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 CFD3920E6E3; Mon, 2 Jun 2025 14:35:03 +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=1748874903; cv=none; b=mvdlPHM3m59ciwJAhDcTfZRqhF1oGathkPf7YnYZlvBSwRJENgroQpEoac/GezIvN4ZynGJukB/zmVUnhCO/NjcC0L1Q5SvWaEzs5u6l4fMmLSprnClbgXVeZFmW0rnfzgDpdHt3+BemNu71tanANF7dRCNBTUXT6TD0eraibzk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748874903; c=relaxed/simple; bh=9T9V4wlDZOY4gkR9qgDuADFVE80/eYljUO3C/xT1smA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NRukO2JtYFcCeDOCDATUXxnbpUgPjJZZe+vUFSHFe8yWIl9W8r6diubj1aBk/kLwzcwP6VBkcOZaTF4awvLPRocnS+3jG9AiOr3hSpUcvh0w/FqAP5NOkbGilpYw02UQtDcsoV6X2YEyHPqBqdFI4Jwv7npDT+rU5ltCmyD7snc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=bGcw3Pvk; 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="bGcw3Pvk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3EB31C4CEEB; Mon, 2 Jun 2025 14:35:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1748874903; bh=9T9V4wlDZOY4gkR9qgDuADFVE80/eYljUO3C/xT1smA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bGcw3Pvkre6GL0joTHRdsZNqA5JPacS58qi+qOBFs8EVz1GQSfIwc4+6eMod4tbkY +ab9NL/RVCAWR/hMIRSJeiDHQQGdDVidzRqIoRGD5EInU5v8L49xJkbNje5HPh/ZVn 486mDMv3qORuX/eufQ1CzTJNLyt8R3kK03jSzELg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jason Andryuk , Stefano Stabellini , Juergen Gross , Sasha Levin Subject: [PATCH 5.4 169/204] xenbus: Allow PVH dom0 a non-local xenstore Date: Mon, 2 Jun 2025 15:48:22 +0200 Message-ID: <20250602134302.294097208@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250602134255.449974357@linuxfoundation.org> References: <20250602134255.449974357@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jason Andryuk [ Upstream commit 90989869baae47ee2aa3bcb6f6eb9fbbe4287958 ] Make xenbus_init() allow a non-local xenstore for a PVH dom0 - it is currently forced to XS_LOCAL. With Hyperlaunch booting dom0 and a xenstore stubdom, dom0 can be handled as a regular XS_HVM following the late init path. Ideally we'd drop the use of xen_initial_domain() and just check for the event channel instead. However, ARM has a xen,enhanced no-xenstore mode, where the event channel and PFN would both be 0. Retain the xen_initial_domain() check, and use that for an additional check when the event channel is 0. Check the full 64bit HVM_PARAM_STORE_EVTCHN value to catch the off chance that high bits are set for the 32bit event channel. Signed-off-by: Jason Andryuk Change-Id: I5506da42e4c6b8e85079fefb2f193c8de17c7437 Reviewed-by: Stefano Stabellini Signed-off-by: Juergen Gross Message-ID: <20250506204456.5220-1-jason.andryuk@amd.com> Signed-off-by: Sasha Levin --- drivers/xen/xenbus/xenbus_probe.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c index fd686b962727a..17705f82f85fd 100644 --- a/drivers/xen/xenbus/xenbus_probe.c +++ b/drivers/xen/xenbus/xenbus_probe.c @@ -881,9 +881,15 @@ static int __init xenbus_init(void) if (xen_pv_domain()) xen_store_domain_type = XS_PV; if (xen_hvm_domain()) + { xen_store_domain_type = XS_HVM; - if (xen_hvm_domain() && xen_initial_domain()) - xen_store_domain_type = XS_LOCAL; + err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v); + if (err) + goto out_error; + xen_store_evtchn = (int)v; + if (!v && xen_initial_domain()) + xen_store_domain_type = XS_LOCAL; + } if (xen_pv_domain() && !xen_start_info->store_evtchn) xen_store_domain_type = XS_LOCAL; if (xen_pv_domain() && xen_start_info->store_evtchn) @@ -902,10 +908,6 @@ static int __init xenbus_init(void) xen_store_interface = gfn_to_virt(xen_store_gfn); break; case XS_HVM: - err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v); - if (err) - goto out_error; - xen_store_evtchn = (int)v; err = hvm_get_parameter(HVM_PARAM_STORE_PFN, &v); if (err) goto out_error; -- 2.39.5