From patchwork Thu Aug 17 22:01:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nuno Das Neves X-Patchwork-Id: 13357032 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2DCA7C678DF for ; Thu, 17 Aug 2023 22:02:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=sw3pwZ+fNmuKHzq9IECkS6NcermOebwHIeDDgToEYHA=; b=NovnAw6omnI9P6 kMS2K1/3Ej3Mg+tb9ldil83Z+zJT8rGx0La9cdIUzZSQSsGVtWaDW5ceCj7W44JWd0l22l/BbyDjm FQ0XH9y7m2QzcHGb0Tb00actL9cnQqtz+BHk4H+5FXQKRlgeS3zFB7Y4WjgddYJUkBjTTvDcx40xV v/WfDyaHGgMSDYTneNE5WhY/sTuSdzU8azpgRdtmdr5kc+xaxbsgO7JdXFmugN303QPsRBWeWS0tP gqmep/ThYSkSJ3vAp/qCvS7VUF4nEvJ0r4gDklni/LLd+Lb7C7NNxKSivokhpXE0/lRhO2kNn5Jsi YBUCapD/apSfUpfLx3lQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qWl4O-007Dbn-1J; Thu, 17 Aug 2023 22:02:20 +0000 Received: from linux.microsoft.com ([13.77.154.182]) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qWl47-007DRZ-0K for linux-arm-kernel@lists.infradead.org; Thu, 17 Aug 2023 22:02:04 +0000 Received: from linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net (linux.microsoft.com [13.77.154.182]) by linux.microsoft.com (Postfix) with ESMTPSA id 92DFD211F7D8; Thu, 17 Aug 2023 15:01:59 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 92DFD211F7D8 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1692309719; bh=kmnPKnD1YlAKNPwI6Gp4OR/KDSttof8GbD9MPFl6UlA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cvobZ94neO7cVcjeNPVqUzM/pqOQu2j4d3vLWUmAffoHeWyh25TtRDyUwlzcpgMBW P7gzWPu3NJ/nGAMjbT7OS47wX9Fl+lxoADbJSTB2NIrbfwxggJQwTtnyukfGVkTaiG DhekkKHKNUJthpTl1ebrFYQKj+7GouvE+zyImC0g= From: Nuno Das Neves To: linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-arch@vger.kernel.org Cc: patches@lists.linux.dev, mikelley@microsoft.com, kys@microsoft.com, wei.liu@kernel.org, haiyangz@microsoft.com, decui@microsoft.com, apais@linux.microsoft.com, Tianyu.Lan@microsoft.com, ssengar@linux.microsoft.com, mukeshrathor@microsoft.com, stanislav.kinsburskiy@gmail.com, jinankjain@linux.microsoft.com, vkuznets@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, will@kernel.org, catalin.marinas@arm.com Subject: [PATCH v2 08/15] Drivers: hv: Introduce per-cpu event ring tail Date: Thu, 17 Aug 2023 15:01:44 -0700 Message-Id: <1692309711-5573-9-git-send-email-nunodasneves@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1692309711-5573-1-git-send-email-nunodasneves@linux.microsoft.com> References: <1692309711-5573-1-git-send-email-nunodasneves@linux.microsoft.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230817_150203_209493_61EF3FBB X-CRM114-Status: GOOD ( 17.19 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add a pointer hv_synic_eventring_tail to track the tail pointer for the SynIC event ring buffer for each SINT. This will be used by the mshv driver, but must be tracked independently since the driver module could be removed and re-inserted. Signed-off-by: Nuno Das Neves Reviewed-by: Wei Liu --- drivers/hv/hv_common.c | 28 ++++++++++++++++++++++++++-- include/asm-generic/mshyperv.h | 2 ++ 2 files changed, 28 insertions(+), 2 deletions(-) diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c index 7364ef027cd7..0dd3091beef3 100644 --- a/drivers/hv/hv_common.c +++ b/drivers/hv/hv_common.c @@ -61,6 +61,16 @@ static void hv_kmsg_dump_unregister(void); static struct ctl_table_header *hv_ctl_table_hdr; +/* + * Per-cpu array holding the tail pointer for the SynIC event ring buffer + * for each SINT. + * + * We cannot maintain this in mshv driver because the tail pointer should + * persist even if the mshv driver is unloaded. + */ +u8 __percpu **hv_synic_eventring_tail; +EXPORT_SYMBOL_GPL(hv_synic_eventring_tail); + /* * Hyper-V specific initialization and shutdown code that is * common across all architectures. Called from architecture @@ -83,6 +93,9 @@ void __init hv_common_free(void) free_percpu(hyperv_pcpu_input_arg); hyperv_pcpu_input_arg = NULL; + + free_percpu(hv_synic_eventring_tail); + hv_synic_eventring_tail = NULL; } /* @@ -332,6 +345,8 @@ int __init hv_common_init(void) if (hv_root_partition) { hyperv_pcpu_output_arg = alloc_percpu(void *); BUG_ON(!hyperv_pcpu_output_arg); + hv_synic_eventring_tail = alloc_percpu(u8 *); + BUG_ON(hv_synic_eventring_tail == NULL); } hv_vp_index = kmalloc_array(num_possible_cpus(), sizeof(*hv_vp_index), @@ -356,6 +371,7 @@ int __init hv_common_init(void) int hv_common_cpu_init(unsigned int cpu) { void **inputarg, **outputarg; + u8 **synic_eventring_tail; u64 msr_vp_index; gfp_t flags; int pgcount = hv_root_partition ? 2 : 1; @@ -366,8 +382,8 @@ int hv_common_cpu_init(unsigned int cpu) inputarg = (void **)this_cpu_ptr(hyperv_pcpu_input_arg); /* - * hyperv_pcpu_input_arg and hyperv_pcpu_output_arg memory is already - * allocated if this CPU was previously online and then taken offline + * The per-cpu memory is already allocated if this CPU was previously + * online and then taken offline */ if (!*inputarg) { *inputarg = kmalloc(pgcount * HV_HYP_PAGE_SIZE, flags); @@ -377,6 +393,14 @@ int hv_common_cpu_init(unsigned int cpu) if (hv_root_partition) { outputarg = (void **)this_cpu_ptr(hyperv_pcpu_output_arg); *outputarg = (char *)(*inputarg) + HV_HYP_PAGE_SIZE; + synic_eventring_tail = (u8 **)this_cpu_ptr(hv_synic_eventring_tail); + *synic_eventring_tail = kcalloc(HV_SYNIC_SINT_COUNT, sizeof(u8), + flags); + + if (unlikely(!*synic_eventring_tail)) { + kfree(*inputarg); + return -ENOMEM; + } } } diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index 0c94d20b4d44..9118d678b27a 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -73,6 +73,8 @@ extern bool hv_nested; extern void * __percpu *hyperv_pcpu_input_arg; extern void * __percpu *hyperv_pcpu_output_arg; +extern u8 __percpu **hv_synic_eventring_tail; + extern u64 hv_do_hypercall(u64 control, void *inputaddr, void *outputaddr); extern u64 hv_do_fast_hypercall8(u16 control, u64 input8); extern bool hv_isolation_type_snp(void);