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Tue, 13 Oct 2026 09:58:13 -0700 (PDT) Date: Tue, 13 Oct 2026 11:58:12 -0500 From: Andy Chiu To: Samuel Holland Cc: Paul Walmsley , Anup Patel , Atish Patra , Palmer Dabbelt , linux-kernel@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org Subject: Re: [PATCH 3/3] RISC-V: KVM: Decouple vector prctl state from VM ISA Message-ID: References: <20261007085126.222688-1-samuel.holland@sifive.com> <20261007085126.222688-4-samuel.holland@sifive.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261007085126.222688-4-samuel.holland@sifive.com> On Wed, Oct 07, 2026 at 01:51:18AM -0700, Samuel Holland wrote: > The ability to prevent userspace from executing vector instructions was > provided as a escape hatch for software that was broken by adding vector > state to the signal context. This was hooked up to KVM so a process that > could not use V in userspace also could not create a KVM VM with V in > the ISA. > > Remove this connection as it does not really help with any compatibility > concerns. A VMM that does not understand V will not include it in the > virtual machine's ISA. > > Signed-off-by: Samuel Holland Reviewed-by: Andy Chiu > --- > > arch/riscv/kvm/isa.c | 3 --- > 1 file changed, 3 deletions(-) > > diff --git a/arch/riscv/kvm/isa.c b/arch/riscv/kvm/isa.c > index 971f44655100a..447c778bf850e 100644 > --- a/arch/riscv/kvm/isa.c > +++ b/arch/riscv/kvm/isa.c > @@ -9,7 +9,6 @@ > #include > #include > #include > -#include > > #define KVM_ISA_EXT_ARR(ext) \ > [KVM_RISCV_ISA_EXT_##ext] = RISCV_ISA_EXT_##ext > @@ -159,8 +158,6 @@ bool kvm_riscv_isa_enable_allowed(unsigned long ext) > * Guest OS can use Svadu only when host OS enable Svadu. > */ > return arch_has_hw_pte_young(); > - case KVM_RISCV_ISA_EXT_V: > - return riscv_v_vstate_ctrl_user_allowed(); > default: > break; > } > -- > 2.52.0 >