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[2001:1ae9:1c2:4c00:20f:c6b4:1e57:7965]) by smtp.gmail.com with ESMTPSA id j8-20020a50ed08000000b00533dad8a9c5sm980417eds.38.2023.10.20.01.13.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Oct 2023 01:13:42 -0700 (PDT) Date: Fri, 20 Oct 2023 10:13:41 +0200 From: Andrew Jones To: Anup Patel Subject: Re: [PATCH v3 3/9] RISC-V: KVM: Allow some SBI extensions to be disabled by default Message-ID: <20231020-622a7f510c98e8c82135e6fc@orel> References: <20231020072140.900967-1-apatel@ventanamicro.com> <20231020072140.900967-4-apatel@ventanamicro.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20231020072140.900967-4-apatel@ventanamicro.com> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-serial@vger.kernel.org, kvm@vger.kernel.org, Greg Kroah-Hartman , Atish Patra , linuxppc-dev@lists.ozlabs.org, Conor Dooley , linux-kernel@vger.kernel.org, Palmer Dabbelt , kvm-riscv@lists.infradead.org, Paul Walmsley , Paolo Bonzini , linux-riscv@lists.infradead.org, Jiri Slaby Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Fri, Oct 20, 2023 at 12:51:34PM +0530, Anup Patel wrote: > Currently, all SBI extensions are enabled by default which is > problematic for SBI extensions (such as DBCN) which are forwarded > to the KVM user-space because we might have an older KVM user-space > which is not aware/ready to handle newer SBI extensions. Ideally, > the SBI extensions forwarded to the KVM user-space must be > disabled by default. > > To address above, we allow certain SBI extensions to be disabled > by default so that KVM user-space must explicitly enable such > SBI extensions to receive forwarded calls from Guest VCPU. > > Signed-off-by: Anup Patel > --- > arch/riscv/include/asm/kvm_vcpu_sbi.h | 4 ++ > arch/riscv/kvm/vcpu.c | 6 +++ > arch/riscv/kvm/vcpu_sbi.c | 57 +++++++++++++-------------- > 3 files changed, 38 insertions(+), 29 deletions(-) > Reviewed-by: Andrew Jones