linux-kernel - [PATCH v3 04/17] iommu/hyperv: don't setup IRQ remapping when running as root

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Date:   Tue, 24 Nov 2020 17:07:31 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Linux on Hyper-V List <linux-hyperv@...r.kernel.org>
Cc:     virtualization@...ts.linux-foundation.org,
        Linux Kernel List <linux-kernel@...r.kernel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Vineeth Pillai <viremana@...ux.microsoft.com>,
        Sunil Muthuswamy <sunilmut@...rosoft.com>,
        Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
        Wei Liu <wei.liu@...nel.org>, Joerg Roedel <jroedel@...e.de>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Joerg Roedel <joro@...tes.org>,
        iommu@...ts.linux-foundation.org (open list:IOMMU DRIVERS)
Subject: [PATCH v3 04/17] iommu/hyperv: don't setup IRQ remapping when running as root

The IOMMU code needs more work. We're sure for now the IRQ remapping
hooks are not applicable when Linux is the root partition.

Signed-off-by: Wei Liu <wei.liu@...nel.org>
Acked-by: Joerg Roedel <jroedel@...e.de>
Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 drivers/iommu/hyperv-iommu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/hyperv-iommu.c b/drivers/iommu/hyperv-iommu.c
index e09e2d734c57..8d3ce3add57d 100644
--- a/drivers/iommu/hyperv-iommu.c
+++ b/drivers/iommu/hyperv-iommu.c
@@ -20,6 +20,7 @@
 #include <asm/io_apic.h>
 #include <asm/irq_remapping.h>
 #include <asm/hypervisor.h>
+#include <asm/mshyperv.h>
 
 #include "irq_remapping.h"
 
@@ -143,7 +144,7 @@ static int __init hyperv_prepare_irq_remapping(void)
 	int i;
 
 	if (!hypervisor_is_type(X86_HYPER_MS_HYPERV) ||
-	    !x2apic_supported())
+	    !x2apic_supported() || hv_root_partition)
 		return -ENODEV;
 
 	fn = irq_domain_alloc_named_id_fwnode("HYPERV-IR", 0);
-- 
2.20.1