From: David Woodhouse <dwmw@amazon.co.uk>
Date: Fri, 23 Oct 2020 16:54:46 +0000 (+0100)
Subject: iommu/hyper-v: Disable IRQ pseudo-remapping if 15 bit APIC IDs are available
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=ff502e44a57907b8d274d4e9697767a2f6d51367;p=users%2Fdwmw2%2Flinux.git

iommu/hyper-v: Disable IRQ pseudo-remapping if 15 bit APIC IDs are available

If the 15-bit APIC ID support is present in emulated MSI then there's no
need for the pseudo-remapping support.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---

diff --git a/drivers/iommu/hyperv-iommu.c b/drivers/iommu/hyperv-iommu.c
index a629a6be65c7e..9438daa24fdb2 100644
--- a/drivers/iommu/hyperv-iommu.c
+++ b/drivers/iommu/hyperv-iommu.c
@@ -121,6 +121,7 @@ static int __init hyperv_prepare_irq_remapping(void)
 	int i;
 
 	if (!hypervisor_is_type(X86_HYPER_MS_HYPERV) ||
+	    x86_init.hyper.msi_ext_dest_id() ||
 	    !x2apic_supported())
 		return -ENODEV;