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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, linaro-mm-sig@lists.linaro.org, linux-media@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v8 04/14] irqchip/gic-v3-its: Allocate shared tables using CoCo shared memory allocator Date: Thu, 24 Sep 2026 15:35:19 +0530 Message-ID: <20260924100529.1398790-5-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260924100529.1398790-1-aneesh.kumar@kernel.org> References: <20260924100529.1398790-1-aneesh.kumar@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam06 X-Stat-Signature: m5kdtgh4ayqas1adaj4mx69ime3pj8gy X-Rspam-User: X-Rspamd-Queue-Id: 74298C0003 X-HE-Tag: 1790244418-681519 X-HE-Meta: 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 /bnuP1j6 XiO+PzyHqhqiDOnDuugH9Q08CKtrMD6rHo0KyWa/mmfh8enW4MRRHOK2GU9Gld2XBlvkKLYek/N+7nHjKA1XStCT7yKHuG5C68UiTa+kgU89sBf0lrjdKLSt5W7Hb5gt9L/zi51QvqGTJBGJfPzA+Y3CmIlU2hKjZ/tQXkrKamdG6UHke4Y8AcXULyYAWY6sVVuiRNcVUOKwr1aTIAjLB8XTmIOTKqnqPnjBRnrj+jmFOYZ1Sbb/D1gDj13hQAqRqpkFoF0WNaiYpaZ+gvRiuvpLFW3QyjjamTKGDts9w6D0IbKVhBm77d0n1m3RTTDAMCYt/J+nLCvQcyWQgAmfVN/k2fJeSY3Iq+wpwyQLeuH2TIXCSvvoVzCfzYddnwurK2cPHrrurm0zhsPPxgl9kPBFHNdwlEXFHcWut 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. 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 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