Re: [Xen-devel] [PATCH 1/2] x2APIC: translate IO-APIC entries when enabling the IOMMU

["Roger Pau Monné" <roger.pau@citrix.com>]

On Thu, Oct 10, 2019 at 01:03:38PM +0200, Roger Pau Monne wrote:
> When interrupt remapping is enabled as part of enabling x2APIC the
> IO-APIC entries also need to be translated to the new format and added
> to the interrupt remapping table.
> 
> This prevents IOMMU interrupt remapping faults when booting on
> hardware that has unmasked IO-APIC pins.
> 
> Reported-by: Andrew Cooper <andrew.cooper3@citrix.com>
> Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
> ---
> Cc: Juergen Gross <jgross@suse.com>
> ---
>  xen/arch/x86/apic.c           | 12 ++++++++++--
>  xen/arch/x86/io_apic.c        |  5 +++--
>  xen/include/asm-x86/io_apic.h |  3 ++-
>  3 files changed, 15 insertions(+), 5 deletions(-)
> 
> diff --git a/xen/arch/x86/apic.c b/xen/arch/x86/apic.c
> index 6cdb50cf41..9810de7473 100644
> --- a/xen/arch/x86/apic.c
> +++ b/xen/arch/x86/apic.c
> @@ -515,7 +515,7 @@ static void resume_x2apic(void)
>      iommu_enable_x2apic();
>      __enable_x2apic();
>  
> -    restore_IO_APIC_setup(ioapic_entries);
> +    restore_IO_APIC_setup(ioapic_entries, true);
>      unmask_8259A();
>  
>  out:
> @@ -887,6 +887,7 @@ void __init x2apic_bsp_setup(void)
>  {
>      struct IO_APIC_route_entry **ioapic_entries = NULL;
>      const char *orig_name;
> +    bool iommu_enabled = true;

There's no need for this local variable, x2apic_enabled can be used
instead.

Will send a new version, sorry.

Roger.

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