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From: Quentin Perret <qperret@google.com>
To: Andrew Scull <ascull@google.com>
Cc: kernel-team@android.com, maz@kernel.org, Dave.Martin@arm.com,
	catalin.marinas@arm.com, will@kernel.org,
	kvmarm@lists.cs.columbia.edu
Subject: Re: [PATCH 05/10] KVM: arm64: Track where vcpu FP state was last loaded
Date: Thu, 11 Mar 2021 10:37:28 +0000	[thread overview]
Message-ID: <YEny6LbBPmKpK95k@google.com> (raw)
In-Reply-To: <20210304115454.3597879-6-ascull@google.com>

On Thursday 04 Mar 2021 at 11:54:48 (+0000), 'Andrew Scull' via kernel-team wrote:
> Keep track of the cpu that a vcpu's FP state was last loaded onto. This
> information is needed in order to tell whether a vcpu's latest FP state
> is already loaded on a cpu to avoid unnecessary reloading.
> 
> The method follows the pattern used by thread_struct whereby an
> fpsimd_cpu field is added and updated when the state is loaded.
> 
> Signed-off-by: Andrew Scull <ascull@google.com>
> Cc: Dave Martin <Dave.Martin@arm.com>
> ---
>  arch/arm64/include/asm/kvm_host.h       | 1 +
>  arch/arm64/kvm/arm.c                    | 2 ++
>  arch/arm64/kvm/hyp/include/hyp/switch.h | 2 ++
>  3 files changed, 5 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index 8a559fa2f237..a01194371ae5 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -306,6 +306,7 @@ struct kvm_vcpu_arch {
>  	struct kvm_guest_debug_arch vcpu_debug_state;
>  	struct kvm_guest_debug_arch external_debug_state;
>  
> +	int fpsimd_cpu;
>  	struct user_fpsimd_state *host_fpsimd_state;	/* hyp VA */
>  
>  	struct {
> diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
> index e3edea8379f3..87141c8d63e6 100644
> --- a/arch/arm64/kvm/arm.c
> +++ b/arch/arm64/kvm/arm.c
> @@ -313,6 +313,8 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
>  
>  	vcpu->arch.mmu_page_cache.gfp_zero = __GFP_ZERO;
>  
> +	vcpu->arch.fpsimd_cpu = NR_CPUS;

Is this supposed to be an invalid CPU number? If so, then NR_CPUS + 1 ?

Thanks,
Quentin
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  reply	other threads:[~2021-03-11 10:37 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-04 11:54 [PATCH 00/10] FPSIMD restore bypass and protecting Andrew Scull
2021-03-04 11:54 ` [PATCH 01/10] KVM: arm64: Leave KVM_ARM64_DEBUG_DIRTY updates to the host Andrew Scull
2021-03-04 11:54 ` [PATCH 02/10] KVM: arm64: Synchronize vcpu FPSIMD in " Andrew Scull
2021-03-04 11:54 ` [PATCH 03/10] KVM: arm64: Unmap host task thread flags from hyp Andrew Scull
2021-03-04 11:54 ` [PATCH 04/10] KVM: arm64: Support smp_processor_id() in nVHE hyp Andrew Scull
2021-03-11 10:35   ` Quentin Perret
2021-03-12 11:20     ` Andrew Scull
2021-03-12 11:27       ` Andrew Scull
2021-03-04 11:54 ` [PATCH 05/10] KVM: arm64: Track where vcpu FP state was last loaded Andrew Scull
2021-03-11 10:37   ` Quentin Perret [this message]
2021-03-11 10:40     ` Quentin Perret
2021-03-04 11:54 ` [PATCH 06/10] KVM: arm64: Avoid needlessly reloading guest FP state Andrew Scull
2021-03-04 11:54 ` [PATCH 07/10] KVM: arm64: Separate host and hyp vcpu FP flags Andrew Scull
2021-03-04 11:54 ` [PATCH 08/10] KVM: arm64: Pass the arch run struct explicitly Andrew Scull
2021-03-04 11:54 ` [PATCH 09/10] KVM: arm64: Use hyp-private run struct in protected mode Andrew Scull
2021-03-04 11:54 ` [PATCH 10/10] RFC: KVM: arm64: Manage FPSIMD state at EL2 for protected vCPUs Andrew Scull

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