From mboxrd@z Thu Jan 1 00:00:00 1970 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 6B305109B489 for ; Tue, 31 Mar 2026 15:51:45 +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:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ZOjdyc5IinqfPbQlSEmWIhjniGA13VnU5aBxynVfrms=; b=JNOESBn5hl8v5QoP0DxwS5Pzqy ixxDEFT0T6Nh3ZA/TY+8QNMcdAf8SOG1ufBeCv3oUSqfZGTqW5lz7AhKGZ8WhMLo7cQmwP8s/+7AH hSXpRfoo+5yDcJ8c8B/nmlFNufG2LdI3wWjWKeVqw0adeVw7+eaCjCbCPTJrOdn5L3RmLmhukvr2n pN8hq7vLgLzhWe33Z3LZ7xaoH6V4f1Zz62pWEI6EB7U8lF8kQ/1Uh9pO5GrV6sSycxSPwHMspxlfp NBBkiPAzEHJnjytsmR0WY5jJFYXzMYbZrYbfE3gmDslsmKC7bqlz1fgwYVwpeYTyTBND70KrcUTGn jGDyNoJQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w7bNT-0000000DD3w-1uFZ; Tue, 31 Mar 2026 15:51:39 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1w7bNP-0000000DD2p-2MP1 for linux-arm-kernel@lists.infradead.org; Tue, 31 Mar 2026 15:51:36 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 49DC6416E6; Tue, 31 Mar 2026 15:51:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 71BDCC19424; Tue, 31 Mar 2026 15:51:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774972295; bh=Jnvgq2pegetUjGhytI/QZI4LtPSB8jg7KrJ5nmPTBf0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Vm7PaAYQuiVvieD+rjDmaDmoT4LLOScZiZKiUpSSOeMjjYn5ZPFQn+regAxdhMgex gd7v5781pr8h4/EM+LM+Im1fMAg3O4uCA0YNYMBeGDWXSlvGGmCoG3ODiOgJA1OO9N F+1+r1dt3WgBTP+8uiwb3gWr0yyKbRDC7M2zNTq5CdBF9Mmg/KLSLor4hE3LSAFBB9 EGErZmdKzuMVNML7vqu5NDki9VBfSd4H9YCrXyWNpNf70RzkRrAum4z5Z2sbJrwdOP MNMofIBji9KZ1Z/7Dtma4kNhwvD+wXrPdzwnb+BN9VHKC0km4C+Z22eG4vCNVFxgjQ ZTA9oSijZqpog== From: Will Deacon To: kvmarm@lists.linux.dev Cc: linux-arm-kernel@lists.infradead.org, Will Deacon , Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Quentin Perret , Fuad Tabba , Vincent Donnefort , Mostafa Saleh , Alexandru Elisei Subject: [PATCH 2/3] KVM: arm64: Allow get_pkvm_hyp_vm() to take a reference to a dying VM Date: Tue, 31 Mar 2026 16:50:54 +0100 Message-ID: <20260331155056.28220-3-will@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260331155056.28220-1-will@kernel.org> References: <20260331155056.28220-1-will@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260331_085135_619043_165E14E7 X-CRM114-Status: GOOD ( 10.12 ) 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 Now that completion of the teardown path requires a refcount of zero for the target VM, we can allow get_pkvm_hyp_vm() to take a reference on a dying VM, which is necessary to unshare pages with a non-protected VM during the teardown process itself. Note that vCPUs belonging to a dying VM cannot be loaded and pages can only be reclaimed from a protected VM (via __pkvm_reclaim_dying_guest_page()) if the target VM is in the dying state. Signed-off-by: Will Deacon --- arch/arm64/kvm/hyp/nvhe/pkvm.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/arch/arm64/kvm/hyp/nvhe/pkvm.c b/arch/arm64/kvm/hyp/nvhe/pkvm.c index 3fd3b930beeb..b955da0e50bc 100644 --- a/arch/arm64/kvm/hyp/nvhe/pkvm.c +++ b/arch/arm64/kvm/hyp/nvhe/pkvm.c @@ -309,14 +309,8 @@ struct pkvm_hyp_vm *get_pkvm_hyp_vm(pkvm_handle_t handle) hyp_spin_lock(&vm_table_lock); hyp_vm = get_vm_by_handle(handle); - if (!hyp_vm) - goto unlock; - - if (hyp_vm->kvm.arch.pkvm.is_dying) - hyp_vm = NULL; - else + if (hyp_vm) hyp_page_ref_inc(hyp_virt_to_page(hyp_vm)); -unlock: hyp_spin_unlock(&vm_table_lock); return hyp_vm; -- 2.53.0.1118.gaef5881109-goog