linux-kernel - [PATCH] xen: Add support for XenServer 6.1 platform device

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Message-ID: <20250225140400.23992-1-frediano.ziglio@cloud.com>
Date: Tue, 25 Feb 2025 14:03:53 +0000
From: Frediano Ziglio <frediano.ziglio@...ud.com>
To: xen-devel@...ts.xenproject.org,
	linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Cc: Frediano Ziglio <frediano.ziglio@...ud.com>,
	"Juergen Gross" <jgross@...e.com>,
	"Stefano Stabellini" <sstabellini@...nel.org>,
	"Oleksandr Tyshchenko" <oleksandr_tyshchenko@...m.com>,
	"Bjorn Helgaas" <bhelgaas@...gle.com>
Subject: [PATCH] xen: Add support for XenServer 6.1 platform device

On XenServer on Windows machine a platform device with ID 2 instead of
1 is used.
This device is mainly identical to device 1 but due to some Windows
update behaviour it was decided to use a device with a different ID.
This causes compatibility issues with Linux which expects, if Xen
is detected, to find a Xen platform device (5853:0001) otherwise code
will crash due to some missing initialization (specifically grant
tables).
The device 2 is presented by Xapi adding device specification to
Qemu command line.

Signed-off-by: Frediano Ziglio <frediano.ziglio@...ud.com>
---
 drivers/xen/platform-pci.c | 2 ++
 include/linux/pci_ids.h    | 1 +
 2 files changed, 3 insertions(+)

diff --git a/drivers/xen/platform-pci.c b/drivers/xen/platform-pci.c
index 544d3f9010b9..9cefc7d6bcba 100644
--- a/drivers/xen/platform-pci.c
+++ b/drivers/xen/platform-pci.c
@@ -174,6 +174,8 @@ static int platform_pci_probe(struct pci_dev *pdev,
 static const struct pci_device_id platform_pci_tbl[] = {
 	{PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM,
 		PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+	{PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM_XS61,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 	{0,}
 };
 
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index 1a2594a38199..e4791fd97ee0 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -3241,6 +3241,7 @@
 
 #define PCI_VENDOR_ID_XEN		0x5853
 #define PCI_DEVICE_ID_XEN_PLATFORM	0x0001
+#define PCI_DEVICE_ID_XEN_PLATFORM_XS61	0x0002
 
 #define PCI_VENDOR_ID_OCZ		0x1b85
 
-- 
2.48.1