From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 856A91D6DB5; Thu, 23 Apr 2026 12:42:26 +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=1776948147; cv=none; b=NDt9bhw/yk9A7BlfK4MrxWSeWExcOHHwd0RApk7fOOjEBuGMqooCXc9F7wfzIPh18oSNfZSuXS19dAjSOw123ODuJlypo5lJ42EUa6BfecnJ2qfhwsKg8BAZt5aSOVxTgg+3xoji2Tl7FKpYriOeS5Yc3KDIadStbDZkXwHMjCI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776948147; c=relaxed/simple; bh=gNYAnUIiKY0dORHx1+xnjVbI2nukScfNAsanmDS/YPk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=j5nF7G6UhEepofKNgrhIXycabAV3AiWxsFqCONSkZpEGeU3z0fTJkTm8W8TwCey5yVHF2e9sMctRuexwnSmsiHv42ZsalQTYRRn7xu+8++J8qzBw1CDHDvuhjNRL+QWqSK3wIIifiqYS3p+zAQ59K11P2lK6SCJfxqOt5rSLGow= 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=sdJr3BxS; 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="sdJr3BxS" Received: from CPC-namja-026ON.redmond.corp.microsoft.com (unknown [4.213.232.18]) by linux.microsoft.com (Postfix) with ESMTPSA id 2833120B7168; Thu, 23 Apr 2026 05:42:18 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 2833120B7168 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1776948146; bh=I2iUOz06N9pWMf1bIo71EnFA9O21Frf4P70pvQqdric=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sdJr3BxSKfa5DEwVFAHUFBYZT3CYc4MAfq8UWukagegS/A86yvkIHkLGL8iNV/AmX sZQvA8TInk618z9cr/L8VcWhIK1vnpLV8JbFypwHHhnWweLdVlRRK6x4v0dVdtqL1i 5HUfRb7io3Hlx8KeTctmRzzkcsl9Mi34N8U1zmHM= From: Naman Jain To: "K . Y . Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Catalin Marinas , Will Deacon , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Arnd Bergmann , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Michael Kelley Cc: Marc Zyngier , Timothy Hayes , Lorenzo Pieralisi , Sascha Bischoff , mrigendrachaubey , Naman Jain , linux-hyperv@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-riscv@lists.infradead.org, vdso@mailbox.org, ssengar@linux.microsoft.com Subject: [PATCH v2 01/15] arm64: smp: Export arch_smp_send_reschedule for mshv_vtl module Date: Thu, 23 Apr 2026 12:41:51 +0000 Message-ID: <20260423124206.2410879-2-namjain@linux.microsoft.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260423124206.2410879-1-namjain@linux.microsoft.com> References: <20260423124206.2410879-1-namjain@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit mshv_vtl_main.c calls smp_send_reschedule() which expands to arch_smp_send_reschedule(). When CONFIG_MSHV_VTL=m, the module cannot access this symbol since it is not exported on arm64. smp_send_reschedule() is used in mshv_vtl_cancel() to interrupt a vCPU thread running on another CPU. When a vCPU is looping in mshv_vtl_ioctl_return_to_lower_vtl(), it checks a per-CPU cancel flag before each VTL0 entry. Setting cancel=1 alone is not enough if the target CPU thread is sleeping - the IPI from smp_send_reschedule() kicks the remote CPU out of idle/sleep so it re-checks the cancel flag and exits the loop promptly. Other architectures (riscv, loongarch, powerpc) already export this symbol. Add the same EXPORT_SYMBOL_GPL for arm64. This is required for adding arm64 support in MSHV_VTL. Reviewed-by: Michael Kelley Reviewed-by: Roman Kisel Signed-off-by: Naman Jain --- arch/arm64/kernel/smp.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 1aa324104afb..26b1a4456ceb 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -1152,6 +1152,7 @@ void arch_smp_send_reschedule(int cpu) { smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE); } +EXPORT_SYMBOL_GPL(arch_smp_send_reschedule); #ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL void arch_send_wakeup_ipi(unsigned int cpu) -- 2.43.0