Re: [Qemu-ppc] [PATCH 0/2] PPC: kvm: Fix incorrect remapping of in-kernel MPIC

[Alexander Graf]

On 03.09.14 20:36, Bogdan Purcareata wrote:
> On target-ppc, the kvm-openpic memory region is part of the E500-CCSR memory
> region. On the kernel side, the MPIC is mapped at the same offset as the
> kvm-openpic within the address space.
> 
> When adding the PCI BAR0 memory region, an alias is created to point to the
> E500-CCSR memory region. This results in firing the kvm_openpic_region_add 
> once
> more, since kvm-openpic is part of the latter. Only this time, the offset is
> wrong - it's part of the PCI memory region. This leads to the in-kernel MPIC 
> to
> be remapped at a wrong address, and thus all traps to the kvm-openpic
> address to be emulated in userspace.
> 
> The fix consists in an additional filter in kvm_openpic_region_{add,del} to
> consider only addresses matching the start of the kvm-openpic memory region.

If this is true, wouldn't vhost and vfio be broken too?


Alex