Dave Martin <Dave.Martin@xxxxxxx> writes:
> Since SVE will be enabled or disabled on a per-vcpu basis, a flag
> is needed in order to track which vcpus have it enabled.
>
> This patch adds a suitable flag and a helper for checking it.
>
> Signed-off-by: Dave Martin <Dave.Martin@xxxxxxx>
Reviewed-by: Alex Bennée <alex.bennee@xxxxxxxxxx>
> ---
>
> Changes since RFCv1:
>
> * Convert vcpu_has_sve() to a macro so that it can operate on a vcpu
> without circular header dependency problems.
>
> This avoids the helper requiring a vcpu_arch argument, which was
> a little ugly.
> ---
> arch/arm64/include/asm/kvm_host.h | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index d4b65414..20baf4a 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -307,6 +307,10 @@ struct kvm_vcpu_arch {
> #define KVM_ARM64_FP_HOST (1 << 2) /* host FP regs loaded */
> #define KVM_ARM64_HOST_SVE_IN_USE (1 << 3) /* backup for host TIF_SVE */
> #define KVM_ARM64_HOST_SVE_ENABLED (1 << 4) /* SVE enabled for EL0 */
> +#define KVM_ARM64_GUEST_HAS_SVE (1 << 5) /* SVE exposed to guest */
> +
> +#define vcpu_has_sve(vcpu) (system_supports_sve() && \
> + ((vcpu)->arch.flags & KVM_ARM64_GUEST_HAS_SVE))
>
> #define vcpu_gp_regs(v) (&(v)->arch.ctxt.gp_regs)
--
Alex Bennée
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