AMD IOMMU: don't assign preallocated protection domains to devices

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In isolation mode the protection domains for the devices are
preallocated and preassigned. This is bad if a device should be passed
to a virtualization guest because the IOMMU code does not know if it is
in use by a driver. This patch changes the code to assign the device to
the preallocated domain only if there are dma mapping requests for it.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Joerg Roedel 2008-09-11 10:24:48 +02:00 • committed by Ingo Molnar

parent b39ba6ad00

commit bd60b735c6

2 changed files with 44 additions and 5 deletions

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43

arch/x86/kernel/amd_iommu.c

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6

include/asm-x86/amd_iommu_types.h

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