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Message-ID: <9ac02210-437e-befd-cea5-2bfc57c00ec2@redhat.com>
Date: Tue, 26 Apr 2022 14:37:27 +0800
From: Gavin Shan <gshan@...hat.com>
To: Raghavendra Rao Ananta <rananta@...gle.com>,
Marc Zyngier <maz@...nel.org>,
Andrew Jones <drjones@...hat.com>,
James Morse <james.morse@....com>,
Alexandru Elisei <alexandru.elisei@....com>,
Suzuki K Poulose <suzuki.poulose@....com>
Cc: kvm@...r.kernel.org, Catalin Marinas <catalin.marinas@....com>,
Peter Shier <pshier@...gle.com>, linux-kernel@...r.kernel.org,
Paolo Bonzini <pbonzini@...hat.com>,
Will Deacon <will@...nel.org>, kvmarm@...ts.cs.columbia.edu,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 3/9] KVM: arm64: Add standard hypervisor firmware
register
On 4/23/22 8:03 AM, Raghavendra Rao Ananta wrote:
> Introduce the firmware register to hold the standard hypervisor
> service calls (owner value 5) as a bitmap. The bitmap represents
> the features that'll be enabled for the guest, as configured by
> the user-space. Currently, this includes support only for
> Paravirtualized time, represented by bit-0.
>
> Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>
> ---
> arch/arm64/include/asm/kvm_host.h | 2 ++
> arch/arm64/include/uapi/asm/kvm.h | 3 +++
> arch/arm64/kvm/hypercalls.c | 21 ++++++++++++++++++---
> include/kvm/arm_hypercalls.h | 2 ++
> 4 files changed, 25 insertions(+), 3 deletions(-)
>
Reviewed-by: Gavin Shan <gshan@...hat.com>
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index df07f4c10197..27d4b2a7970e 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -105,9 +105,11 @@ struct kvm_arch_memory_slot {
> * struct kvm_smccc_features: Descriptor the hypercall services exposed to the guests
> *
> * @std_bmap: Bitmap of standard secure service calls
> + * @std_hyp_bmap: Bitmap of standard hypervisor service calls
> */
> struct kvm_smccc_features {
> unsigned long std_bmap;
> + unsigned long std_hyp_bmap;
> };
>
> struct kvm_arch {
> diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
> index 0b79d2dc6ffd..9eecc7ee8c14 100644
> --- a/arch/arm64/include/uapi/asm/kvm.h
> +++ b/arch/arm64/include/uapi/asm/kvm.h
> @@ -341,6 +341,9 @@ struct kvm_arm_copy_mte_tags {
> #define KVM_REG_ARM_STD_BMAP KVM_REG_ARM_FW_FEAT_BMAP_REG(0)
> #define KVM_REG_ARM_STD_BIT_TRNG_V1_0 0
>
> +#define KVM_REG_ARM_STD_HYP_BMAP KVM_REG_ARM_FW_FEAT_BMAP_REG(1)
> +#define KVM_REG_ARM_STD_HYP_BIT_PV_TIME 0
> +
> /* Device Control API: ARM VGIC */
> #define KVM_DEV_ARM_VGIC_GRP_ADDR 0
> #define KVM_DEV_ARM_VGIC_GRP_DIST_REGS 1
> diff --git a/arch/arm64/kvm/hypercalls.c b/arch/arm64/kvm/hypercalls.c
> index df55a04d2fe8..f097bebdad39 100644
> --- a/arch/arm64/kvm/hypercalls.c
> +++ b/arch/arm64/kvm/hypercalls.c
> @@ -72,8 +72,6 @@ static bool kvm_hvc_call_default_allowed(struct kvm_vcpu *vcpu, u32 func_id)
> */
> case ARM_SMCCC_VERSION_FUNC_ID:
> case ARM_SMCCC_ARCH_FEATURES_FUNC_ID:
> - case ARM_SMCCC_HV_PV_TIME_FEATURES:
> - case ARM_SMCCC_HV_PV_TIME_ST:
> case ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID:
> case ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID:
> case ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID:
