From patchwork Fri Mar 14 19:28:54 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nuno Das Neves X-Patchwork-Id: 873886 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4E3FE204F8E; Fri, 14 Mar 2025 19:29:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741980568; cv=none; b=YzokIn7JVEA3dmQ5p9T8sMeQ36kKfALkctoLkiWDoJCmdBH1c7XRGosmdlYxKmAVmmSeXBh+JgXdEWtIrO8zsYQzy1FWk1ma810tSfNXhmGh/nPSxsP6kgTwknzzntBaa6oNhQzf7pYrGo5R+HF51DxYngI/gaKuXBQ6a6s0ZEs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741980568; c=relaxed/simple; bh=xnpR0/VxxndmXycR3GDsP0BGBRHAo7SPBEvQ8uPzWtU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=hk4vLhPUGk3zhEcEZMMqXqmadhVc/h1wkdsh7nGSoG+YN4ICkvaSuMRIkhM5YDr4X2d6Yz/XVSLf4K7VOMzFr0gZ1JTFqyOck2jX6wlS5/rhdsZi+f6I0863Vja9jG9rfNNnyzgaL0qWsHa7PXzBtIC+Aopup3xXSi4grY5TD/s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=mRJf/GPb; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="mRJf/GPb" Received: from linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net (linux.microsoft.com [13.77.154.182]) by linux.microsoft.com (Postfix) with ESMTPSA id EEA942038F38; Fri, 14 Mar 2025 12:29:24 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com EEA942038F38 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1741980565; bh=Dqrq7DAoDmvEjgrCRa2NkON5cNDrn4Qu2Ew1/bm/cis=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mRJf/GPbhQYrzHp1rvtjepy82nTzU1PTujkRaZz2FCzlCELBWCBTdnqYW4OI6wkNu fJm+YhFk/pgz/qPlmQ9D/jBuliw/VhbKHYZzQ0X9UcC6kdIYD9OZyZPxxqgrkpaxrs iHMp51UVnktOsTcYyeO6RWKhO198OVt7DQadNCZ4= From: Nuno Das Neves To: linux-hyperv@vger.kernel.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, mhklinux@outlook.com, ltykernel@gmail.com, stanislav.kinsburskiy@gmail.com, linux-acpi@vger.kernel.org, eahariha@linux.microsoft.com, jeff.johnson@oss.qualcomm.com Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, daniel.lezcano@linaro.org, joro@8bytes.org, robin.murphy@arm.com, arnd@arndb.de, jinankjain@linux.microsoft.com, muminulrussell@gmail.com, skinsburskii@linux.microsoft.com, mrathor@linux.microsoft.com, ssengar@linux.microsoft.com, apais@linux.microsoft.com, gregkh@linuxfoundation.org, vkuznets@redhat.com, prapal@linux.microsoft.com, anrayabh@linux.microsoft.com, rafael@kernel.org, lenb@kernel.org, corbet@lwn.net Subject: [PATCH v6 08/10] x86: hyperv: Add mshv_handler() irq handler and setup function Date: Fri, 14 Mar 2025 12:28:54 -0700 Message-Id: <1741980536-3865-9-git-send-email-nunodasneves@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1741980536-3865-1-git-send-email-nunodasneves@linux.microsoft.com> References: <1741980536-3865-1-git-send-email-nunodasneves@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Add mshv_handler() to process messages related to managing guest partitions such as intercepts, doorbells, and scheduling messages. In a (non-nested) root partition, the same interrupt vector is shared between the vmbus and mshv_root drivers. Introduce a stub for mshv_handler() and call it in sysvec_hyperv_callback alongside vmbus_handler(). Even though both handlers will be called for every Hyper-V interrupt, the messages for each driver are delivered to different offsets within the SYNIC message page, so they won't step on each other. Signed-off-by: Nuno Das Neves Reviewed-by: Wei Liu Reviewed-by: Tianyu Lan --- arch/x86/kernel/cpu/mshyperv.c | 9 +++++++++ drivers/hv/hv_common.c | 5 +++++ include/asm-generic/mshyperv.h | 1 + 3 files changed, 15 insertions(+) diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index fcd0e066d9bd..3e2533954675 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -107,6 +107,7 @@ void hv_set_msr(unsigned int reg, u64 value) } EXPORT_SYMBOL_GPL(hv_set_msr); +static void (*mshv_handler)(void); static void (*vmbus_handler)(void); static void (*hv_stimer0_handler)(void); static void (*hv_kexec_handler)(void); @@ -117,6 +118,9 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_hyperv_callback) struct pt_regs *old_regs = set_irq_regs(regs); inc_irq_stat(irq_hv_callback_count); + if (mshv_handler) + mshv_handler(); + if (vmbus_handler) vmbus_handler(); @@ -126,6 +130,11 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_hyperv_callback) set_irq_regs(old_regs); } +void hv_setup_mshv_handler(void (*handler)(void)) +{ + mshv_handler = handler; +} + void hv_setup_vmbus_handler(void (*handler)(void)) { vmbus_handler = handler; diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c index 3cd9b96ffc67..b3b11be11650 100644 --- a/drivers/hv/hv_common.c +++ b/drivers/hv/hv_common.c @@ -680,6 +680,11 @@ void __weak hv_remove_vmbus_handler(void) } EXPORT_SYMBOL_GPL(hv_remove_vmbus_handler); +void __weak hv_setup_mshv_handler(void (*handler)(void)) +{ +} +EXPORT_SYMBOL_GPL(hv_setup_mshv_handler); + void __weak hv_setup_kexec_handler(void (*handler)(void)) { } diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index 8519b8ec8e9d..ccccb1cbf7df 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -208,6 +208,7 @@ void hv_setup_kexec_handler(void (*handler)(void)); void hv_remove_kexec_handler(void); void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs)); void hv_remove_crash_handler(void); +void hv_setup_mshv_handler(void (*handler)(void)); extern int vmbus_interrupt; extern int vmbus_irq;