From patchwork Thu Oct 12 05:15:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anup Patel X-Patchwork-Id: 13418327 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 1B2C8CDB47E for ; Thu, 12 Oct 2023 05:15:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235371AbjJLFPz (ORCPT ); Thu, 12 Oct 2023 01:15:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33626 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235305AbjJLFPu (ORCPT ); Thu, 12 Oct 2023 01:15:50 -0400 Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5BE52E5 for ; Wed, 11 Oct 2023 22:15:33 -0700 (PDT) Received: by mail-pj1-x1035.google.com with SMTP id 98e67ed59e1d1-27d113508bfso451163a91.3 for ; Wed, 11 Oct 2023 22:15:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1697087732; x=1697692532; darn=vger.kernel.org; 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=UnnUYFylMM7osLHu6Gv9hbGwiUDTuyMbxo3uWzdsMQU=; b=dqE0nNGaOHUpekPXSfgZl7ELDKFozCRnkUzlU0U79v0qa1HjKV6VKTn94IdJwbs7Dx WBV/TEw69VackiL3io9W+O9SJwsvcYvVtefCIgaZoqRtZnERLNvu65TF/AgODJigZ47c 280MMqvMu3EwXueYABWHYwTTE0vrpmw64V4PpYZ1mNhJCDxHoF9732oki6ogsw79wnMI cKAWequtAgEVA1UaAM8ryMEpuhk5DmWBr0U2XsK9sObQRyqiLxJuS72bVkcVKKe2bbsK V5Tn47JSKahVP3WomCV1qh0HsGySjZ9K9NFL40HoxkmMuhTLhikGx3gjT/2t9ahU4scX jQJg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697087732; x=1697692532; 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=UnnUYFylMM7osLHu6Gv9hbGwiUDTuyMbxo3uWzdsMQU=; b=QlP8dylrMO4HMAZ+JjCmxnxd0De7EJ5QxJLBjck/eJSjJPcSbNoyyqh8KSieo66YnS 5EVVJiW9DYs6x/MgLl6AqzRBqi+N4sIA4y+OqjeW+Vy9tZQutRzwK3NUm33v02Vt3dVH VzqvS5a4Db0+16sXzMksV5HxRsjwK3ClsF9O/P8dBqThZ8ipjFLwdvcOxtfuOVBCSI63 qd5CWrQMqLBjgLycHaz3S/6S3Kt8G2AMy24M3lQ5031Z3qduACemfnBb87cRY0sdLBMR hEB3epV9oaabgeaHwETMS3CNMInPtwrn0N5iulkkN5oscyNZYJrxllMPbxG2raTBt/06 Wbhw== X-Gm-Message-State: AOJu0YwdvWz/598Lo++ie5JOVU0wytQPmCEONHYRPcGP6lerHE+RT2FE l7ENMsEdaAqSBJ2qxQQOGSyc6w== X-Google-Smtp-Source: AGHT+IFfVbiUmgMwoeGwA3ZIdiIUuzVdm9gRZ3aJR2yt7ibzGaKFZJms3sDVibgDvTppejsGgzuaOA== X-Received: by 2002:a17:90a:c254:b0:27d:1f9f:a57f with SMTP id d20-20020a17090ac25400b0027d1f9fa57fmr918230pjx.32.1697087732343; Wed, 11 Oct 2023 22:15:32 -0700 (PDT) Received: from anup-ubuntu-vm.localdomain ([106.51.83.242]) by smtp.gmail.com with ESMTPSA id s18-20020a17090330d200b001b9d95945afsm851309plc.155.2023.10.11.22.15.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Oct 2023 22:15:31 -0700 (PDT) From: Anup Patel To: Paolo Bonzini , Atish Patra , Palmer Dabbelt , Paul Walmsley , Greg Kroah-Hartman , Jiri Slaby Cc: Conor Dooley , Andrew Jones , kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-serial@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Anup Patel Subject: [PATCH v2 3/8] RISC-V: KVM: Allow some SBI extensions to be disabled by default Date: Thu, 12 Oct 2023 10:45:04 +0530 Message-Id: <20231012051509.738750-4-apatel@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231012051509.738750-1-apatel@ventanamicro.com> References: <20231012051509.738750-1-apatel@ventanamicro.