From patchwork Tue Dec 5 18:11:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Jones X-Patchwork-Id: 13480557 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CD3C7C4167B for ; Tue, 5 Dec 2023 18:11:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=krZl+LS4eCoWUNcbraYFD/G1iPrW7GtEI0po1SzWviM=; b=hvD/ZGL66zUxVC 81E6kOpRMP3yzLMnaG8TpMTqQ+SpPdgOJbvTiumrbZPpbJpvOL2bCVRbBMnasOSKzX2Did6Fe3mDy j/7CgA9/K2eIBMLkXGiB3hOU/kwsBtcT7qIBTqFJEMnq19iGjQLM9H6AdKv15YuGYT2GgQXGT32zv affzADv1qY5EJp9vNeQGbZ6EqU8HdNLbJ8FRF8TC/RwtQ6If6Oa1Iikfkl7T+a05esWTWpYTLiUwc ABAlbjyYnokd21/51MfxmPT5lSI0htyTzjsWClYwGADWjxGwKXkU0Q6W2Kqm38W7nX5uZ/ZKRv0+M 8sjK8Xw8BdX8uAbszf7w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rAZtS-0086rk-0m; Tue, 05 Dec 2023 18:11:38 +0000 Received: from mail-ej1-x629.google.com ([2a00:1450:4864:20::629]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1rAZtN-0086k1-0M for linux-riscv@lists.infradead.org; Tue, 05 Dec 2023 18:11:34 +0000 Received: by mail-ej1-x629.google.com with SMTP id a640c23a62f3a-a1c890f9b55so117204066b.1 for ; Tue, 05 Dec 2023 10:11:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1701799889; x=1702404689; darn=lists.infradead.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=REnOHt+K++3Makx2KQUnuu8zkmaBNWfW7UtKBhZyEjc=; b=iCwmtuIMpRtbizQhZ8cUjbKJNBzG+CDwEpvfhYeFYtMrcxz0P/JDcPVSWQcaoNsXmn RJHYw+hTXGE2sF64yaaBXCSTdbYLTdFqtpjQ2QuiIGjcrwoC/Sn00otm/hw4nZAGqjaj 7ffNXmaefPk7X/w+mEQ/XFidTqXasSpA6gFlhmTP8h7Bb8HKqK9iQ37f5UjaPZuxOQdh IUPRQBAFfImJ2msXdUvbgNGWZjJbLHqAVfI+E+q/xi1efHsbm1q5t1axVD9qZ5YpFge0 Y2zSvTUduhAMezAijXiiS8T3fMoe7KmxRiyTRxrDWiTVvReFP3OR1vdiXpgYUrVnyOR3 Dd3w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701799889; x=1702404689; 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=REnOHt+K++3Makx2KQUnuu8zkmaBNWfW7UtKBhZyEjc=; b=VauVP6Ei77Y4uRIGSxhxetwE60P3WYyPhaWN17j96WrdyqaIEBoGUaFT93O2z9P+9Y 8ICd/IAsdzTV3rPfeG/SwAmYRkIl2GUt6VgdnsGEl5FHKAez/jm6tPLi19w8iHPXuHnQ LP2IyobrTi6wjFeWoXlnlU+htqg3RsNc+akPC6lm1kXofhbCHlFCEc/KOQMa7uwuWXSB 7s4mw9tRIVFKAVQbuiEbm+DeHvfkOqy27tIt57DI0gTgW2Y3+4pEPYEXHnM6UOhugciU FkjvlUmGVDTpZWBvWFgpL9c5p10ctKwDjyfMLVmIAwObpsF7rGohMCcDFBy6MxmahLZ0 QM+g== X-Gm-Message-State: AOJu0YzcjQvG/OQFy9brxzTkDZ1N0luI54U4XI22ABDbdwEQFkK6ixYt f51LRVKc56f1NTvxNeyCvU1j2A== X-Google-Smtp-Source: AGHT+IGquDSixYJu18mH30sSOmuHmw/0Pl8F0wzzIkhrPp1ptns8txZD4CRCno7vFbtWaryTynxQdg== X-Received: by 2002:a17:906:3488:b0:a19:a1ba:da71 with SMTP id g8-20020a170906348800b00a19a1bada71mr4785159ejb.152.1701799889425; Tue, 05 Dec 2023 10:11:29 -0800 (PST) Received: from localhost (2001-1ae9-1c2-4c00-20f-c6b4-1e57-7965.ip6.tmcz.cz. [2001:1ae9:1c2:4c00:20f:c6b4:1e57:7965]) by smtp.gmail.com with ESMTPSA id wn3-20020a170907068300b00a1b7b0cc30dsm2671743ejb.7.2023.12.05.10.11.