> @@ -95,6 +93,10 @@ static bool kvm_hvc_call_allowed(struct kvm_vcpu *vcpu, u32 func_id)
> case ARM_SMCCC_TRNG_RND64:
> return kvm_arm_fw_reg_feat_enabled(&smccc_feat->std_bmap,
> KVM_REG_ARM_STD_BIT_TRNG_V1_0);
> + case ARM_SMCCC_HV_PV_TIME_FEATURES:
> + case ARM_SMCCC_HV_PV_TIME_ST:
> + return kvm_arm_fw_reg_feat_enabled(&smccc_feat->std_hyp_bmap,
> + KVM_REG_ARM_STD_HYP_BIT_PV_TIME);
> default:
> return kvm_hvc_call_default_allowed(vcpu, func_id);
> }
> @@ -102,6 +104,7 @@ static bool kvm_hvc_call_allowed(struct kvm_vcpu *vcpu, u32 func_id)
>
> int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
> {
> + struct kvm_smccc_features *smccc_feat = &vcpu->kvm->arch.smccc_feat;
> u32 func_id = smccc_get_function(vcpu);
> u64 val[4] = {SMCCC_RET_NOT_SUPPORTED};
> u32 feature;
> @@ -165,7 +168,9 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
> }
> break;
> case ARM_SMCCC_HV_PV_TIME_FEATURES:
> - val[0] = SMCCC_RET_SUCCESS;
> + if (kvm_arm_fw_reg_feat_enabled(&smccc_feat->std_hyp_bmap,
> + KVM_REG_ARM_STD_HYP_BIT_PV_TIME))
> + val[0] = SMCCC_RET_SUCCESS;
> break;
> }
> break;
> @@ -211,6 +216,7 @@ static const u64 kvm_arm_fw_reg_ids[] = {
> KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2,
> KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3,
> KVM_REG_ARM_STD_BMAP,
> + KVM_REG_ARM_STD_HYP_BMAP,
> };
>
> void kvm_arm_init_hypercalls(struct kvm *kvm)
> @@ -218,6 +224,7 @@ void kvm_arm_init_hypercalls(struct kvm *kvm)
> struct kvm_smccc_features *smccc_feat = &kvm->arch.smccc_feat;
>
> smccc_feat->std_bmap = KVM_ARM_SMCCC_STD_FEATURES;
> + smccc_feat->std_hyp_bmap = KVM_ARM_SMCCC_STD_HYP_FEATURES;
> }
>
> int kvm_arm_get_fw_num_regs(struct kvm_vcpu *vcpu)
> @@ -307,6 +314,9 @@ int kvm_arm_get_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
> case KVM_REG_ARM_STD_BMAP:
> val = READ_ONCE(smccc_feat->std_bmap);
> break;
> + case KVM_REG_ARM_STD_HYP_BMAP:
> + val = READ_ONCE(smccc_feat->std_hyp_bmap);
> + break;
> default:
> return -ENOENT;
> }
> @@ -329,6 +339,10 @@ static int kvm_arm_set_fw_reg_bmap(struct kvm_vcpu *vcpu, u64 reg_id, u64 val)
> fw_reg_bmap = &smccc_feat->std_bmap;
> fw_reg_features = KVM_ARM_SMCCC_STD_FEATURES;
> break;
> + case KVM_REG_ARM_STD_HYP_BMAP:
> + fw_reg_bmap = &smccc_feat->std_hyp_bmap;
> + fw_reg_features = KVM_ARM_SMCCC_STD_HYP_FEATURES;
> + break;
> default:
> return -ENOENT;
> }
> @@ -430,6 +444,7 @@ int kvm_arm_set_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
>
> return 0;
> case KVM_REG_ARM_STD_BMAP:
> + case KVM_REG_ARM_STD_HYP_BMAP:
> return kvm_arm_set_fw_reg_bmap(vcpu, reg->id, val);
> default:
> return -ENOENT;
> diff --git a/include/kvm/arm_hypercalls.h b/include/kvm/arm_hypercalls.h
> index 499b45b607b6..aadd6ae3ab72 100644
> --- a/include/kvm/arm_hypercalls.h
> +++ b/include/kvm/arm_hypercalls.h
> @@ -8,8 +8,10 @@
>
> /* Last valid bits of the bitmapped firmware registers */
> #define KVM_REG_ARM_STD_BMAP_BIT_MAX 0
> +#define KVM_REG_ARM_STD_HYP_BMAP_BIT_MAX 0
>
> #define KVM_ARM_SMCCC_STD_FEATURES GENMASK(KVM_REG_ARM_STD_BMAP_BIT_MAX, 0)
> +#define KVM_ARM_SMCCC_STD_HYP_FEATURES GENMASK(KVM_REG_ARM_STD_HYP_BMAP_BIT_MAX, 0)
>
> int kvm_hvc_call_handler(struct kvm_vcpu *vcpu);
>
>
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