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@xxxxxxxxxx>
> Cc: Dave Martin <Dave.Martin@xxxxxxx>
> ---
> 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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