linux-kernel - [PATCH v5 04/16] iommu/hyperv: don't setup IRQ remapping when running as root

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Message-Id: <20210120120058.29138-5-wei.liu@kernel.org>
Date:   Wed, 20 Jan 2021 12:00:46 +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>,
        pasha.tatashin@...een.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>, Will Deacon <will@...nel.org>,
        iommu@...ts.linux-foundation.org (open list:IOMMU DRIVERS)
Subject: [PATCH v5 04/16] 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 1d21a0b5f724..b7db6024e65c 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"
 
@@ -122,7 +123,7 @@ static int __init hyperv_prepare_irq_remapping(void)
 
 	if (!hypervisor_is_type(X86_HYPER_MS_HYPERV) ||
 	    x86_init.hyper.msi_ext_dest_id() ||
-	    !x2apic_supported())
+	    !x2apic_supported() || hv_root_partition)
 		return -ENODEV;
 
 	fn = irq_domain_alloc_named_id_fwnode("HYPERV-IR", 0);
-- 
2.20.1