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Message-ID: <Yi+bVM742+9W4TYj@google.com>
Date: Mon, 14 Mar 2022 19:45:24 +0000
From: Oliver Upton <oupton@...gle.com>
To: Raghavendra Rao Ananta <rananta@...gle.com>
Cc: 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>,
Paolo Bonzini <pbonzini@...hat.com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>, Peter Shier <pshier@...gle.com>,
Ricardo Koller <ricarkol@...gle.com>,
Reiji Watanabe <reijiw@...gle.com>,
Jing Zhang <jingzhangos@...gle.com>,
linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v4 06/13] KVM: arm64: Add standard hypervisor firmware
register
On Thu, Feb 24, 2022 at 05:25:52PM +0000, 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.
>
> The register is also added to the kvm_arm_vm_scope_fw_regs[] list
> as it maintains its state per-VM.
>
> Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>
> ---
> arch/arm64/include/asm/kvm_host.h | 2 ++
> arch/arm64/include/uapi/asm/kvm.h | 4 ++++
> arch/arm64/kvm/guest.c | 1 +
> arch/arm64/kvm/hypercalls.c | 20 +++++++++++++++++++-
> include/kvm/arm_hypercalls.h | 3 +++
> 5 files changed, 29 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index 1909ced3208f..318148b69279 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_hvc_desc: KVM ARM64 hypercall descriptor
> *
> * @hvc_std_bmap: Bitmap of standard secure service calls
> + * @hvc_std_hyp_bmap: Bitmap of standard hypervisor service calls
> */
> struct kvm_hvc_desc {
> u64 hvc_std_bmap;
> + u64 hvc_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 2decc30d6b84..9a2caead7359 100644
> --- a/arch/arm64/include/uapi/asm/kvm.h
> +++ b/arch/arm64/include/uapi/asm/kvm.h
> @@ -295,6 +295,10 @@ struct kvm_arm_copy_mte_tags {
> #define KVM_REG_ARM_STD_BIT_TRNG_V1_0 BIT(0)
> #define KVM_REG_ARM_STD_BMAP_BIT_MAX 0 /* Last valid bit */
>
> +#define KVM_REG_ARM_STD_HYP_BMAP KVM_REG_ARM_FW_BMAP_REG(1)
> +#define KVM_REG_ARM_STD_HYP_BIT_PV_TIME BIT(0)
> +#define KVM_REG_ARM_STD_HYP_BMAP_BIT_MAX 0 /* Last valid bit */
> +
> /* SVE registers */
> #define KVM_REG_ARM64_SVE (0x15 << KVM_REG_ARM_COPROC_SHIFT)
>
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index d66e6c742bbe..c42426d6137e 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -66,6 +66,7 @@ static const u64 kvm_arm_vm_scope_fw_regs[] = {
> KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1,
> KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2,
> KVM_REG_ARM_STD_BMAP,
> + KVM_REG_ARM_STD_HYP_BMAP,
> };
>
> /**
> diff --git a/arch/arm64/kvm/hypercalls.c b/arch/arm64/kvm/hypercalls.c
> index 48c126c3da72..ebc0cc26cf2e 100644
> --- a/arch/arm64/kvm/hypercalls.c
> +++ b/arch/arm64/kvm/hypercalls.c
> @@ -75,6 +75,10 @@ static bool kvm_hvc_call_supported(struct kvm_vcpu *vcpu, u32 func_id)
> case ARM_SMCCC_TRNG_RND64:
> return kvm_arm_fw_reg_feat_enabled(hvc_desc->hvc_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(hvc_desc->hvc_std_hyp_bmap,
> + KVM_REG_ARM_STD_HYP_BIT_PV_TIME);
> default:
> /* By default, allow the services that aren't listed here */
> return true;
> @@ -83,6 +87,7 @@ static bool kvm_hvc_call_supported(struct kvm_vcpu *vcpu, u32 func_id)
>
> int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
> {
> + struct kvm_hvc_desc *hvc_desc = &vcpu->kvm->arch.hvc_desc;
> u32 func_id = smccc_get_function(vcpu);
> u64 val[4] = {SMCCC_RET_NOT_SUPPORTED};
> u32 feature;
> @@ -134,7 +139,10 @@ 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(
> + hvc_desc->hvc_std_hyp_bmap,
It is probably OK to keep this parameter on the line above (just stay
under 100 characters a line).
> + KVM_REG_ARM_STD_HYP_BIT_PV_TIME))
> + val[0] = SMCCC_RET_SUCCESS;
> break;
> }
> break;
> @@ -179,6 +187,7 @@ static const u64 kvm_arm_fw_reg_ids[] = {
> KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1,
> KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2,
> KVM_REG_ARM_STD_BMAP,
> + KVM_REG_ARM_STD_HYP_BMAP,
> };
>
> void kvm_arm_init_hypercalls(struct kvm *kvm)
> @@ -186,6 +195,7 @@ void kvm_arm_init_hypercalls(struct kvm *kvm)
> struct kvm_hvc_desc *hvc_desc = &kvm->arch.hvc_desc;
>
> hvc_desc->hvc_std_bmap = ARM_SMCCC_STD_FEATURES;
> + hvc_desc->hvc_std_hyp_bmap = ARM_SMCCC_STD_HYP_FEATURES;
> }
>
> int kvm_arm_get_fw_num_regs(struct kvm_vcpu *vcpu)
> @@ -272,6 +282,9 @@ 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(hvc_desc->hvc_std_bmap);
> break;
> + case KVM_REG_ARM_STD_HYP_BMAP:
> + val = READ_ONCE(hvc_desc->hvc_std_hyp_bmap);
> + break;
> default:
> return -ENOENT;
> }
> @@ -294,6 +307,10 @@ static int kvm_arm_set_fw_reg_bmap(struct kvm_vcpu *vcpu, u64 reg_id, u64 val)
> fw_reg_bmap = &hvc_desc->hvc_std_bmap;
> fw_reg_features = ARM_SMCCC_STD_FEATURES;
> break;
> + case KVM_REG_ARM_STD_HYP_BMAP:
> + fw_reg_bmap = &hvc_desc->hvc_std_hyp_bmap;
> + fw_reg_features = ARM_SMCCC_STD_HYP_FEATURES;
> + break;
> default:
> return -ENOENT;
> }
> @@ -398,6 +415,7 @@ 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 64d30b452809..a1cb6e839c74 100644
> --- a/include/kvm/arm_hypercalls.h
> +++ b/include/kvm/arm_hypercalls.h
> @@ -9,6 +9,9 @@
> #define ARM_SMCCC_STD_FEATURES \
> GENMASK_ULL(KVM_REG_ARM_STD_BMAP_BIT_MAX, 0)
>
> +#define ARM_SMCCC_STD_HYP_FEATURES \
> + GENMASK_ULL(KVM_REG_ARM_STD_HYP_BMAP_BIT_MAX, 0)
> +
> int kvm_hvc_call_handler(struct kvm_vcpu *vcpu);
>
> static inline u32 smccc_get_function(struct kvm_vcpu *vcpu)
> --
> 2.35.1.473.g83b2b277ed-goog
>
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