linux-kernel - Re: [PATCH RFC v2 3/3] riscv: KVM: Add Svukte extension support for Guest/VM

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAAhSdy0ncLTAjEE1s-GWL95sscxwQFsKn1rXyA1_VVfk1bQBiw@mail.gmail.com>
Date: Fri, 25 Oct 2024 00:46:51 +0530
From: Anup Patel <anup@...infault.org>
To: Max Hsu <max.hsu@...ive.com>
Cc: Conor Dooley <conor@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
	Atish Patra <atishp@...shpatra.org>, Palmer Dabbelt <palmer@...ive.com>, 
	linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, 
	kvm-riscv@...ts.infradead.org, Samuel Holland <samuel.holland@...ive.com>
Subject: Re: [PATCH RFC v2 3/3] riscv: KVM: Add Svukte extension support for Guest/VM

On Fri, Sep 27, 2024 at 7:12 PM Max Hsu <max.hsu@...ive.com> wrote:
>
> Add KVM ISA extension ONE_REG interface to allow VMM tools to
> detect and enable Svukte extension for Guest/VM.
>
> Reviewed-by: Samuel Holland <samuel.holland@...ive.com>
> Signed-off-by: Max Hsu <max.hsu@...ive.com>
> ---
>  arch/riscv/include/uapi/asm/kvm.h | 1 +
>  arch/riscv/kvm/vcpu_onereg.c      | 1 +
>  2 files changed, 2 insertions(+)
>
> diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
> index e97db3296456e19f79ca02e4c4f70ae1b4abb48b..41b466b7ffaec421e8389d3f5b178580091a2c98 100644
> --- a/arch/riscv/include/uapi/asm/kvm.h
> +++ b/arch/riscv/include/uapi/asm/kvm.h
> @@ -175,6 +175,7 @@ enum KVM_RISCV_ISA_EXT_ID {
>         KVM_RISCV_ISA_EXT_ZCF,
>         KVM_RISCV_ISA_EXT_ZCMOP,
>         KVM_RISCV_ISA_EXT_ZAWRS,
> +       KVM_RISCV_ISA_EXT_SVUKTE,
>         KVM_RISCV_ISA_EXT_MAX,
>  };
>
> diff --git a/arch/riscv/kvm/vcpu_onereg.c b/arch/riscv/kvm/vcpu_onereg.c
> index b319c4c13c54ce22d2a7552f4c9f256a0c50780e..67237d6e53882a9fcd2cf265aa1704f25cc4a701 100644
> --- a/arch/riscv/kvm/vcpu_onereg.c
> +++ b/arch/riscv/kvm/vcpu_onereg.c
> @@ -41,6 +41,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
>         KVM_ISA_EXT_ARR(SVINVAL),
>         KVM_ISA_EXT_ARR(SVNAPOT),
>         KVM_ISA_EXT_ARR(SVPBMT),
> +       KVM_ISA_EXT_ARR(SVUKTE),
>         KVM_ISA_EXT_ARR(ZACAS),
>         KVM_ISA_EXT_ARR(ZAWRS),
>         KVM_ISA_EXT_ARR(ZBA),

The KVM_RISCV_ISA_EXT_SVUKTE should be added to the
switch-case in kvm_riscv_vcpu_isa_disable_allowed() because
hypervisor seems to have no way to disable Svukte for the Guest
when it's available on the Host.

Regards,
Anup