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Dec 2023 10:11:29 -0800 (PST) From: Andrew Jones To: kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, virtualization@lists.linux-foundation.org Cc: anup@brainfault.org, atishp@atishpatra.org, pbonzini@redhat.com, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, jgross@suse.com, srivatsa@csail.mit.edu, guoren@kernel.org Subject: [PATCH v1 06/14] RISC-V: KVM: Add steal-update vcpu request Date: Tue, 5 Dec 2023 19:11:26 +0100 Message-ID: <20231205181119.207204-22-ajones@ventanamicro.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231205181119.207204-16-ajones@ventanamicro.com> References: <20231205181119.207204-16-ajones@ventanamicro.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231205_101133_152254_D494DEF0 X-CRM114-Status: GOOD ( 12.62 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Add a new vcpu request to inform a vcpu that it should record its steal-time information. The request is made each time it has been detected that the vcpu task was not assigned a cpu for some time, which is easy to do by making the request from vcpu-load. The record function is just a stub for now and will be filled in with the rest of the steal-time support functions in following patches. Signed-off-by: Andrew Jones --- arch/riscv/include/asm/kvm_host.h | 3 +++ arch/riscv/kvm/vcpu.c | 5 +++++ arch/riscv/kvm/vcpu_sbi_sta.c | 4 ++++ 3 files changed, 12 insertions(+) diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h index 0eefd9c991ae..230b82c3118d 100644 --- a/arch/riscv/include/asm/kvm_host.h +++ b/arch/riscv/include/asm/kvm_host.h @@ -41,6 +41,7 @@ KVM_ARCH_REQ_FLAGS(4, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) #define KVM_REQ_HFENCE \ KVM_ARCH_REQ_FLAGS(5, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) +#define KVM_REQ_STEAL_UPDATE KVM_ARCH_REQ(6) enum kvm_riscv_hfence_type { KVM_RISCV_HFENCE_UNKNOWN = 0, @@ -372,4 +373,6 @@ bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, u64 mask); void kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu); void kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu); +void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu); + #endif /* __RISCV_KVM_HOST_H__ */ diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index e087c809073c..b77f585879b7 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -541,6 +541,8 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) kvm_riscv_vcpu_aia_load(vcpu, cpu); + kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); + vcpu->cpu = cpu; } @@ -614,6 +616,9 @@ static void kvm_riscv_check_vcpu_requests(struct kvm_vcpu *vcpu) if (kvm_check_request(KVM_REQ_HFENCE, vcpu)) kvm_riscv_hfence_process(vcpu); + + if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu)) + kvm_riscv_vcpu_record_steal_time(vcpu); } } diff --git a/arch/riscv/kvm/vcpu_sbi_sta.c b/arch/riscv/kvm/vcpu_sbi_sta.c index 839911dcd837..e28351c9488b 100644 --- a/arch/riscv/kvm/vcpu_sbi_sta.c +++ b/arch/riscv/kvm/vcpu_sbi_sta.c @@ -8,6 +8,10 @@ #include #include +void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu) +{ +} + static int kvm_sbi_sta_steal_time_set_shmem(struct kvm_vcpu *vcpu) { return SBI_ERR_FAILURE;