linux-kernel - [PATCH v2 1/6] PCI: hv: Don't load the driver for baremetal root partition

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Message-Id: <1751582677-30930-2-git-send-email-nunodasneves@linux.microsoft.com>
Date: Thu,  3 Jul 2025 15:44:32 -0700
From: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
To: linux-hyperv@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org,
	mhklinux@...look.com,
	tglx@...utronix.de,
	bhelgaas@...gle.com,
	romank@...ux.microsoft.com
Cc: kys@...rosoft.com,
	haiyangz@...rosoft.com,
	wei.liu@...nel.org,
	decui@...rosoft.com,
	catalin.marinas@....com,
	will@...nel.org,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	hpa@...or.com,
	lpieralisi@...nel.org,
	kw@...ux.com,
	robh@...nel.org,
	jinankjain@...ux.microsoft.com,
	skinsburskii@...ux.microsoft.com,
	mrathor@...ux.microsoft.com,
	x86@...nel.org,
	Nuno Das Neves <nunodasneves@...ux.microsoft.com>
Subject: [PATCH v2 1/6] PCI: hv: Don't load the driver for baremetal root partition

From: Mukesh Rathor <mrathor@...ux.microsoft.com>

The root partition only uses VMBus when running nested.

When running on baremetal the Hyper-V PCI driver is not needed,
so do not initialize it.

Signed-off-by: Mukesh Rathor <mrathor@...ux.microsoft.com>
Signed-off-by: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
Reviewed-by: Roman Kisel <romank@...ux.microsoft.com>
---
 drivers/pci/controller/pci-hyperv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index b4f29ee75848..4d25754dfe2f 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -4150,6 +4150,9 @@ static int __init init_hv_pci_drv(void)
 	if (!hv_is_hyperv_initialized())
 		return -ENODEV;
 
+	if (hv_root_partition() && !hv_nested)
+		return -ENODEV;
+
 	ret = hv_pci_irqchip_init();
 	if (ret)
 		return ret;
-- 
2.34.1