[{"id":3677083,"web_url":"http://patchwork.ozlabs.org/comment/3677083/","msgid":"<825cb787-b782-447d-90cf-d950d78e1cbb@linaro.org>","list_archive_url":null,"date":"2026-04-14T09:15:41","subject":"Re: [PATCH for-11.0 v3] accel/kvm: return early from\n kvm_irqchip_create if kvm does not support irqchip","submitter":{"id":85046,"url":"http://patchwork.ozlabs.org/api/people/85046/","name":"Philippe Mathieu-Daudé","email":"philmd@linaro.org"},"content":"On 14/4/26 06:59, Ani Sinha wrote:\n> During refactoring of kvm_irqchip_create(), the refactored code was returning\n> early from do_kvm_irqchip_create() function if the required essential\n> capabilities were not present in KVM. This was not translating to an early\n> return from kvm_irqchip_create() as was the case before refactoring.\n> This is because, do_kvm_irqchip_create() did not have a means to notify the\n> caller of the lack of required kvm capabilities. Fix this by making\n> do_notify_irqchip_create() return EOPNOTSUPP error when capabilities\n> are absent and then the caller can check the return code and return early.\n> \n> Due to this regression during refactoring, all KVM guests on ppc64le hang\n> immediately during startup and this completely breaks all functionality on\n> that platform.\n> \n> Fixes: 98884e0cc1 (\"accel/kvm: add changes required to support KVM VM file descriptor change\")\n> Message-ID: <20260413090010.60339-1-anisinha@redhat.com>\n> Reported-by: Misbah Anjum N \n> Reported-by: Gautam Menghani \n> Suggested-by: Fabiano Rosas \n> Suggested-by: Harsh Prateek Bora \n> Tested-by: Misbah Anjum N \n> Reviewed-by: Peter Maydell \n> Signed-off-by: Ani Sinha \n> ---\n> accel/kvm/kvm-all.c | 11 ++++++++---\n> 1 file changed, 8 insertions(+), 3 deletions(-)\n> \n> changelogs:\n> v2: refactoring included which will resubmitted again for 11.1\n> v3: basically v1 with tags added.\n> \n> diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c\n> index 774499d34f..92af42503b 100644\n> --- a/accel/kvm/kvm-all.c\n> +++ b/accel/kvm/kvm-all.c\n> @@ -2575,7 +2575,7 @@ void kvm_irqchip_set_qemuirq_gsi(KVMState *s, qemu_irq irq, int gsi)\n> g_hash_table_insert(s->gsimap, irq, GINT_TO_POINTER(gsi));\n> }\n> \n> -static void do_kvm_irqchip_create(KVMState *s)\n> +static int do_kvm_irqchip_create(KVMState *s)\n> {\n> int ret;\n> if (kvm_check_extension(s, KVM_CAP_IRQCHIP)) {\n> @@ -2587,7 +2587,7 @@ static void do_kvm_irqchip_create(KVMState *s)\n> exit(1);\n> }\n> } else {\n> - return;\n> + return -EOPNOTSUPP;\n> }\n> \n> if (kvm_check_extension(s, KVM_CAP_IRQFD) <= 0) {\n> @@ -2610,13 +2610,17 @@ static void do_kvm_irqchip_create(KVMState *s)\n> fprintf(stderr, \"Create kernel irqchip failed: %s\\n\", strerror(-ret));\n> exit(1);\n> }\n> +\n> + return 0;\n> }\n> \n> static void kvm_irqchip_create(KVMState *s)\n> {\n> assert(s->kernel_irqchip_split != ON_OFF_AUTO_AUTO);\n> \n> - do_kvm_irqchip_create(s);\n> + if (do_kvm_irqchip_create(s) < 0) {\n> + return;\n> + }\n> kvm_kernel_irqchip = true;\n> /* If we have an in-kernel IRQ chip then we must have asynchronous\n> * interrupt delivery (though the reverse is not necessarily true)\n> @@ -2835,6 +2839,7 @@ static int kvm_reset_vmfd(MachineState *ms)\n> }\n> \n> if (s->kernel_irqchip_allowed) {\n> + /* ignore return from this function */\n\nNo need to explain the code. If you want to add a comment, explain\nthe \"why\".