From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793810881; b=Ku4cTkAhSVe8RZCMDOjXHuiqQ7fNZnewwjHUV3Q4wMdbVv+bHrXfE/qNPyJb6BiZDxKk dpCnGVjTHBMNiCQFt9VKoecha54sdt4lolkUsrFPcx6kZtNiYhcfSLg5OKyR70i5/Nr+S 6+hdSdacYhMH6TD6aTvkJzDZDYeuK11K0tycp3HZuDS9uJKSDyN+7yIwDL4J3r+U+WsNu qnQ/tsN5rayfAdzLV/AFuOmwESJzh7zAt+weFgOQjN9aSLjxN7pb1sgIB0N1eI4b1oAzF t+nWp/BX6MUrg20Y2pvHjYv+Qy2QWDY7OUqfE8oKsbbj3zkeLYv7/fkttPc/O8+Twgw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793810881; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=FUPcWaonNrl3fb8O5Y7CNOmq4dU0FH4gssUQavbBAMM=; b=0zSbcH+UBB1YHvTPNOWcy6Ehs+B8V82HxT/EecMm+cgEmJF78K5ZBZgH0PylPdWI65mP aa2fcTIDEuMpC/bUa8e0ZEL7dOTZDjkaSTyjulSStRaafcuTfKQinERkQ5vlgl5nTZhsA pG0SewPJ4zwre4fPgZ8T+G5SDE4VNURpbiZc+441pbyx8SSX7JuXoNq5n7fPcSv9P/6I9 tcyQl4Rwcw+GrbTB8yGP01RVqENwIIqfPrcergJ5goOhSaxan1QDtEC0uAZsEEjDprbea JIHf6niwgmR7lSiM4YrRxRzlHDPR8ayOXFONKtAWQ5MoRMd5xsfaWTR2r1s6WSuxakQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=cPmahXQU; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E10DB606A33D; Wed, 4 Nov 2026 16:48:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=cPmahXQU Received: by smtp.kernel.org (Postfix) with ESMTPSA id AFF6D1F000C1; Wed, 4 Nov 2026 16:47:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793810880; bh=FUPcWaonNrl3fb8O5Y7CNOmq4dU0FH4gssUQavbBAMM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=cPmahXQUm2HT0fyQppUmsSG58zcC3W7kzJwjwC9+vjp2fpNugB1rRsrsK06XtbRE/ OHtCA1YhpJ0We7ep1aIheg+OsugQk9HRuy2duRGha0ESt19yeGKL6CA79Kg3kRrJvc t8ZPmq2S+PPZp7uAqs7vZjixGe9wIJm5NDjusaRJDB0kSeesNhMP+OnYqOR01ZoWGb yK/BlNnWnEK07l7oK5WJvskl6usQW4OOjLt0dFG/X2bUPzf6OJFGp5nsyDsGX+JrAm zbIZqkvz7hZDGsu8vU4VxVw2bS//9x4c3b3oL3FtSiEXt7ew5NL4KnybyjwL17/C9S r0avPyYj6CPmQ== From: "Aneesh Kumar K.V (Arm)" To: linux-coco@lists.linux.dev Cc: "Aneesh Kumar K.V (Arm)" , Andrew Morton , Baoquan He , Mike Rapoport , Pasha Tatashin , Pratyush Yadav , Catalin Marinas , =?UTF-8?q?Christian=20K=C3=B6nig?= , Jason Gunthorpe , Joerg Roedel , Marc Zyngier , Marek Szyprowski , Robin Murphy , Steven Price , Sumit Semwal , Suzuki K Poulose , Thomas Gleixner , Will Deacon , Russell King , Benjamin Gaignard , Brian Starkey , John Stultz , Mark Rutland , Radu Rendec , "T.J. Mercier" , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Ritesh Harjani , Shrikanth Hegde , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Kiryl Shutsemau , Rick Edgecombe , "K . Y . Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Paolo Bonzini , Vitaly Kuznetsov , Andy Lutomirski , Peter Zijlstra , dri-devel@lists.freedesktop.org, iommu@lists.linux.dev, linaro-mm-sig@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, linux-mm@kvack.org, kvmarm@lists.linux.dev, patches@lists.linux.dev Subject: [PATCH v9 04/14] irqchip/gic-v3-its: Allocate shared tables using CoCo shared memory allocator Date: Wed, 4 Nov 2026 22:15:45 +0530 Message-ID: <20261104164555.3555725-5-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261104164555.3555725-1-aneesh.kumar@kernel.org> References: <20261104164555.3555725-1-aneesh.kumar@kernel.org> X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit ITS command queues and tables are shared with the host in a confidential-computing guest. The ITS allocator currently assumes that the guest PAGE_SIZE is sufficient for both allocation alignment and private/shared state changes. Route ITS page allocations through alloc_cc_shared_pages_node(). Keep the tracked table size based on the ITS-requested order. On release, reconstruct the common allocation metadata from the original ITS order and the architecture granule size so the same transitioned range and buddy order are used. Cc: Marc Zyngier Cc: Thomas Gleixner Cc: Radu Rendec Signed-off-by: Aneesh Kumar K.V (Arm) --- drivers/irqchip/irq-gic-v3-its.c | 40 ++++++++++++-------------------- 1 file changed, 15 insertions(+), 25 deletions(-) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index a8860aaadf90..9ad66253ab16 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -19,7 +20,6 @@ #include #include #include -#include #include #include #include @@ -29,7 +29,6 @@ #include #include #include -#include #include #include #include @@ -216,28 +215,16 @@ static gfp_t gfp_flags_quirk; static struct page *its_alloc_pages_node(int node, gfp_t gfp, unsigned int order) { - struct page *page; - int ret = 0; + struct cc_shared_pages mem; if (node == NUMA_NO_NODE) node = numa_mem_id(); - page = alloc_pages_node(node, gfp | gfp_flags_quirk, order); - - if (!page) - return NULL; - - ret = set_memory_decrypted((unsigned long)page_address(page), - 1 << 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. - * set_memory_decrypted() will already have WARNed. - */ - if (ret) + if (alloc_cc_shared_pages_node(node, gfp | gfp_flags_quirk, + PAGE_SIZE << order, &mem)) return NULL; - return page; + return mem.page; } static struct page *its_alloc_pages(gfp_t gfp, unsigned int order) @@ -247,13 +234,15 @@ static struct page *its_alloc_pages(gfp_t gfp, unsigned int order) static void its_free_pages(void *addr, unsigned int 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)) + struct cc_shared_layout layout; + struct cc_shared_pages mem; + + if (WARN_ON(cc_shared_calc_layout(PAGE_SIZE << order, &layout))) return; - free_pages((unsigned long)addr, order); + + mem.page = virt_to_page(addr); + mem.shared_size = layout.shared_size; + free_cc_shared_pages(&mem); } static struct gen_pool *itt_pool; @@ -278,7 +267,8 @@ 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), + cc_shared_granule_size(), node); } while (!addr); return (void *)addr; -- 2.43.0