From b7d2063177a584cb1afb06fc0ed6c48b576f3e75 Mon Sep 17 00:00:00 2001 From: Feng Wu Date: Fri, 18 Sep 2015 22:29:56 +0800 Subject: [PATCH] iommu/vt-d: Add a command line parameter for VT-d posted-interrupts Enable VT-d Posted-Interrtups and add a command line parameter for it. Signed-off-by: Feng Wu Reviewed-by: Paolo Bonzini Reviewed-by: Alex Williamson Acked-by: Joerg Roedel Signed-off-by: Paolo Bonzini --- Documentation/kernel-parameters.txt | 1 + drivers/iommu/irq_remapping.c | 12 ++++++++---- 2 files changed, 9 insertions(+), 4 deletions(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 22a4b687ea5b..73588fcaff8c 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1553,6 +1553,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted. nosid disable Source ID checking no_x2apic_optout BIOS x2APIC opt-out request will be ignored + nopost disable Interrupt Posting iomem= Disable strict checking of access to MMIO memory strict regions from userspace. diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c index 913455a5fd40..8adaaeae3268 100644 --- a/drivers/iommu/irq_remapping.c +++ b/drivers/iommu/irq_remapping.c @@ -22,7 +22,7 @@ int irq_remap_broken; int disable_sourceid_checking; int no_x2apic_optout; -int disable_irq_post = 1; +int disable_irq_post = 0; static int disable_irq_remap; static struct irq_remap_ops *remap_ops; @@ -58,14 +58,18 @@ static __init int setup_irqremap(char *str) return -EINVAL; while (*str) { - if (!strncmp(str, "on", 2)) + if (!strncmp(str, "on", 2)) { disable_irq_remap = 0; - else if (!strncmp(str, "off", 3)) + disable_irq_post = 0; + } else if (!strncmp(str, "off", 3)) { disable_irq_remap = 1; - else if (!strncmp(str, "nosid", 5)) + disable_irq_post = 1; + } else if (!strncmp(str, "nosid", 5)) disable_sourceid_checking = 1; else if (!strncmp(str, "no_x2apic_optout", 16)) no_x2apic_optout = 1; + else if (!strncmp(str, "nopost", 6)) + disable_irq_post = 1; str += strcspn(str, ","); while (*str == ',')