\n\n> do_kvm_irqchip_create(s);\n> }\n>","headers":{"Return-Path":"","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 unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=a7jXi+zq;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-ppc-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fvzCp317jz1yDF\n\tfor ; Tue, 14 Apr 2026 19:16:06 +1000 (AEST)","from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from )\n\tid 1wCZsC-0001ZA-3v; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"7bit","Received-SPF":"pass client-ip=2a00:1450:4864:20::433;\n envelope-from=philmd@linaro.org; helo=mail-wr1-x433.google.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-ppc@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-ppc-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-ppc-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3677267,"web_url":"http://patchwork.ozlabs.org/comment/3677267/","msgid":"","list_archive_url":null,"date":"2026-04-14T15:32:44","subject":"Re: [PATCH for-11.0 v3] accel/kvm: return early from\n kvm_irqchip_create if kvm does not support irqchip","submitter":{"id":5111,"url":"http://patchwork.ozlabs.org/api/people/5111/","name":"Peter Maydell","email":"peter.maydell@linaro.org"},"content":"On Tue, 14 Apr 2026 at 05:59, Ani Sinha wrote:\n>\n> During refactoring of kvm_irqchip_create(), the refactored code was returning\n> early from do_kvm_irqchip_create() function if the required essential\n> capabilities were not present in KVM. This was not translating to an early\n> return from kvm_irqchip_create() as was the case before refactoring.\n> This is because, do_kvm_irqchip_create() did not have a means to notify the\n> caller of the lack of required kvm capabilities. Fix this by making\n> do_notify_irqchip_create() return EOPNOTSUPP error when capabilities\n> are absent and then the caller can check the return code and return early.\n>\n> Due to this regression during refactoring, all KVM guests on ppc64le hang\n> immediately during startup and this completely breaks all functionality on\n> that platform.\n>\n> Fixes: 98884e0cc1 (\"accel/kvm: add changes required to support KVM VM file descriptor change\")\n> Message-ID: <20260413090010.60339-1-anisinha@redhat.com>\n> Reported-by: Misbah Anjum N \n> Reported-by: Gautam Menghani \n> Suggested-by: Fabiano Rosas \n> Suggested-by: Harsh Prateek Bora \n> Tested-by: Misbah Anjum N \n> Reviewed-by: Peter Maydell \n> Signed-off-by: Ani Sinha \n> ---\n> accel/kvm/kvm-all.c | 11 ++++++++---\n> 1 file changed, 8 insertions(+), 3 deletions(-)\n\nThanks; I'm going to apply this directly to git so we can get it\ninto rc4.\n\n-- PMM","headers":{"Return-Path":"","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 unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=KzBw0YJK;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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Tue, 14 Apr 2026\n 08:32:57 -0700 (PDT)","MIME-Version":"1.0","References":"<20260414045911.63662-1-anisinha@redhat.com>","In-Reply-To":"<20260414045911.63662-1-anisinha@redhat.com>","From":"Peter Maydell ","Date":"Tue, 14 Apr 2026 16:32:44 +0100","X-Gm-Features":"AQROBzAtyFB4kKPLg59FH9PyakIZxRSXCgPUtK1ndhEU2FujvTw9Ai7FAomvh4M","Message-ID":"\n ","Subject":"Re: [PATCH for-11.0 v3] accel/kvm: return early from\n kvm_irqchip_create if kvm does not support irqchip","To":"Ani Sinha ","Cc":"Paolo Bonzini , qemu-ppc@nongnu.org,\n Misbah Anjum N ,\n Gautam Menghani ,\n Fabiano Rosas , Harsh Prateek Bora ,\n kvm@vger.kernel.org, qemu-devel@nongnu.org","Content-Type":"text/plain; charset=\"UTF-8\"","Received-SPF":"pass client-ip=2607:f8b0:4864:20::b134;\n envelope-from=peter.maydell@linaro.org; helo=mail-yx1-xb134.google.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-ppc@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-ppc-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-ppc-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}}]