From patchwork Fri Dec 2 18:51:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oliver Upton X-Patchwork-Id: 13063129 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 4DE39C4332F for ; Fri, 2 Dec 2022 18:53:46 +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=wsh4FSVeL9gy11UqMO5sSbzxH4E75hg4stDiIqu/I+s=; b=c0mZ2zJ85ZpmX3 gzwMAyaz3JWIJeS3mf1eiRFtSgn3ZwUq80+Xy0EPgwLgxrQ+VTwAI2/i0obs8BO0Q1sK2bXeZGnfB H+zx8ZwAYbfFpEt7bcxDFjYA3R2nga1HxDB99n3PstO4jFS5+kJ3E8y+1tJk9im5fyGe9YOFeukSI W4/6GUVaAtFpBajgGilIHhJTlHCCfPXU6om3odcH4dZ7W/PCbV3M/OvIYVpzzxNmw2ET5NKnFg56L 00Oq0SAT4JrisLbnr/OT4xvvqQ8q5LDxcbhWYRvc+ZGtT8UeuMOgaQJNorZiOrrNvt1CU0Q+HEQ75 BduHnFPxfQrpxXnvsrvw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1p1B9V-000lzK-To; Fri, 02 Dec 2022 18:52:50 +0000 Received: from out-160.mta0.migadu.com ([2001:41d0:1004:224b::a0]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1p1B9A-000lnN-0l for linux-arm-kernel@lists.infradead.org; Fri, 02 Dec 2022 18:52:29 +0000 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1670007140; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=p0G2k7kswoLiP2SpEr1E5NK57Rotg3EVnFBgR0I4F3I=; b=eCd/6YTIdgNLrnwSwiWJGcww3hgEmBKfKAvGafrp8UOmQ8M7RWmBMHLU7/9MoNFNay6G8S yVt6FFkHbzpvEXwXFLXVaUFyS2MFoJgmVsptp5ChP1IWoXkjs0rfzAUfwQcr+ReyjY+0v2 sdb951ZVTYiLT9uRYhjOv9fbV9xgyvo= From: Oliver Upton To: Marc Zyngier , James Morse , Alexandru Elisei , Suzuki K Poulose , Oliver Upton , Catalin Marinas , Will Deacon Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, kvmarm@lists.linux.dev, Ricardo Koller , linux-kernel@vger.kernel.org Subject: [PATCH v2 3/6] KVM: arm64: Return EAGAIN for invalid PTE in attr walker Date: Fri, 2 Dec 2022 18:51:53 +0000 Message-Id: <20221202185156.696189-4-oliver.upton@linux.dev> In-Reply-To: <20221202185156.696189-1-oliver.upton@linux.dev> References: <20221202185156.696189-1-oliver.upton@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221202_105228_232505_A0C21CF6 X-CRM114-Status: GOOD ( 10.22 ) 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 Return EAGAIN for invalid PTEs in the attr walker, signaling to the caller that any serialization and/or invalidation can be elided. Signed-off-by: Oliver Upton --- arch/arm64/kvm/hyp/pgtable.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c index 98818214a479..204e59e05674 100644 --- a/arch/arm64/kvm/hyp/pgtable.c +++ b/arch/arm64/kvm/hyp/pgtable.c @@ -1048,7 +1048,7 @@ static int stage2_attr_walker(const struct kvm_pgtable_visit_ctx *ctx, struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops; if (!kvm_pte_valid(ctx->old)) - return 0; + return -EAGAIN; data->level = ctx->level; data->pte = pte;