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 A2CE8C43602 for ; Mon, 6 Jul 2026 06:05:10 +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=r/6QCDeil0i4wpPLRy/lh5myzwbTMSRGajg6rLXjcnQ=; b=HhFqwtnKDCguWxV0n3zDyBizpS HjaagtIg8xV7Oz2Oy//VM6n5r3UlfAUsDN6WgukcOtz0jq+jCLX2YajqqhczkcuD+7FzZijwARKYL WjIGiNv9wJrL9h5pkBw0sSC61Ffn+fiyFnqgvMn5aK8T8j7y5UCYyTwH/22m2YNsyZ4ENlbcVLeqX bbg/INz/RtXZx3VjTtku9UwSUUPPHNoak+skkQC5pGhLIS9/BH/k/DEomUCYeM8VfLuvLkmQOBM6N eXuv6fVO6VVQFinpxEoDAz7Jhxf5W4l3MiVby19I8J5s6z8HNl2jngq7MbpcAbX2h/kosG21iS6ax 5bOSwPqA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wgcRz-0000000BZ82-32KB; Mon, 06 Jul 2026 06:05:03 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wgcRy-0000000BZ7L-2JSs for linux-arm-kernel@lists.infradead.org; Mon, 06 Jul 2026 06:05:02 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 0436D600BB; Mon, 6 Jul 2026 06:05:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 96A2A1F000E9; Mon, 6 Jul 2026 06:04:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783317901; bh=r/6QCDeil0i4wpPLRy/lh5myzwbTMSRGajg6rLXjcnQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=AeQvRqngK209IZbTEJdvoEFXWzsasnIiz0BF4GHk03AcWpk81M2iDCjTl4avLbvD7 hAvYX22sB47e9A54rbl/U86iI6fuKU7lb6JnqE2f597IJ3VLp+bsp3eavf2VXQ0Iwh 8Bfaa+V1OEbvGg8y8TCPVnEA5t4n9LHIY5bFOX71vwTF74RLqlD/C2Gj5+pTZinGSQ lgC2CALzEgO+JfsSFHHh7uWFiuk2jd16MZAPXlPa1ch/4hkq7bxNX+9dP2wLz45//P aWQkggnoQKBqp1BVKpXaqviWku5PXU9EL9Vcr+wJcCCHlXecKym1SpLjJ0tJMkU2wA RiFBu6r3vhuWQ== From: "Aneesh Kumar K.V (Arm)" To: linux-coco@lists.linux.dev, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev Cc: "Aneesh Kumar K.V (Arm)" , Catalin Marinas , Jason Gunthorpe , Marc Zyngier , Marek Szyprowski , Robin Murphy , Steven Price , Suzuki K Poulose , Thomas Gleixner , Will Deacon Subject: [PATCH v5 02/10] irqchip/gic-v3-its: Align shared ITS allocations to the CoCo shared granule size Date: Mon, 6 Jul 2026 11:34:24 +0530 Message-ID: <20260706060432.1375570-3-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260706060432.1375570-1-aneesh.kumar@kernel.org> References: <20260706060432.1375570-1-aneesh.kumar@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 ITS tables allocated by the coco guest are shared with the hypervisor. These allocations must satisfy the host shared-buffer granule size so that the full converted range is safe for host access. Allocate ITS pages using a size rounded up to the shared granule size and use the same allocation order when encrypting, decrypting and freeing the memory. Also grow the ITT cache in shared-granule sized chunks instead of assuming PAGE_SIZE is sufficient. Signed-off-by: Aneesh Kumar K.V (Arm) --- drivers/irqchip/irq-gic-v3-its.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index b57d81ad33a0..5d6d38aa0dae 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -213,16 +213,17 @@ static gfp_t gfp_flags_quirk; static struct page *its_alloc_pages_node(int node, gfp_t gfp, unsigned int order) { + unsigned int alloc_order; struct page *page; int ret = 0; - page = alloc_pages_node(node, gfp | gfp_flags_quirk, order); - + alloc_order = get_order(mem_cc_align_to_shared_granule(PAGE_SIZE << order)); + page = alloc_pages_node(node, gfp | gfp_flags_quirk, alloc_order); if (!page) return NULL; ret = set_memory_decrypted((unsigned long)page_address(page), - 1 << order); + 1 << alloc_order); /* * If set_memory_decrypted() fails then we don't know what state the * page is in, so we can't free it. Instead we leak it. @@ -241,13 +242,16 @@ static struct page *its_alloc_pages(gfp_t gfp, unsigned int order) static void its_free_pages(void *addr, unsigned int order) { + int alloc_order; + + alloc_order = get_order(mem_cc_align_to_shared_granule(PAGE_SIZE << order)); /* * If the memory cannot be encrypted again then we must leak the pages. * set_memory_encrypted() will already have WARNed. */ - if (set_memory_encrypted((unsigned long)addr, 1 << order)) + if (set_memory_encrypted((unsigned long)addr, 1 << alloc_order)) return; - free_pages((unsigned long)addr, order); + free_pages((unsigned long)addr, alloc_order); } static struct gen_pool *itt_pool; @@ -272,7 +276,8 @@ static void *itt_alloc_pool(int node, int size) if (!page) break; - gen_pool_add(itt_pool, (unsigned long)page_address(page), PAGE_SIZE, node); + gen_pool_add(itt_pool, (unsigned long)page_address(page), + mem_cc_align_to_shared_granule(PAGE_SIZE), node); } while (!addr); return (void *)addr; -- 2.43.0