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Message-ID: <CAAhSdy10dC+_S5PZ=QziYqVJKHh6Gi6D0H0C7GSsxWdFVrTQjA@mail.gmail.com>
Date: Mon, 7 Nov 2022 08:31:01 +0530
From: Anup Patel <anup@...infault.org>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>,
Huacai Chen <chenhuacai@...nel.org>,
Aleksandar Markovic <aleksandar.qemu.devel@...il.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Janosch Frank <frankja@...ux.ibm.com>,
Claudio Imbrenda <imbrenda@...ux.ibm.com>,
Matthew Rosato <mjrosato@...ux.ibm.com>,
Eric Farman <farman@...ux.ibm.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
James Morse <james.morse@....com>,
Alexandru Elisei <alexandru.elisei@....com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Oliver Upton <oliver.upton@...ux.dev>,
Atish Patra <atishp@...shpatra.org>,
David Hildenbrand <david@...hat.com>, kvm@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
kvmarm@...ts.cs.columbia.edu, linux-mips@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org, kvm-riscv@...ts.infradead.org,
linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
linux-kernel@...r.kernel.org,
Isaku Yamahata <isaku.yamahata@...el.com>,
Fabiano Rosas <farosas@...ux.ibm.com>,
Michael Ellerman <mpe@...erman.id.au>,
Chao Gao <chao.gao@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
Yuan Yao <yuan.yao@...el.com>
Subject: Re: [PATCH 09/44] KVM: Drop arch hardware (un)setup hooks
On Thu, Nov 3, 2022 at 4:49 AM Sean Christopherson <seanjc@...gle.com> wrote:
>
> Drop kvm_arch_hardware_setup() and kvm_arch_hardware_unsetup() now that
> all implementations are nops.
>
> No functional change intended.
>
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
For KVM RISC-V:
Acked-by: Anup Patel <anup@...infault.org>
Thanks,
Anup
> ---
> arch/arm64/include/asm/kvm_host.h | 1 -
> arch/arm64/kvm/arm.c | 5 -----
> arch/mips/include/asm/kvm_host.h | 1 -
> arch/mips/kvm/mips.c | 5 -----
> arch/powerpc/include/asm/kvm_host.h | 1 -
> arch/powerpc/kvm/powerpc.c | 5 -----
> arch/riscv/include/asm/kvm_host.h | 1 -
> arch/riscv/kvm/main.c | 5 -----
> arch/s390/kvm/kvm-s390.c | 10 ----------
> arch/x86/kvm/x86.c | 10 ----------
> include/linux/kvm_host.h | 2 --
> virt/kvm/kvm_main.c | 7 -------
> 12 files changed, 53 deletions(-)
>
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index 45e2136322ba..5d5a887e63a5 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -859,7 +859,6 @@ static inline bool kvm_system_needs_idmapped_vectors(void)
>
> void kvm_arm_vcpu_ptrauth_trap(struct kvm_vcpu *vcpu);
>
> -static inline void kvm_arch_hardware_unsetup(void) {}
> static inline void kvm_arch_sync_events(struct kvm *kvm) {}
> static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
>
> diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
> index 94d33e296e10..2ee729f54ce0 100644
> --- a/arch/arm64/kvm/arm.c
> +++ b/arch/arm64/kvm/arm.c
> @@ -63,11 +63,6 @@ int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
> return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
> }
>
> -int kvm_arch_hardware_setup(void *opaque)
> -{
> - return 0;
> -}
> -
> int kvm_arch_check_processor_compat(void *opaque)
> {
> return 0;
> diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
> index 5cedb28e8a40..28f0ba97db71 100644
> --- a/arch/mips/include/asm/kvm_host.h
> +++ b/arch/mips/include/asm/kvm_host.h
> @@ -888,7 +888,6 @@ extern unsigned long kvm_mips_get_ramsize(struct kvm *kvm);
> extern int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
> struct kvm_mips_interrupt *irq);
>
> -static inline void kvm_arch_hardware_unsetup(void) {}
> static inline void kvm_arch_sync_events(struct kvm *kvm) {}
> static inline void kvm_arch_free_memslot(struct kvm *kvm,
> struct kvm_memory_slot *slot) {}
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index a25e0b73ee70..af29490d9740 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -135,11 +135,6 @@ void kvm_arch_hardware_disable(void)
> kvm_mips_callbacks->hardware_disable();
> }
>
> -int kvm_arch_hardware_setup(void *opaque)
> -{
> - return 0;
> -}
> -
> int kvm_arch_check_processor_compat(void *opaque)
> {
> return 0;
> diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> index caea15dcb91d..5d2c3a487e73 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -877,7 +877,6 @@ struct kvm_vcpu_arch {
> #define __KVM_HAVE_CREATE_DEVICE
>
> static inline void kvm_arch_hardware_disable(void) {}
> -static inline void kvm_arch_hardware_unsetup(void) {}
> static inline void kvm_arch_sync_events(struct kvm *kvm) {}
> static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {}
> static inline void kvm_arch_flush_shadow_all(struct kvm *kvm) {}
> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> index b850b0efa201..74ea5687ecbc 100644
> --- a/arch/powerpc/kvm/powerpc.c
> +++ b/arch/powerpc/kvm/powerpc.c
> @@ -441,11 +441,6 @@ int kvm_arch_hardware_enable(void)
> return 0;
> }
>
> -int kvm_arch_hardware_setup(void *opaque)
> -{
> - return 0;
> -}
> -
> int kvm_arch_check_processor_compat(void *opaque)
> {
> return kvmppc_core_check_processor_compat();
> diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h
> index dbbf43d52623..8c771fc4f5d2 100644
> --- a/arch/riscv/include/asm/kvm_host.h
> +++ b/arch/riscv/include/asm/kvm_host.h
> @@ -229,7 +229,6 @@ struct kvm_vcpu_arch {
> bool pause;
> };
>
> -static inline void kvm_arch_hardware_unsetup(void) {}
> static inline void kvm_arch_sync_events(struct kvm *kvm) {}
> static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
>
> diff --git a/arch/riscv/kvm/main.c b/arch/riscv/kvm/main.c
> index df2d8716851f..a146fa0ce4d2 100644
> --- a/arch/riscv/kvm/main.c
> +++ b/arch/riscv/kvm/main.c
> @@ -25,11 +25,6 @@ int kvm_arch_check_processor_compat(void *opaque)
> return 0;
> }
>
> -int kvm_arch_hardware_setup(void *opaque)
> -{
> - return 0;
> -}
> -
> int kvm_arch_hardware_enable(void)
> {
> unsigned long hideleg, hedeleg;
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 1aaee15211f2..7fcd2d3b3558 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -321,16 +321,6 @@ static struct notifier_block kvm_clock_notifier = {
> .notifier_call = kvm_clock_sync,
> };
>
> -int kvm_arch_hardware_setup(void *opaque)
> -{
> - return 0;
> -}
> -
> -void kvm_arch_hardware_unsetup(void)
> -{
> -
> -}
> -
> static void allow_cpu_feat(unsigned long nr)
> {
> set_bit_inv(nr, kvm_s390_available_cpu_feat);
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 80ee580a9cd4..40d4bfaa17a4 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -11985,16 +11985,6 @@ void kvm_arch_hardware_disable(void)
> drop_user_return_notifiers();
> }
>
> -int kvm_arch_hardware_setup(void *opaque)
> -{
> - return 0;
> -}
> -
> -void kvm_arch_hardware_unsetup(void)
> -{
> -
> -}
> -
> int kvm_arch_check_processor_compat(void *opaque)
> {
> struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 18592bdf4c1b..9b52bd40be56 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1447,8 +1447,6 @@ static inline void kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu) {}
>
> int kvm_arch_hardware_enable(void);
> void kvm_arch_hardware_disable(void);
> -int kvm_arch_hardware_setup(void *opaque);
> -void kvm_arch_hardware_unsetup(void);
> int kvm_arch_check_processor_compat(void *opaque);
> int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
> bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu);
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index f592dd4ce8f2..27ce263a80e4 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -5843,10 +5843,6 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
> if (r)
> return r;
>
> - r = kvm_arch_hardware_setup(opaque);
> - if (r < 0)
> - goto err_hw_setup;
> -
> if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
> r = -ENOMEM;
> goto err_hw_enabled;
> @@ -5939,8 +5935,6 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
> out_free_2:
> free_cpumask_var(cpus_hardware_enabled);
> err_hw_enabled:
> - kvm_arch_hardware_unsetup();
> -err_hw_setup:
> kvm_arch_exit();
> return r;
> }
> @@ -5969,7 +5963,6 @@ void kvm_exit(void)
> on_each_cpu(hardware_disable_nolock, NULL, 1);
> kvm_irqfd_exit();
> free_cpumask_var(cpus_hardware_enabled);
> - kvm_arch_hardware_unsetup();
> kvm_arch_exit();
> }
> EXPORT_SYMBOL_GPL(kvm_exit);
> --
> 2.38.1.431.g37b22c650d-goog
>
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