia Zhang
2020-04-27 5:40 ` Huacai Chen
2020-05-27 6:24 ` Tianjia Zhang
2020-05-29 9:48 ` Paolo Bonzini
2020-06-16 11:54 ` Tianjia Zhang
2020-04-27 4:35 ` [PATCH v4 7/7] KVM: MIPS: clean up redundant kvm_run parameters in assembly Tianjia Zhang
2020-04-27 5:36 ` Huacai Chen [this message]
2020-05-05 4:15 ` [PATCH v4 0/7] clean up redundant 'kvm_run' parameters Tianjia Zhang
2020-06-23 9:42 ` Paolo Bonzini
2020-06-23 10:00 ` Tianjia Zhang
2020-06-23 10:24 ` Paolo Bonzini
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAAhV-H5vifJfV+HjJS2UpW-56tdsXFA6VYhaf3xi92POxuPTyg@mail.gmail.com \
--to=chenhuacai@gmail.com \
--cc=benh@kernel.crashing.org \
--cc=borntraeger@de.ibm.com \
--cc=bp@alien8.de \
--cc=cohuck@redhat.com \
--cc=david@redhat.com \
--cc=frankja@linux.ibm.com \
--cc=gor@linux.ibm.com \
--cc=heiko.carstens@de.ibm.com \
--cc=hpa@zytor.com \
--cc=jmattson@google.com \
--cc=joro@8bytes.org \
--cc=kvm-ppc@vger.kernel.org \
--cc=kvm@vger.kernel.org \
--cc=kvmarm@lists.cs.columbia.edu \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=maz@kernel.org \
--cc=mingo@redhat.com \
--cc=mpe@ellerman.id.au \
--cc=paulus@ozlabs.org \
--cc=pbonzini@redhat.com \
--cc=sean.j.christopherson@intel.com \
--cc=tglx@linutronix.de \
--cc=thuth@redhat.com \
--cc=tianjia.zhang@linux.alibaba.com \
--cc=tsbogend@alpha.franken.de \
--cc=vkuznets@redhat.com \
--cc=wanpengli@tencent.com \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).