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b=Kc8P2140ujn+VDpWuuA0syxxlPiR5Dl/sChZvXp0DKgAkTCax/cLTbAp8LB0IWXAB R4hVFA8/L+PQBfe/eKPRAHKK3vjVTVdKREnLY52b3114xvDk3GOmnJLuphnn5R+2sm uOTWUiy5I/4uo1Ehng06km71pPSO/H3d3vc7lO+Gx1bVyxhyybF3v6MrEd5Hy3uB/W f1R2+b/CTIVMQSZLAmFcf1ixeWZgNZEF7GsQ3UxDkz+aw0go90MnrLv0EykJ1GFlpI enwffS8MUCShd5hX7jN0XvuJEjTM/ibsrm8B2tGuAGjBx+1oFq7lO33iYzkp/Ypz4I NeRaMoJfvCMAw== 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)" , Andrew Morton , Catalin Marinas , christian.koenig@amd.com, Jason Gunthorpe , Joerg Roedel , Marc Zyngier , Marek Szyprowski , Robin Murphy , Steven Price , Sumit Semwal , Suzuki K Poulose , Thomas Gleixner , Will Deacon , dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-media@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v7 05/13] irqchip/gic-v3-its: Allocate shared tables using CoCo shared memory allocator Date: Mon, 21 Sep 2026 20:18:39 +0530 Message-ID: <20260921144847.501151-6-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260921144847.501151-1-aneesh.kumar@kernel.org> References: <20260921144847.501151-1-aneesh.kumar@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 7004740006 X-Stat-Signature: ypbaidw9qjy8awib979ork1zq96pgtsn X-Rspamd-Server: rspam01 X-HE-Tag: 1790002185-132738 X-HE-Meta: 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 fmjPyVPv yr0Rp/eaDz/bq1wDdUs4+wcFdZpiRQGWEe40KmbPncK3/dXEuNhCEqxAUAkJaI4wxarcukhvKvOJIgw3m2RzQTBXEny2L62EGCGAGEQYLcqc6fN2WmUEAiERIr5Fy6djv2tIUFpGsQXINQVAONoxyF4G6AUwV9T6qrzqY8s37sAlnRdj0dNLbbUncp0w1lX1OS681b3lcY5jHXsy4+A0ue+rqE7WzD6fXYECwZ94XXjPo49zV6zrRXpgjl5sRVD5D5EUoWY0kSVVFQ8XcOcRmE5xrUA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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. 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 ac5507acb1a0..4814161df02e 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 @@ -214,25 +213,13 @@ 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; - - page = alloc_pages_node(node, gfp | gfp_flags_quirk, order); - - if (!page) - return NULL; + struct cc_shared_pages mem; - 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) @@ -242,13 +229,15 @@ 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; @@ -273,7 +262,8 @@ 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