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[PULL,52/91] intel_iommu: Fix irqchip / X2APIC configuration checks

Message ID 20220516095448.507876-53-mst@redhat.com
State New
Headers show
Series [PULL,01/91] virtio: fix feature negotiation for ACCESS_PLATFORM | expand

Commit Message

Michael S. Tsirkin May 16, 2022, 10:38 a.m. UTC 
From: David Woodhouse <dwmw2@infradead.org>

We don't need to check kvm_enable_x2apic(). It's perfectly OK to support
interrupt remapping even if we can't address CPUs above 254. Kind of
pointless, but still functional.

The check on kvm_enable_x2apic() needs to happen *anyway* in order to
allow CPUs above 254 even without an IOMMU, so allow that to happen
elsewhere.

However, we do require the *split* irqchip in order to rewrite I/OAPIC
destinations. So fix that check while we're here.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Acked-by: Claudio Fontana <cfontana@suse.de>
Message-Id: <20220314142544.150555-4-dwmw2@infradead.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/i386/intel_iommu.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)
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Patch

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index d3361c8313..d310532108 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -3786,15 +3786,10 @@  static bool vtd_decide_config(IntelIOMMUState *s, Error **errp)
                                               ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
     }
     if (s->intr_eim == ON_OFF_AUTO_ON && !s->buggy_eim) {
-        if (!kvm_irqchip_in_kernel()) {
+        if (!kvm_irqchip_is_split()) {
             error_setg(errp, "eim=on requires accel=kvm,kernel-irqchip=split");
             return false;
         }
-        if (!kvm_enable_x2apic()) {
-            error_setg(errp, "eim=on requires support on the KVM side"
-                             "(X2APIC_API, first shipped in v4.7)");
-            return false;
-        }
     }
 
     /* Currently only address widths supported are 39 and 48 bits */