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Fri, 23 May 2025 06:05:55 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Fri, 23 May 2025 15:05:54 +0200 Message-Id: Subject: Re: [PATCH v8 13/14] RISC-V: KVM: add support for FWFT SBI extension Cc: "Samuel Holland" , "Andrew Jones" , "Deepak Gupta" , "Charlie Jenkins" , "Atish Patra" , "linux-riscv" To: =?utf-8?q?Cl=C3=A9ment_L=C3=A9ger?= , "Paul Walmsley" , "Palmer Dabbelt" , "Anup Patel" , "Atish Patra" , "Shuah Khan" , "Jonathan Corbet" , , , , , , From: =?utf-8?q?Radim_Kr=C4=8Dm=C3=A1=C5=99?= References: <20250523101932.1594077-1-cleger@rivosinc.com> <20250523101932.1594077-14-cleger@rivosinc.com> In-Reply-To: <20250523101932.1594077-14-cleger@rivosinc.com> 2025-05-23T12:19:30+02:00, Cl=C3=A9ment L=C3=A9ger : > +++ b/arch/riscv/kvm/vcpu_sbi_fwft.c > +static const enum sbi_fwft_feature_t kvm_fwft_defined_features[] =3D { > + SBI_FWFT_MISALIGNED_EXC_DELEG, > + SBI_FWFT_LANDING_PAD, > + SBI_FWFT_SHADOW_STACK, > + SBI_FWFT_DOUBLE_TRAP, > + SBI_FWFT_PTE_AD_HW_UPDATING, > + SBI_FWFT_POINTER_MASKING_PMLEN, > +}; How will userspace control which subset of these features is allowed in the guest? (We can reuse the KVM SBI extension interface if we don't want to add a FWFT specific ONE_REG.) Thanks.