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GET /api/patches/2225765/?format=api
{ "id": 2225765, "url": "http://patchwork.ozlabs.org/api/patches/2225765/?format=api", "web_url": "http://patchwork.ozlabs.org/project/kvm-riscv/patch/20260421145451.1597930-2-guoren@kernel.org/", "project": { "id": 70, "url": "http://patchwork.ozlabs.org/api/projects/70/?format=api", "name": "Linux KVM RISC-V", "link_name": "kvm-riscv", "list_id": "kvm-riscv.lists.infradead.org", "list_email": "kvm-riscv@lists.infradead.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "http://lists.infradead.org/pipermail/kvm-riscv/", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260421145451.1597930-2-guoren@kernel.org>", "list_archive_url": null, "date": "2026-04-21T14:54:48", "name": "[1/3] RISC-V: KVM: AIA: Make HGEI number and management fully per-CPU", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "4ce855ccf7674f374305fc223a4ebc3efc6f548c", "submitter": { "id": 75626, "url": "http://patchwork.ozlabs.org/api/people/75626/?format=api", "name": "Guo Ren", "email": "guoren@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/kvm-riscv/patch/20260421145451.1597930-2-guoren@kernel.org/mbox/", "series": [ { "id": 500831, "url": "http://patchwork.ozlabs.org/api/series/500831/?format=api", "web_url": "http://patchwork.ozlabs.org/project/kvm-riscv/list/?series=500831", "date": "2026-04-21T14:54:47", "name": "RISC-V: KVM: AIA: Convert HGEI management to fully per-HART", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500831/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2225765/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2225765/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=lists.infradead.org header.i=@lists.infradead.org\n header.a=rsa-sha256 header.s=bombadil.20210309 header.b=lR+H90oc;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=RTKaUxrB;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=none (no SPF record) smtp.mailfrom=lists.infradead.org\n (client-ip=2607:7c80:54:3::133; helo=bombadil.infradead.org;\n envelope-from=kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from bombadil.infradead.org (bombadil.infradead.org\n [IPv6:2607:7c80:54:3::133])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g0QQP6ZLgz1yCv\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 22 Apr 2026 00:55:41 +1000 (AEST)", "from localhost ([::1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux))\n\tid 1wFCVo-00000008n2w-1Zhv;\n\tTue, 21 Apr 2026 14:55:40 +0000", "from tor.source.kernel.org ([172.105.4.254])\n\tby bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux))\n\tid 1wFCVn-00000008n2l-07gs;\n\tTue, 21 Apr 2026 14:55:39 +0000", "from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58])\n\tby tor.source.kernel.org (Postfix) with ESMTP id 7905F6001A;\n\tTue, 21 Apr 2026 14:55:38 +0000 (UTC)", "by smtp.kernel.org (Postfix) with ESMTPSA id A00CDC2BCB7;\n\tTue, 21 Apr 2026 14:55:32 +0000 (UTC)" ], "DKIM-Signature": [ "v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;\n\td=lists.infradead.org; s=bombadil.20210309; h=Sender:\n\tContent-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post:\n\tList-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:\n\tMessage-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:\n\tResent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:\n\tList-Owner; bh=ZIXBpMVlBug+GeiMlQGRBhcKipeEyXsBqbyXQTybdsg=; b=lR+H90oczSR2Va\n\tHFtjKC4/htziuKiZcD4jCOLA6SBdus0pUCZwCPk+WSkKoQA0KXU8XTHOWdD99JMXMbdjjlbmlHWuQ\n\tzvCGwBcCJdaboDIFlUwqHqcFlyTJFiNV6EKk5pEU0ttip/VOqT10pVHI6f7n0BdCZjgNne/n3sTBP\n\tz6q4hG0n6cuTSQHHZZ6nB4txA53461O57BJWr4ggiEd2aldYt5RRsiKCXkxwqIKfdOG9so+0ux0F8\n\tneb9tTVcdRcWaztlGen/nKc/Y2aVVTnOj8N5gMziYdRGZ+SjVmXTRnmDP0Kz0+B9vRSkXRbe6vaic\n\ttp6gh+WNZBgvgArHshSQ==;", "v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1776783338;\n\tbh=yNgRE8sbFsnNOSNkaFVjWslqS4WljCPIev13eHJ7d2Y=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=RTKaUxrB6CCnvZO9DbKdwed0dvhzWBIhh60yKBBdZYUyGLOrHzPTFZA7VguG797+W\n\t kVkG6kerplCHTSg9AX1bJ2r91cZYFZzb2YEoem/3RRDl8AhkXZK3jb2w88mhKz+JZ+\n\t gcxQWAC2bM15un1YqKrH6ktP5Or/M4bAZc8FhwcLWqzcWWn/iJCC+1f45RNGNoxRdI\n\t N3eJR/humoI3w9Besak31t3dcQXLb+Fj7b/Kh7Q9VMZ3eR9G03rLKRM6NbsSoBkI8n\n\t Tgckp5xr4/ct4QeAcsTQsjsXF+jAkXG5sKawrPriiiEyd7etliMmg2LWM+5eEsEUuS\n\t olYFcyAOSDeQg==" ], "From": "guoren@kernel.org", "To": "fangyu.yu@linux.alibaba.com,\n\tcp0613@linux.alibaba.com,\n\tinochiama@gmail.com,\n\tme@ziyao.cc,\n\tgaohan@iscas.ac.cn,\n\tanup@brainfault.org,\n\tatish.patra@linux.dev,\n\tpjw@kernel.org,\n\tpalmer@dabbelt.com,\n\talex@ghiti.fr,\n\ttglx@kernel.org,\n\tAlbert Ou <aou@eecs.berkeley.edu>", "Cc": "kvm-riscv@lists.infradead.org,\n\tkvm@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\t\"Guo Ren (Alibaba DAMO Academy)\" <guoren@kernel.org>,\n\tlinux-riscv@lists.infradead.org", "Subject": "[PATCH 1/3] RISC-V: KVM: AIA: Make HGEI number and management fully\n per-CPU", "Date": "Tue, 21 Apr 2026 10:54:48 -0400", "Message-Id": "<20260421145451.1597930-2-guoren@kernel.org>", "X-Mailer": "git-send-email 2.40.1", "In-Reply-To": "<20260421145451.1597930-1-guoren@kernel.org>", "References": "<20260421145451.1597930-1-guoren@kernel.org>", "MIME-Version": "1.0", "X-BeenThere": "kvm-riscv@lists.infradead.org", "X-Mailman-Version": "2.1.34", "Precedence": "list", "List-Id": "<kvm-riscv.lists.infradead.org>", "List-Unsubscribe": "<http://lists.infradead.org/mailman/options/kvm-riscv>,\n <mailto:kvm-riscv-request@lists.infradead.org?subject=unsubscribe>", "List-Archive": "<http://lists.infradead.org/pipermail/kvm-riscv/>", "List-Post": "<mailto:kvm-riscv@lists.infradead.org>", "List-Help": "<mailto:kvm-riscv-request@lists.infradead.org?subject=help>", "List-Subscribe": "<http://lists.infradead.org/mailman/listinfo/kvm-riscv>,\n <mailto:kvm-riscv-request@lists.infradead.org?subject=subscribe>", "Content-Type": "text/plain; charset=\"us-ascii\"", "Content-Transfer-Encoding": "7bit", "Sender": "\"kvm-riscv\" <kvm-riscv-bounces@lists.infradead.org>", "Errors-To": "kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org" }, "content": "From: \"Guo Ren (Alibaba DAMO Academy)\" <guoren@kernel.org>\n\nPreviously the number of Hypervisor Guest External Interrupt (HGEI)\nlines was stored in a single global variable `kvm_riscv_aia_nr_hgei`\nand assumed to be the same for all HARTs. This assumption does not\nhold on heterogeneous RISC-V SoCs where different cores may expose\ndifferent HGEIE CSR widths.