From nobody Thu Dec 18 15:48:20 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1A099C77B73 for ; Wed, 19 Apr 2023 22:20:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231478AbjDSWUp (ORCPT ); Wed, 19 Apr 2023 18:20:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42116 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232727AbjDSWUJ (ORCPT ); Wed, 19 Apr 2023 18:20:09 -0400 Received: from mail-pj1-x102c.google.com (mail-pj1-x102c.google.com [IPv6:2607:f8b0:4864:20::102c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3F085AD04 for ; Wed, 19 Apr 2023 15:18:57 -0700 (PDT) Received: by mail-pj1-x102c.google.com with SMTP id 98e67ed59e1d1-24736992dd3so182223a91.1 for ; Wed, 19 Apr 2023 15:18:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20221208.gappssmtp.com; s=20221208; t=1681942705; x=1684534705; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=UJcz91lEoSJqtalpSfBSHZNF30nj7YibjBRer+eosEg=; b=qMbw2bfkgktxDwIJo8enIEL5pLtnbolY3+JaaISTkIKsa3/Pbsco4zcJlI15aLKelR WFKrKF2Hz7v5krpEvYpYwDTqJPbGu3BuJcQtCe9xizDdAggE5jW1G4X8qqMenNOBqXz9 5gqd6GiYE1ZkgW2qNIjSboTRdUgFAKPx3ibrEbYtA8McCRZRHbdZdMvH67xn6xctz3io Yx4YAKRBSdhdHTVV7HAXUHddiREJjeIsjlNB/MFPQtt0zqpmQorHvJ8xpPjM9lkMYa3A PJWfAzX50ZJIGmvwtxGZ3PpJ/kZeMQBLQ0BYf7N4KMtYq6ZlC++uPwgnbCGRBd8idM/u /cyA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1681942705; x=1684534705; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=UJcz91lEoSJqtalpSfBSHZNF30nj7YibjBRer+eosEg=; b=XVTzrPucqQf80chHeNGV2Mv/c6SEu7AJQx1ietelyNeAmHHKO83qGu8P7N2gbHKC+J oG2QH1jKk3heIKCL2VFnVrFr9M6WIsz5fQ8j3lbdZIbQ1pfGS8zjgvT8GlnI5HdFK1Pj kgCwzIJ7tB+c5fp9kS4KUKNy+ui8oB8aNmC/G6yEwAuAp5SG/0zoBrBhian9+BqVZeHK OmI1uW6EsHMr+tBdNAIru30U2zVtxHP3nbIiqxM5IuWKju5cxiTEW0lTX1ehNO7DyBGq TXrF22GMvVix1Ez1Kix8DvoHuXs5cnomVa5Si1bpWWqQqeYG4onsoQ1bHY0ij5T+E6ju Ih0w== X-Gm-Message-State: AAQBX9eXeNdPgfGd4ZccBHKsndgJbYwDuOpplPc3c5Oq9ZM2zoOy+NdJ 6niBw246fmHZrSqDK1w8J/KOSRFLk0mLqCpSGf4= X-Google-Smtp-Source: AKy350Z8cKy3RK/3X5ej3IZFoGxmT2xiFm/BExphbF3ahTLRykDnPstTsJrfduCst6vY0llDQCAqqw== X-Received: by 2002:a17:90b:890:b0:23a:333c:6bab with SMTP id bj16-20020a17090b089000b0023a333c6babmr4018734pjb.23.1681942704931; Wed, 19 Apr 2023 15:18:24 -0700 (PDT) Received: from atishp.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id jn11-20020a170903050b00b00196807b5189sm11619190plb.292.2023.04.19.15.18.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Apr 2023 15:18:24 -0700 (PDT) From: Atish Patra To: linux-kernel@vger.kernel.org Cc: Atish Patra , Alexandre Ghiti , Andrew Jones , Andrew Morton , Anup Patel , Atish Patra , =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= , Suzuki K Poulose , Will Deacon , Marc Zyngier , Sean Christopherson , linux-coco@lists.linux.dev, Dylan Reid , abrestic@rivosinc.com, Samuel Ortiz , Christoph Hellwig , Conor Dooley , Greg Kroah-Hartman , Guo Ren , Heiko Stuebner , Jiri Slaby , kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, Mayuresh Chitale , Palmer Dabbelt , Paolo Bonzini , Paul Walmsley , Rajnesh Kanwal , Uladzislau Rezki Subject: [RFC 25/48] RISC-V: KVM: Skip HVIP update for TVMs Date: Wed, 19 Apr 2023 15:16:53 -0700 Message-Id: <20230419221716.3603068-26-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: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Skip HVIP update as the Host shouldn't be able to inject interrupt directly to a TVM. Signed-off-by: Atish Patra --- arch/riscv/kvm/vcpu.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index 43a0b8c..20d4800 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -822,7 +822,10 @@ void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *v= cpu) /* Read current HVIP and VSIE CSRs */ csr->vsie =3D nacl_csr_read(CSR_VSIE); =20 - /* Sync-up HVIP.VSSIP bit changes does by Guest */ + /* + * Sync-up HVIP.VSSIP bit changes does by Guest. For TVMs, + * the HVIP is not updated by the TSM. Expect it to be zero. + */ hvip =3D nacl_csr_read(CSR_HVIP); if ((csr->hvip ^ hvip) & (1UL << IRQ_VS_SOFT)) { if (hvip & (1UL << IRQ_VS_SOFT)) { @@ -1305,8 +1308,9 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) */ kvm_riscv_vcpu_flush_interrupts(vcpu); =20 - /* Update HVIP CSR for current CPU */ - kvm_riscv_update_hvip(vcpu); + /* Update HVIP CSR for current CPU only for non TVMs */ + if (!is_cove_vcpu(vcpu)) + kvm_riscv_update_hvip(vcpu); =20 if (ret <=3D 0 || kvm_riscv_gstage_vmid_ver_changed(vcpu->kvm) || --=20 2.25.1