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Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1toAtd-0000000D5he-0iKF; Sat, 01 Mar 2025 00:40:01 +0000 Received: from linux.microsoft.com ([13.77.154.182]) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1toAs4-0000000D5KQ-3SW8 for linux-arm-kernel@lists.infradead.org; Sat, 01 Mar 2025 00:38:25 +0000 Received: from [10.0.0.114] (c-67-182-156-199.hsd1.wa.comcast.net [67.182.156.199]) by linux.microsoft.com (Postfix) with ESMTPSA id 297612038A22; Fri, 28 Feb 2025 16:38:22 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 297612038A22 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1740789502; bh=KckT26d6nP7QZ+/ykn1bui1INDXn2fKcmCtw1s0XLcA=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=duIgKnzi0YqTq8nTW9lxdfwU+lhdDZ68Vr54Cm+FjinsQ//tXQ7RD7UbvDDOFpnVx sYy/xwGAy3qPvhtmpRTpd5Dfusaj2uSOkBm0IIB6rTEsHLeoFoJdheCAczw3nq9Pta L5r2XPnSPzFfbwnylYl8fKpNlQQ9xS/sED3vuer0= Message-ID: <7de9b06d-9a32-48b5-beda-2e19b36ae9c9@linux.microsoft.com> Date: Fri, 28 Feb 2025 16:38:19 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 08/10] x86: hyperv: Add mshv_handler irq handler and setup function To: Stanislav Kinsburskii Cc: linux-hyperv@vger.kernel.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-acpi@vger.kernel.org, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, mhklinux@outlook.com, 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, mrathor@linux.microsoft.com, ssengar@linux.microsoft.com, apais@linux.microsoft.com, Tianyu.Lan@microsoft.com, stanislav.kinsburskiy@gmail.com, gregkh@linuxfoundation.org, vkuznets@redhat.com, prapal@linux.microsoft.com, muislam@microsoft.com, anrayabh@linux.microsoft.com, rafael@kernel.org, lenb@kernel.org, corbet@lwn.net References: <1740611284-27506-1-git-send-email-nunodasneves@linux.microsoft.com> <1740611284-27506-9-git-send-email-nunodasneves@linux.microsoft.com> Content-Language: en-US From: Nuno Das Neves In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250228_163824_913121_DFB48F02 X-CRM114-Status: GOOD ( 16.25 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2/26/2025 3:43 PM, Stanislav Kinsburskii wrote: > On Wed, Feb 26, 2025 at 03:08:02PM -0800, Nuno Das Neves wrote: >> This will handle SYNIC interrupts such as intercepts, doorbells, and >> scheduling messages intended for the mshv driver. >> >> 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 0116d0e96ef9..616e9a5d77b4 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(); > > Can mshv_handler be defined as a weak symbol doing nothing instead > of defining it a null pointer? > This should allow to simplify this code and get rid of > hv_setup_mshv_handler, which looks redundant. > Interesting, I tested this and it does seems to work! It seems like a good change, thanks. > Reviewed-by: Stanislav Kinsburskii > >> + >> 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 2763cb6d3678..f5a07fd9a03b 100644 >> --- a/drivers/hv/hv_common.c >> +++ b/drivers/hv/hv_common.c >> @@ -677,6 +677,11 @@ 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 1f46d19a16aa..a05f12e63ccd 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; >> -- >> 2.34.1 >>