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Message-ID: <20250322-c4eaee71aa9c1f0b13ca8fef@orel>
Date: Sat, 22 Mar 2025 13:30:10 +0100
From: Andrew Jones <ajones@...tanamicro.com>
To: Clément Léger <cleger@...osinc.com>
Cc: Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>, Anup Patel <anup@...infault.org>,
Atish Patra <atishp@...shpatra.org>, Shuah Khan <shuah@...nel.org>, Jonathan Corbet <corbet@....net>,
linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org, linux-kselftest@...r.kernel.org,
Samuel Holland <samuel.holland@...ive.com>
Subject: Re: [PATCH v4 17/18] RISC-V: KVM: add support for FWFT SBI extension
On Mon, Mar 17, 2025 at 06:06:23PM +0100, Clément Léger wrote:
> Add basic infrastructure to support the FWFT extension in KVM.
>
> Signed-off-by: Clément Léger <cleger@...osinc.com>
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> ---
> arch/riscv/include/asm/kvm_host.h | 4 +
> arch/riscv/include/asm/kvm_vcpu_sbi.h | 1 +
> arch/riscv/include/asm/kvm_vcpu_sbi_fwft.h | 29 +++
> arch/riscv/include/uapi/asm/kvm.h | 1 +
> arch/riscv/kvm/Makefile | 1 +
> arch/riscv/kvm/vcpu_sbi.c | 4 +
> arch/riscv/kvm/vcpu_sbi_fwft.c | 216 +++++++++++++++++++++
> 7 files changed, 256 insertions(+)
> create mode 100644 arch/riscv/include/asm/kvm_vcpu_sbi_fwft.h
> create mode 100644 arch/riscv/kvm/vcpu_sbi_fwft.c
>
> diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h
> index bb93d2995ea2..c0db61ba691a 100644
> --- a/arch/riscv/include/asm/kvm_host.h
> +++ b/arch/riscv/include/asm/kvm_host.h
> @@ -19,6 +19,7 @@
> #include <asm/kvm_vcpu_fp.h>
> #include <asm/kvm_vcpu_insn.h>
> #include <asm/kvm_vcpu_sbi.h>
> +#include <asm/kvm_vcpu_sbi_fwft.h>
> #include <asm/kvm_vcpu_timer.h>
> #include <asm/kvm_vcpu_pmu.h>
>
> @@ -281,6 +282,9 @@ struct kvm_vcpu_arch {
> /* Performance monitoring context */
> struct kvm_pmu pmu_context;
>
> + /* Firmware feature SBI extension context */
> + struct kvm_sbi_fwft fwft_context;
> +
> /* 'static' configurations which are set only once */
> struct kvm_vcpu_config cfg;
>
> diff --git a/arch/riscv/include/asm/kvm_vcpu_sbi.h b/arch/riscv/include/asm/kvm_vcpu_sbi.h
> index cb68b3a57c8f..ffd03fed0c06 100644
> --- a/arch/riscv/include/asm/kvm_vcpu_sbi.h
> +++ b/arch/riscv/include/asm/kvm_vcpu_sbi.h
> @@ -98,6 +98,7 @@ extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_hsm;
> extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_dbcn;
> extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_susp;
> extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_sta;
> +extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_fwft;
> extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental;
> extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor;
>
> diff --git a/arch/riscv/include/asm/kvm_vcpu_sbi_fwft.h b/arch/riscv/include/asm/kvm_vcpu_sbi_fwft.h
> new file mode 100644
> index 000000000000..9ba841355758
> --- /dev/null
> +++ b/arch/riscv/include/asm/kvm_vcpu_sbi_fwft.h
> @@ -0,0 +1,29 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (c) 2025 Rivos Inc.
