From 0f7b6f91ac1bbfd33b23c291b14874b9561909d2 Mon Sep 17 00:00:00 2001 From: Andrew Cooper Date: Wed, 20 Mar 2013 10:00:01 +0100 Subject: [PATCH] AMD/IOMMU: Process softirqs while building dom0 iommu mappings Recent changes which have made their way into xen-4.2 stable have pushed the runtime of construct_dom0() over 5 seconds, which has caused regressions in XenServer testing because of our 5 second watchdog. The root cause is that amd_iommu_dom0_init() does not process softirqs and in particular the nmi_timer which causes the watchdog to decide that no useful progress is being made. This patch adds periodic calls to process_pending_softirqs() at the same interval as the Intel variant of this function. The server which was failing with the watchdog test now boots reliably with a timeout of 1 second. Signed-off-by: Andrew Cooper --- xen/drivers/passthrough/amd/pci_amd_iommu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/xen/drivers/passthrough/amd/pci_amd_iommu.c b/xen/drivers/passthrough/amd/pci_amd_iommu.c index 2098e419a6..60696d74d8 100644 --- a/xen/drivers/passthrough/amd/pci_amd_iommu.c +++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c @@ -317,6 +317,9 @@ static void __init amd_iommu_dom0_init(struct domain *d) if ( mfn_valid(pfn) ) amd_iommu_map_page(d, pfn, pfn, IOMMUF_readable|IOMMUF_writable); + + if ( !(i & 0xfffff) ) + process_pending_softirqs(); } } -- 2.39.5