On Sat, May 28, 2022 at 4:38 AM Marc Zyngier <maz@xxxxxxxxxx> wrote:
>
> The KVM_ARM64_{GUEST_HAS_SVE,VCPU_SVE_FINALIZED,GUEST_HAS_PTRAUTH}
> flags are purely configuration flags. Once set, they are never cleared,
> but evaluated all over the code base.
>
> Move these three flags into the configuration set in one go, using
> the new accessors, and take this opportunity to drop the KVM_ARM64_
> prefix which doesn't provide any help.
>
> Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
> ---
> arch/arm64/include/asm/kvm_host.h | 17 ++++++++++-------
> arch/arm64/kvm/reset.c | 6 +++---
> 2 files changed, 13 insertions(+), 10 deletions(-)
>
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index c9dd0d4e22f2..2b8f1265eade 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -459,6 +459,13 @@ struct kvm_vcpu_arch {
> #define __flag_unpack(_set, _f, _m) _f
> #define vcpu_flag_unpack(...) __flag_unpack(__VA_ARGS__)
>
> +/* SVE exposed to guest */
> +#define GUEST_HAS_SVE __vcpu_single_flag(cflags, BIT(0))
> +/* SVE config completed */
> +#define VCPU_SVE_FINALIZED __vcpu_single_flag(cflags, BIT(1))
> +/* PTRAUTH exposed to guest */
> +#define GUEST_HAS_PTRAUTH __vcpu_single_flag(cflags, BIT(2))
> +
>
> /* Pointer to the vcpu's SVE FFR for sve_{save,load}_state() */
> #define vcpu_sve_pffr(vcpu) (kern_hyp_va((vcpu)->arch.sve_state) + \
> @@ -483,9 +490,6 @@ struct kvm_vcpu_arch {
> /* vcpu_arch flags field values: */
> #define KVM_ARM64_DEBUG_DIRTY (1 << 0)
> #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 KVM_ARM64_VCPU_SVE_FINALIZED (1 << 6) /* SVE config completed */
> -#define KVM_ARM64_GUEST_HAS_PTRAUTH (1 << 7) /* PTRAUTH exposed to guest */
> #define KVM_ARM64_PENDING_EXCEPTION (1 << 8) /* Exception pending */
> /*
> * Overlaps with KVM_ARM64_EXCEPT_MASK on purpose so that it can't be
> @@ -522,13 +526,13 @@ struct kvm_vcpu_arch {
> KVM_GUESTDBG_SINGLESTEP)
>
> #define vcpu_has_sve(vcpu) (system_supports_sve() && \
> - ((vcpu)->arch.flags & KVM_ARM64_GUEST_HAS_SVE))
> + vcpu_get_flag((vcpu), GUEST_HAS_SVE))
Minor nit: The parentheses around the vcpu above would be unnecessary.
(as was omitted for vcpu_has_ptrauth/kvm_arm_vcpu_sve_finalized)
Reviewed-by: Reiji Watanabe <reijiw@xxxxxxxxxx>
The new infrastructure for those flags looks nice.
Thanks!
Reiji
>
> #ifdef CONFIG_ARM64_PTR_AUTH
> #define vcpu_has_ptrauth(vcpu) \
> ((cpus_have_final_cap(ARM64_HAS_ADDRESS_AUTH) || \
> cpus_have_final_cap(ARM64_HAS_GENERIC_AUTH)) && \
> - (vcpu)->arch.flags & KVM_ARM64_GUEST_HAS_PTRAUTH)
> + vcpu_get_flag(vcpu, GUEST_HAS_PTRAUTH))
> #else
> #define vcpu_has_ptrauth(vcpu) false
> #endif
> @@ -885,8 +889,7 @@ void kvm_init_protected_traps(struct kvm_vcpu *vcpu);
> int kvm_arm_vcpu_finalize(struct kvm_vcpu *vcpu, int feature);
> bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu);
>
> -#define kvm_arm_vcpu_sve_finalized(vcpu) \
> - ((vcpu)->arch.flags & KVM_ARM64_VCPU_SVE_FINALIZED)
> +#define kvm_arm_vcpu_sve_finalized(vcpu) vcpu_get_flag(vcpu, VCPU_SVE_FINALIZED)
>
> #define kvm_has_mte(kvm) \
> (system_supports_mte() && \
> diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
> index 6c70c6f61c70..0e08fbe68715 100644
> --- a/arch/arm64/kvm/reset.c
> +++ b/arch/arm64/kvm/reset.c
> @@ -81,7 +81,7 @@ static int kvm_vcpu_enable_sve(struct kvm_vcpu *vcpu)
> * KVM_REG_ARM64_SVE_VLS. Allocation is deferred until
> * kvm_arm_vcpu_finalize(), which freezes the configuration.
> */
> - vcpu->arch.flags |= KVM_ARM64_GUEST_HAS_SVE;
> + vcpu_set_flag(vcpu, GUEST_HAS_SVE);
>
> return 0;
> }
> @@ -120,7 +120,7 @@ static int kvm_vcpu_finalize_sve(struct kvm_vcpu *vcpu)
> }
>
> vcpu->arch.sve_state = buf;
> - vcpu->arch.flags |= KVM_ARM64_VCPU_SVE_FINALIZED;
> + vcpu_set_flag(vcpu, VCPU_SVE_FINALIZED);
> return 0;
> }
>
> @@ -177,7 +177,7 @@ static int kvm_vcpu_enable_ptrauth(struct kvm_vcpu *vcpu)
> !system_has_full_ptr_auth())
> return -EINVAL;
>
> - vcpu->arch.flags |= KVM_ARM64_GUEST_HAS_PTRAUTH;
> + vcpu_set_flag(vcpu, GUEST_HAS_PTRAUTH);
> return 0;
> }
>
> --
> 2.34.1
>
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