[tip: x86/apic] iommu/hyper-v: Disable IRQ pseudo-remapping if 15 bit APIC IDs are available

[tip-bot2 for David Woodhouse]

The following commit has been merged into the x86/apic branch of tip:

Commit-ID:     bf27ef8a77d8da38c9f35f8f6aab013a2dcf175f
Gitweb:        https://git.kernel.org/tip/bf27ef8a77d8da38c9f35f8f6aab013a2dcf175f
Author:        David Woodhouse <dwmw@xxxxxxxxxxxx>
AuthorDate:    Sat, 24 Oct 2020 22:35:33 +01:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Wed, 28 Oct 2020 20:26:31 +01:00

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@xxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20201024213535.443185-34-dwmw2@xxxxxxxxxxxxx

---
 drivers/iommu/hyperv-iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/hyperv-iommu.c b/drivers/iommu/hyperv-iommu.c
index a629a6b..9438daa 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;