Message ID | 20230419221716.3603068-17-atishp@rivosinc.com (mailing list archive) |
---|---|
State | New |
Headers | show
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Wed, 19 Apr 2023 15:18:04 -0700 (PDT) Received: from atishp.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id jn11-20020a170903050b00b00196807b5189sm11619190plb.292.2023.04.19.15.18.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Apr 2023 15:18:04 -0700 (PDT) From: Atish Patra <atishp@rivosinc.com> To: linux-kernel@vger.kernel.org Cc: Atish Patra <atishp@rivosinc.com>, Alexandre Ghiti <alex@ghiti.fr>, Andrew Jones <ajones@ventanamicro.com>, Andrew Morton <akpm@linux-foundation.org>, Anup Patel <anup@brainfault.org>, Atish Patra <atishp@atishpatra.org>, =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= <bjorn@rivosinc.com>, Suzuki K Poulose <suzuki.poulose@arm.com>, Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>, Sean Christopherson <seanjc@google.com>, linux-coco@lists.linux.dev, Dylan Reid <dylan@rivosinc.com>, abrestic@rivosinc.com, Samuel Ortiz <sameo@rivosinc.com>, Christoph Hellwig <hch@infradead.org>, Conor Dooley <conor.dooley@microchip.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Guo Ren <guoren@kernel.org>, Heiko Stuebner <heiko@sntech.de>, Jiri Slaby <jirislaby@kernel.org>, kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, Mayuresh Chitale <mchitale@ventanamicro.com>, Palmer Dabbelt <palmer@dabbelt.com>, Paolo Bonzini <pbonzini@redhat.com>, Paul Walmsley <paul.walmsley@sifive.com>, Rajnesh Kanwal <rkanwal@rivosinc.com>, Uladzislau Rezki <urezki@gmail.com> Subject: [RFC 16/48] RISC-V: KVM: Skip most VCPU requests for TVMs Date: Wed, 19 Apr 2023 15:16:44 -0700 Message-Id: <20230419221716.3603068-17-atishp@rivosinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230419221716.3603068-1-atishp@rivosinc.com> References: <20230419221716.3603068-1-atishp@rivosinc.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: D442140014 X-Rspamd-Server: rspam09 X-Stat-Signature: cakh5a9sghyu9hmb68dtxpx18a83xkhc X-HE-Tag: 1681942685-135031 X-HE-Meta: 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 8y156rmU 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: <linux-mm.kvack.org> |
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RISC-V CoVE support
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expand
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diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index c53bf98..3b600c6 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -22,6 +22,7 @@ #include <asm/kvm_nacl.h> #include <asm/hwcap.h> #include <asm/sbi.h> +#include <asm/kvm_cove.h> const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = { KVM_GENERIC_VCPU_STATS(), @@ -1078,6 +1079,15 @@ static void kvm_riscv_check_vcpu_requests(struct kvm_vcpu *vcpu) if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu)) kvm_riscv_reset_vcpu(vcpu); + if (is_cove_vcpu(vcpu)) { + /* + * KVM doesn't need to do anything special here + * as the TSM is expected track the tlb version and issue + * hfence when vcpu is scheduled again. + */ + return; + } + if (kvm_check_request(KVM_REQ_UPDATE_HGATP, vcpu)) kvm_riscv_gstage_update_hgatp(vcpu);
Currently, KVM manages TLB shootdown, hgatp updates and fence.i through vcpu requests. TLB shootdown for the TVMs happens in co-ordination with TSM. The fence.i & hgatp updates are directly managed by the TSM. There is no need to issue these requests directly for TVMs. Signed-off-by: Atish Patra <atishp@rivosinc.com> --- arch/riscv/kvm/vcpu.c | 10 ++++++++++ 1 file changed, 10 insertions(+)