> + *
> + * Authors:
> + * Clément Léger <cleger@...osinc.com>
> + */
> +
> +#ifndef __KVM_VCPU_RISCV_FWFT_H
> +#define __KVM_VCPU_RISCV_FWFT_H
> +
> +#include <asm/sbi.h>
> +
> +struct kvm_sbi_fwft_feature;
> +
> +struct kvm_sbi_fwft_config {
> + const struct kvm_sbi_fwft_feature *feature;
> + bool supported;
> + unsigned long flags;
> +};
> +
> +/* FWFT data structure per vcpu */
> +struct kvm_sbi_fwft {
> + struct kvm_sbi_fwft_config *configs;
> +};
> +
> +#define vcpu_to_fwft(vcpu) (&(vcpu)->arch.fwft_context)
> +
> +#endif /* !__KVM_VCPU_RISCV_FWFT_H */
> diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
> index f06bc5efcd79..fa6eee1caf41 100644
> --- a/arch/riscv/include/uapi/asm/kvm.h
> +++ b/arch/riscv/include/uapi/asm/kvm.h
> @@ -202,6 +202,7 @@ enum KVM_RISCV_SBI_EXT_ID {
> KVM_RISCV_SBI_EXT_DBCN,
> KVM_RISCV_SBI_EXT_STA,
> KVM_RISCV_SBI_EXT_SUSP,
> + KVM_RISCV_SBI_EXT_FWFT,
> KVM_RISCV_SBI_EXT_MAX,
> };
>
> diff --git a/arch/riscv/kvm/Makefile b/arch/riscv/kvm/Makefile
> index 4e0bba91d284..06e2d52a9b88 100644
> --- a/arch/riscv/kvm/Makefile
> +++ b/arch/riscv/kvm/Makefile
> @@ -26,6 +26,7 @@ kvm-y += vcpu_onereg.o
> kvm-$(CONFIG_RISCV_PMU_SBI) += vcpu_pmu.o
> kvm-y += vcpu_sbi.o
> kvm-y += vcpu_sbi_base.o
> +kvm-y += vcpu_sbi_fwft.o
> kvm-y += vcpu_sbi_hsm.o
> kvm-$(CONFIG_RISCV_PMU_SBI) += vcpu_sbi_pmu.o
> kvm-y += vcpu_sbi_replace.o
> diff --git a/arch/riscv/kvm/vcpu_sbi.c b/arch/riscv/kvm/vcpu_sbi.c
> index 50be079b5528..0748810c0252 100644
> --- a/arch/riscv/kvm/vcpu_sbi.c
> +++ b/arch/riscv/kvm/vcpu_sbi.c
> @@ -78,6 +78,10 @@ static const struct kvm_riscv_sbi_extension_entry sbi_ext[] = {
> .ext_idx = KVM_RISCV_SBI_EXT_STA,
> .ext_ptr = &vcpu_sbi_ext_sta,
> },
> + {
> + .ext_idx = KVM_RISCV_SBI_EXT_FWFT,
> + .ext_ptr = &vcpu_sbi_ext_fwft,
> + },
> {
> .ext_idx = KVM_RISCV_SBI_EXT_EXPERIMENTAL,
> .ext_ptr = &vcpu_sbi_ext_experimental,
> diff --git a/arch/riscv/kvm/vcpu_sbi_fwft.c b/arch/riscv/kvm/vcpu_sbi_fwft.c
> new file mode 100644
> index 000000000000..8a7cfe1fe7a7
> --- /dev/null
> +++ b/arch/riscv/kvm/vcpu_sbi_fwft.c
> @@ -0,0 +1,216 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2025 Rivos Inc.
> + *
> + * Authors:
> + * Clément Léger <cleger@...osinc.com>
> + */
> +
> +#include <linux/errno.h>
> +#include <linux/err.h>
> +#include <linux/kvm_host.h>
> +#include <asm/cpufeature.h>
> +#include <asm/sbi.h>
> +#include <asm/kvm_vcpu_sbi.h>
> +#include <asm/kvm_vcpu_sbi_fwft.h>
> +
> +struct kvm_sbi_fwft_feature {
> + /**
> + * @id: Feature ID
> + */
> + enum sbi_fwft_feature_t id;
> +
> + /**
> + * @supported: Check if the feature is supported on the vcpu
> + *
> + * This callback is optional, if not provided the feature is assumed to
> + * be supported
> + */
> + bool (*supported)(struct kvm_vcpu *vcpu);
> +
> + /**
> + * @set: Set the feature value
> + *
> + * Return SBI_SUCCESS on success or an SBI error (SBI_ERR_*)
> + *
> + * This callback is mandatory
> + */
> + long (*set)(struct kvm_vcpu *vcpu, struct kvm_sbi_fwft_config *conf, unsigned long value);
> +
> + /**
> + * @get: Get the feature current value
> + *
> + * Return SBI_SUCCESS on success or an SBI error (SBI_ERR_*)
> + *
> + * This callback is mandatory
> + */
> + long (*get)(struct kvm_vcpu *vcpu, struct kvm_sbi_fwft_config *conf, unsigned long *value);
^
extra space here
Thanks,
drew
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