search for: x2apic_bsp_setup

...th the consequences). This could have the nice side effect of allowing to use "iommu=off" even when x2APIC was pre-enabled by the BIOS (in which case interrupt remapping is a requirement, but DMA translation [obviously] isn''t), but that doesn''t currently work (and hence x2apic_bsp_setup() forces the IOMMU on rather than just interrupt remapping). For consistency with VT-d, make the AMD IOMMU code also skip all ACPI table parsing when neither iommu_enable nor iommu_intremap are set. Signed-off-by: Jan Beulich <jbeulich@suse.com> --- a/xen/arch/x86/apic.c +++ b/xen/arch/x86...

x86:x2apic: Disable x2apic on x86-32 permanently x2apic initialization on x86_32 uses vcpu pointer before it is initialized. As x2apic is unlikely to be used on x86_32, this patch disables x2apic permanently on x86_32. It also asserts the sanity of vcpu pointer before dereference to prevent further misuse. Signed-off-by: Fengzhe Zhang <fengzhe.zhang@intel.com> diff -r 02c0af2bf280

http://www.intel.com/content/www/us/en/chipsets/5520-and-5500-chipset-ioh-specification-update.html Stepping B-3 has two errata (#47 and #53) related to Interrupt remapping, to which the workaround is for the BIOS to completely disable interrupt remapping. These errata are fixed in stepping C-2. Unfortunately this chipset is very common and many BIOSes are not disabling remapping. We can

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> --- This affects Xen 4.2 and 4.1, so I propose it for backport. diff -r 24df082ff3e7 -r 7bc81065d2d5 xen/arch/x86/apic.c --- a/xen/arch/x86/apic.c +++ b/xen/arch/x86/apic.c @@ -970,8 +970,7 @@ void __init x2apic_bsp_setup(void) panic("Interrupt remapping could not be enabled while " "x2APIC is already enabled by BIOS!\n"); - printk("Would not enable x2APIC due to interrupt remapping " - "cannot be enabled.\n"); + pr...