\n\nIntroduce `nr_hgei` field into the per-CPU `struct aia_hgei_control`\nand probe the actual supported HGEI count for the current HART in\n`kvm_riscv_aia_enable()` using the standard RISC-V CSR probe\ntechnique:\n\n csr_write(CSR_HGEIE, -1UL);\n nr = fls_long(csr_read(CSR_HGEIE));\n if (nr)\n nr--;\n\nAll HGEI allocation, free and disable paths (`kvm_riscv_aia_free_hgei()`,\n`kvm_riscv_aia_disable()`, etc.) now use the per-CPU value instead of\nthe global one.\n\nThe early global `kvm_riscv_aia_nr_hgei` is kept only for deciding\nwhether SGEI interrupt registration is needed; the real per-HART\ninitialization of lock and free_bitmap is moved to enable time.\n\nThis makes KVM AIA robust on big.LITTLE-style and multi-vendor\nasymmetric platforms.\n\nSigned-off-by: Guo Ren (Alibaba DAMO Academy) <guoren@kernel.org>\n---\n arch/riscv/kvm/aia.c | 40 ++++++++++++++++++++++++----------------\n 1 file changed, 24 insertions(+), 16 deletions(-)", "diff": "diff --git a/arch/riscv/kvm/aia.c b/arch/riscv/kvm/aia.c\nindex 5ec503288555..a23729052cfb 100644\n--- a/arch/riscv/kvm/aia.c\n+++ b/arch/riscv/kvm/aia.c\n@@ -23,6 +23,7 @@ struct aia_hgei_control {\n \traw_spinlock_t lock;\n \tunsigned long free_bitmap;\n \tstruct kvm_vcpu *owners[BITS_PER_LONG];\n+\tunsigned int nr_hgei;\n };\n static DEFINE_PER_CPU(struct aia_hgei_control, aia_hgei);\n static int hgei_parent_irq;\n@@ -452,7 +453,7 @@ void kvm_riscv_aia_free_hgei(int cpu, int hgei)\n \n \traw_spin_lock_irqsave(&hgctrl->lock, flags);\n \n-\tif (hgei > 0 && hgei <= kvm_riscv_aia_nr_hgei) {\n+\tif (hgei > 0 && hgei <= hgctrl->nr_hgei) {\n \t\tif (!(hgctrl->free_bitmap & BIT(hgei))) {\n \t\t\thgctrl->free_bitmap |= BIT(hgei);\n \t\t\thgctrl->owners[hgei] = NULL;\n@@ -486,21 +487,8 @@ static irqreturn_t hgei_interrupt(int irq, void *dev_id)\n \n static int aia_hgei_init(void)\n {\n-\tint cpu, rc;\n+\tint rc;\n \tstruct irq_domain *domain;\n-\tstruct aia_hgei_control *hgctrl;\n-\n-\t/* Initialize per-CPU guest external interrupt line management */\n-\tfor_each_possible_cpu(cpu) {\n-\t\thgctrl = per_cpu_ptr(&aia_hgei, cpu);\n-\t\traw_spin_lock_init(&hgctrl->lock);\n-\t\tif (kvm_riscv_aia_nr_hgei) {\n-\t\t\thgctrl->free_bitmap =\n-\t\t\t\tBIT(kvm_riscv_aia_nr_hgei + 1) - 1;\n-\t\t\thgctrl->free_bitmap &= ~BIT(0);\n-\t\t} else\n-\t\t\thgctrl->free_bitmap = 0;\n-\t}\n \n \t/* Skip SGEI interrupt setup for zero guest external interrupts */\n \tif (!kvm_riscv_aia_nr_hgei)\n@@ -545,9 +533,29 @@ static void aia_hgei_exit(void)\n \n void kvm_riscv_aia_enable(void)\n {\n+\tstruct aia_hgei_control *hgctrl;\n+\n \tif (!kvm_riscv_aia_available())\n \t\treturn;\n \n+\thgctrl = this_cpu_ptr(&aia_hgei);\n+\n+\t/* Figure-out number of bits in HGEIE */\n+\tcsr_write(CSR_HGEIE, -1UL);\n+\thgctrl->nr_hgei = fls_long(csr_read(CSR_HGEIE));\n+\tcsr_write(CSR_HGEIE, 0);\n+\tif (hgctrl->nr_hgei)\n+\t\thgctrl->nr_hgei--;\n+\n+\tif (hgctrl->nr_hgei) {\n+\t\thgctrl->free_bitmap = BIT(hgctrl->nr_hgei + 1) - 1;\n+\t\thgctrl->free_bitmap &= ~BIT(0);\n+\t} else {\n+\t\thgctrl->free_bitmap = 0;\n+\t}\n+\n+\traw_spin_lock_init(&hgctrl->lock);\n+\n \tcsr_write(CSR_HVICTL, aia_hvictl_value(false));\n \tcsr_write(CSR_HVIPRIO1, 0x0);\n \tcsr_write(CSR_HVIPRIO2, 0x0);\n@@ -588,7 +596,7 @@ void kvm_riscv_aia_disable(void)\n \n \traw_spin_lock_irqsave(&hgctrl->lock, flags);\n \n-\tfor (i = 0; i <= kvm_riscv_aia_nr_hgei; i++) {\n+\tfor (i = 0; i <= hgctrl->nr_hgei; i++) {\n \t\tvcpu = hgctrl->owners[i];\n \t\tif (!vcpu)\n \t\t\tcontinue;\n", "prefixes": [ "1/3" ] }