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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 <feng.wu@intel.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Feng Wu 2015-09-18 22:29:56 +08:00 committed by Paolo Bonzini
parent bf9f6ac8d7
commit b7d2063177
2 changed files with 9 additions and 4 deletions
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1
Documentation/kernel-parameters.txt
View File

@ -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.

12
drivers/iommu/irq_remapping.c
View File

@ -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 == ',')