Re: [Xen-devel] [PATCH] intel/iommu: setup inclusive mappings before enabling iommu

[Dario Faggioli <dfaggioli@xxxxxxxx>]

On Fri, 2018-09-14 at 10:02 +0200, Roger Pau Monne wrote:
> Or else it can lead to freezes when enabling the iommu on certain
> Intel hardware:
> 
> [...]
> (XEN) ELF: addresses:
> (XEN)     virt_base        = 0xffffffff80000000
> (XEN)     elf_paddr_offset = 0x0
> (XEN)     virt_offset      = 0xffffffff80000000
> (XEN)     virt_kstart      = 0xffffffff81000000
> (XEN)     virt_kend        = 0xffffffff82953000
> (XEN)     virt_entry       = 0xffffffff8274e180
> (XEN)     p2m_base         = 0x8000000000
> (XEN)  Xen  kernel: 64-bit, lsb, compat32
> (XEN)  Dom0 kernel: 64-bit, PAE, lsb, paddr 0x1000000 -> 0x295300
> 
> This restores the behavior before commit 66a9274cc3435 that changed
> the order and enabled the iommu without having the inclusive mappings
> setup.
> 
> Note that in order to restore previous behavior a new enable hook is
> added to the iommu_ops struct that's only used by VT-d.
> 
> Reported-by: Dario Faggioli <dfaggioli@xxxxxxxx>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>
My box (the one that was freezing with current staging) boots fine if I
apply this patch.

Tested-by: Dario Faggioli <dfaggioli@xxxxxxxx>

Thanks,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Software Engineer @ SUSE https://www.suse.com/

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