From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EA49621C9EA; Fri, 17 Oct 2025 15:57:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760716676; cv=none; b=eivupdSeZUxdEUM1a5MuPhADYnrbwnijfNcq+geb9osMNYPfD0L9paqZaBg/+rp6mJBy0/IWkFbMpyShDTxffBUfkmKZ0E9oqaEXvhT/Cng1xTe4ssUDFo3/rnhvzFKqqcDGa49v0CXXCjiZvvOQ40FR+C/8+21y7zlTbTEaV2k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760716676; c=relaxed/simple; bh=qnfxW1elFxW/JaVs3f6V/362lrPzeg+F5Igv5BRrYsc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TQt8RYZE6591EAtXDq6G4FR986W7zzUARFni5/7HKzCCP312+OMCB4Tm3rGT+iiFCs4lCBnSLe7i6dx+Xxbdrs5M1fODu6Q6oGhiRaznxaZFe7hO2KoZyQSIg5ywybL+YX9TVDk92nGgSP8X5RZM1OXexmiWkG1YWqXWnW1rbW4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=BP6/rb3R; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="BP6/rb3R" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6A788C4CEE7; Fri, 17 Oct 2025 15:57:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1760716675; bh=qnfxW1elFxW/JaVs3f6V/362lrPzeg+F5Igv5BRrYsc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BP6/rb3RD/FfVhwZ8gwefAeB2l4I66/zkUhM9oSFeX0/yT3MgPpcHF8aGHifqke/Z giMRyASR6G4q5wgdUY28Ix+jJ8cLEZ6RDYTq+q2D+Wa0Zq5W70umKCDUsV1zT2vNcL LCh6tRzBKj6uYkZ2GGz+KLo9zdEu6OnVy0J4g6iw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jason Andryuk , Juergen Gross , Sasha Levin Subject: [PATCH 5.15 272/276] xen/events: Update virq_to_irq on migration Date: Fri, 17 Oct 2025 16:56:05 +0200 Message-ID: <20251017145152.420161020@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251017145142.382145055@linuxfoundation.org> References: <20251017145142.382145055@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jason Andryuk [ Upstream commit 3fcc8e146935415d69ffabb5df40ecf50e106131 ] VIRQs come in 3 flavors, per-VPU, per-domain, and global, and the VIRQs are tracked in per-cpu virq_to_irq arrays. Per-domain and global VIRQs must be bound on CPU 0, and bind_virq_to_irq() sets the per_cpu virq_to_irq at registration time Later, the interrupt can migrate, and info->cpu is updated. When calling __unbind_from_irq(), the per-cpu virq_to_irq is cleared for a different cpu. If bind_virq_to_irq() is called again with CPU 0, the stale irq is returned. There won't be any irq_info for the irq, so things break. Make xen_rebind_evtchn_to_cpu() update the per_cpu virq_to_irq mappings to keep them update to date with the current cpu. This ensures the correct virq_to_irq is cleared in __unbind_from_irq(). Fixes: e46cdb66c8fc ("xen: event channels") Cc: stable@vger.kernel.org Signed-off-by: Jason Andryuk Reviewed-by: Juergen Gross Signed-off-by: Juergen Gross Message-ID: <20250828003604.8949-4-jason.andryuk@amd.com> [ Adjust context ] Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/xen/events/events_base.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -1820,9 +1820,20 @@ static int xen_rebind_evtchn_to_cpu(stru * virq or IPI channel, which don't actually need to be rebound. Ignore * it, but don't do the xenlinux-level rebind in that case. */ - if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_vcpu, &bind_vcpu) >= 0) + if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_vcpu, &bind_vcpu) >= 0) { + int old_cpu = info->cpu; + bind_evtchn_to_cpu(evtchn, tcpu, false); + if (info->type == IRQT_VIRQ) { + int virq = info->u.virq; + int irq = per_cpu(virq_to_irq, old_cpu)[virq]; + + per_cpu(virq_to_irq, old_cpu)[virq] = -1; + per_cpu(virq_to_irq, tcpu)[virq] = irq; + } + } + do_unmask(info, EVT_MASK_REASON_TEMPORARY); return 0;