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org 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 | 45 ++++++++++++++++----------- 3 files changed, 36 insertions(+), 19 deletions(-) diff --git a/arch/riscv/include/asm/kvm_vcpu_sbi.h b/arch/riscv/include/asm/kvm_vcpu_sbi.h index 8d6d4dce8a5e..c02bda5559d7 100644 --- a/arch/riscv/include/asm/kvm_vcpu_sbi.h +++ b/arch/riscv/include/asm/kvm_vcpu_sbi.h @@ -35,6 +35,9 @@ struct kvm_vcpu_sbi_return { struct kvm_vcpu_sbi_extension { unsigned long extid_start; unsigned long extid_end; + + bool default_unavail; + /** * SBI extension handler. It can be defined for a given extension or group of * extension. But it should always return linux error codes rather than SBI @@ -59,6 +62,7 @@ int kvm_riscv_vcpu_get_reg_sbi_ext(struct kvm_vcpu *vcpu, const struct kvm_vcpu_sbi_extension *kvm_vcpu_sbi_find_ext( struct kvm_vcpu *vcpu, unsigned long extid); int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, struct kvm_run *run); +void kvm_riscv_vcpu_sbi_init(struct kvm_vcpu *vcpu); #ifdef CONFIG_RISCV_SBI_V01 extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_v01; diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index c061a1c5fe98..e087c809073c 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -141,6 +141,12 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) if (rc) return rc; + /* + * Setup SBI extensions + * NOTE: This must be the last thing to be initialized. + */ + kvm_riscv_vcpu_sbi_init(vcpu); + /* Reset VCPU */ kvm_riscv_reset_vcpu(vcpu); diff --git a/arch/riscv/kvm/vcpu_sbi.c b/arch/riscv/kvm/vcpu_sbi.c index 9cd97091c723..1b1cee86efda 100644 --- a/arch/riscv/kvm/vcpu_sbi.c +++ b/arch/riscv/kvm/vcpu_sbi.c @@ -155,14 +155,8 @@ static int riscv_vcpu_set_sbi_ext_single(struct kvm_vcpu *vcpu, if (!sext) return -ENOENT; - /* - * We can't set the extension status to available here, since it may - * have a probe() function which needs to confirm availability first, - * but it may be too early to call that here. We can set the status to - * unavailable, though. - */ - if (!reg_val) - scontext->ext_status[sext->ext_idx] = + scontext->ext_status[sext->ext_idx] = (reg_val) ? + KVM_RISCV_SBI_EXT_AVAILABLE : KVM_RISCV_SBI_EXT_UNAVAILABLE; return 0; @@ -337,18 +331,8 @@ const struct kvm_vcpu_sbi_extension *kvm_vcpu_sbi_find_ext( scontext->ext_status[entry->ext_idx] == KVM_RISCV_SBI_EXT_AVAILABLE) return ext; - if (scontext->ext_status[entry->ext_idx] == - KVM_RISCV_SBI_EXT_UNAVAILABLE) - return NULL; - if (ext->probe && !ext->probe(vcpu)) { - scontext->ext_status[entry->ext_idx] = - KVM_RISCV_SBI_EXT_UNAVAILABLE; - return NULL; - } - scontext->ext_status[entry->ext_idx] = - KVM_RISCV_SBI_EXT_AVAILABLE; - return ext; + return NULL; } } @@ -419,3 +403,26 @@ int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, struct kvm_run *run) return ret; } + +void kvm_riscv_vcpu_sbi_init(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_sbi_context *scontext = &vcpu->arch.sbi_context; + const struct kvm_riscv_sbi_extension_entry *entry; + const struct kvm_vcpu_sbi_extension *ext; + int i; + + for (i = 0; i < ARRAY_SIZE(sbi_ext); i++) { + entry = &sbi_ext[i]; + ext = entry->ext_ptr; + + if (ext->probe && !ext->probe(vcpu)) { + scontext->ext_status[entry->ext_idx] = + KVM_RISCV_SBI_EXT_UNAVAILABLE; + continue; + } + + scontext->ext_status[entry->ext_idx] = ext->default_unavail ? + KVM_RISCV_SBI_EXT_UNAVAILABLE : + KVM_RISCV_SBI_EXT_AVAILABLE; + } +}