From patchwork Wed Apr 9 01:41:32 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Levitsky X-Patchwork-Id: 14043969 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 0E4EBC369A2 for ; Wed, 9 Apr 2025 01:45:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:Content-Type: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:In-Reply-To:References:List-Owner; bh=aQ15qGlUaptB7o2KXAcGTjz0KUPJ/e9c4/mMMMjkWT0=; b=WepsVVv+wmAva/8dP1OtRvc9Jc FtP+jQgRaxLW80xAWD9ozdBxLtcic6+W7V/dwUss01m5OPAatRnLo2WCdq5fYCmn88yu4Qq+ULI3l wWFpFuDvk1mqo1p/vfDQkngm0K5WgqjRL3R2dBxOA1QPCeWrMC7p4IoHEn3B5vKIkdEn8CYzWKh0q E6Y4bQSaadf1YYE7f9AtXKP5Y5NtU8onVz4b4qj7j5Kc1js9GjgVTL7tSvNnfbsAWi/u1BroDO+ph 2DWdt8ih9BHlPjXoI12WSvVLJEaKVUPGm1dSDjafdsYsUiVw1QWCpUNW8gyY2Q4H1lXJN/jNqtd+V 83PFTmBA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1u2KVF-00000005s34-2d5W; Wed, 09 Apr 2025 01:45:21 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1u2KTR-00000005rZ6-0ulM for linux-arm-kernel@lists.infradead.org; Wed, 09 Apr 2025 01:43:31 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1744163007; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=aQ15qGlUaptB7o2KXAcGTjz0KUPJ/e9c4/mMMMjkWT0=; b=QbR060xgVP+aYZjO1MyUo/iWWZzLuP+9zpnrATKzPzGoXWkLV+Q/pDDujvAbI7R8xgqkuk wBcz62eKtWat7jcdh48YnlxrAUt174vTS2/+PhAnXSrdCYzuQ5OhwErkgTJTObagluaJWv RdRyYCJfJJeNlKxcHX2U9CBcHpZiKsM= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-22-BxhD3ttkMn6I5gCM8qizgw-1; Tue, 08 Apr 2025 21:41:55 -0400 X-MC-Unique: BxhD3ttkMn6I5gCM8qizgw-1 X-Mimecast-MFC-AGG-ID: BxhD3ttkMn6I5gCM8qizgw_1744162908 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 67A651800259; Wed, 9 Apr 2025 01:41:45 +0000 (UTC) Received: from starship.lan (unknown [10.22.65.191]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 22646180175B; Wed, 9 Apr 2025 01:41:37 +0000 (UTC) From: Maxim Levitsky To: kvm@vger.kernel.org Cc: Alexander Potapenko , "H. Peter Anvin" , Suzuki K Poulose , kvm-riscv@lists.infradead.org, Oliver Upton , Dave Hansen , Jing Zhang , Waiman Long , x86@kernel.org, Kunkun Jiang , Boqun Feng , Anup Patel , Albert Ou , kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, Zenghui Yu , Borislav Petkov , Alexandre Ghiti , Keisuke Nishimura , Sebastian Ott , Paolo Bonzini , Atish Patra , Paul Walmsley , Randy Dunlap , Will Deacon , Palmer Dabbelt , linux-riscv@lists.infradead.org, Marc Zyngier , linux-arm-kernel@lists.infradead.org, Joey Gouly , Peter Zijlstra , Ingo Molnar , Andre Przywara , Thomas Gleixner , Sean Christopherson , Catalin Marinas , Maxim Levitsky , Bjorn Helgaas Subject: [PATCH v2 0/4] KVM: extract lock_all_vcpus/unlock_all_vcpus Date: Tue, 8 Apr 2025 21:41:32 -0400 Message-Id: <20250409014136.2816971-1-mlevitsk@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250408_184329_367696_CE6A6CF0 X-CRM114-Status: UNSURE ( 8.48 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Implement Paolo's suggestion of reusing sev_lock/unlock_vcpus_for_migration in arm and riscv code for the purpose of taking vcpu->mutex of all vcpus of a VM. Because sev_lock/unlock_vcpus_for_migration already have a workaround for lockdep max lock depth, this fixes the lockdep warnings on arm which were the inspiration for this refactoring. This patch series was only compile tested on all 3 architectures. V2: added trylock option to kvm_lock_all_vcpus to be better compatible with the orginal code. Best regards, Maxim Levitsky Maxim Levitsky (4): locking/mutex: implement mutex_trylock_nested KVM: x86: move sev_lock/unlock_vcpus_for_migration to kvm_main.c KVM: arm64: switch to using kvm_lock/unlock_all_vcpus RISC-V: KVM: switch to kvm_lock/unlock_all_vcpus arch/arm64/include/asm/kvm_host.h | 3 -- arch/arm64/kvm/arch_timer.c | 4 +- arch/arm64/kvm/arm.c | 43 ---------------- arch/arm64/kvm/vgic/vgic-init.c | 4 +- arch/arm64/kvm/vgic/vgic-its.c | 8 +-- arch/arm64/kvm/vgic/vgic-kvm-device.c | 12 ++--- arch/riscv/kvm/aia_device.c | 34 +------------ arch/x86/kvm/svm/sev.c | 65 ++---------------------- include/linux/kvm_host.h | 6 +++ include/linux/mutex.h | 8 +++ kernel/locking/mutex.c | 14 ++++-- virt/kvm/kvm_main.c | 71 +++++++++++++++++++++++++++ 12 files changed, 116 insertions(+), 156 deletions(-)