From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 92FAD606A32E for ; Mon, 2 Nov 2026 13:04:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=cI1MFlVq; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=w1WrA+QX 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: Content-Type: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-Unsubscribe-Post: List-Owner; bh=huQ0ijUwRXsaVECpM6U2QYII1iXOy65EuxhrHwpGo7U=; b=cI1MFlVqsVhnNY KnoU5JuNIrC+tPmLFcOD9xEtHDjw090y9hJttltl+/cm+plh/4fDF4PMPwiceVufq3V9GE5jUm9oC G54s9Q2Tjg6XTDXkdOsM6vhaCep8spnVmHl2wC7uLmpqR7/pbizceaxVFOH7W7c81L05MSZB64Jgo l/nSkY/wrfpYXqLWpdlVfix5iZC0+yhl8z6LWGwthPYwfHrqqdPIwMTFfHWS3jtlqTaD5084WBde1 Zqbbw7PU75bRd+NyE5wGLVJMTZ1uZIR37quOlpbJ3YGgszvOI0TVwnj6g60qRopTty6uzgo8n/Wyi dWHpnQd306CNiSLq1www==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xNrfn-0000000GXn4-07Eq; Mon, 02 Nov 2026 13:02:03 +0000 Received: from out-194.mta1.migadu.com ([95.215.58.194] helo=mta1.migadu.com) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xNrfj-0000000GXkB-3imp for linux-arm-kernel@lists.infradead.org; Mon, 02 Nov 2026 13:02:01 +0000 X-Envelope-To: linux-arm-kernel@lists.infradead.org DKIM-Signature: a=rsa-sha256; bh=UYSZWfHATTfeaAzNdQKHeR6V+/Yl8CVJBkSsVEPXnhs=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1793624517; v=1; x=1794229317; b=w1WrA+QXLi8ERIeOHNlSSW08IDnMTvbodcd01jDJYbndDE8XcnceRkgwaZajVkfebLD99U5c KMXFUK93hcUtJIMwkKzuQK5HQtHivoc2Yi/TxIq/nWxxli5mHHPPm7X1ipChArN48ktqLmRGbNC aeuWQAfFF0xBQYWg9W/ta51M= X-Envelope-To: linux-arm-kernel@lists.infradead.org Received: by smtp.migadu.com with ESMTPS id c86092ad60db5f7c; Mon, 02 Nov 2026 13:01:57 +0000 X-Mizu-Trace-ID: c86092ad60db5f7c X-Migadu-Flow: FLOW_OUT From: Fuad Tabba To: Marc Zyngier , Oliver Upton Cc: Will Deacon , Catalin Marinas , Joey Gouly , Mark Rutland , Suzuki K Poulose , Raghavendra Rao Ananta , Sascha Bischoff , Thomas Gleixner , Sebastian Ene , =?UTF-8?q?Bart=C5=82omiej=20Grzesik?= , Mostafa Saleh , Vincent Donnefort , Vladimir Murzin , Zenghui Yu , Zenghui Yu , Steffen Eiden , Radu Rendec , Fuad Tabba , kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 04/13] irqchip/gic-v3-its: Page-align ITT allocations under protected KVM Date: Mon, 2 Nov 2026 13:01:24 +0000 Message-ID: <20261102130133.3684226-5-fuad.tabba@linux.dev> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20261102130133.3684226-1-fuad.tabba@linux.dev> References: <20261102130133.3684226-1-fuad.tabba@linux.dev> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261102_050200_073952_8857C4AB X-CRM114-Status: GOOD ( 11.96 ) X-Spam-Score: -2.8 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 From: Bartłomiej Grzesik A later patch has the protected KVM hypervisor take each device's ITT for as long as the device is mapped, by having the host donate its pages. A page the hypervisor already owns can't be donated again, so the MAPD of a device whose ITT shares a page with another device's would be rejected. Round each ITT up to whole pages in protected mode. This spends up to a page per MSI device where a 256-byte ITT would have shared one: tens of pages on a phone, thousands on a server with thousands of VFs. Signed-off-by: Bartłomiej Grzesik Signed-off-by: Fuad Tabba --- drivers/irqchip/irq-gic-v3-its.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 282e4bafb084f..8cc1bd8e7835b 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -3493,6 +3493,9 @@ static struct its_device *its_create_device(struct its_node *its, u32 dev_id, nr_ites = max(2, nvecs); sz = nr_ites * (FIELD_GET(GITS_TYPER_ITT_ENTRY_SIZE, its->typer) + 1); sz = max(sz, ITS_ITT_ALIGN); + /* The hypervisor takes ITT pages per device. */ + if (gic_is_protected_kvm()) + sz = PAGE_ALIGN(sz); itt = itt_alloc_pool(its->numa_node, sz); -- 2.47.3