KVM: Avoid guest virtual addresses in string pio userspace interface

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The current string pio interface communicates using guest virtual addresses,
relying on userspace to translate addresses and to check permissions.  This
interface cannot fully support guest smp, as the check needs to take into
account two pages at one in case an unaligned string transfer straddles a
page boundary.

Change the interface not to communicate guest addresses at all; instead use
a buffer page (mmaped by userspace) and do transfers there.  The kernel
manages the virtual to physical translation and can perform the checks
atomically by taking the appropriate locks.

Signed-off-by: Avi Kivity <avi@qumranet.com>

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This commit is contained in:

Avi Kivity 2007-03-20 12:46:50 +02:00

parent f0fe510864

commit 039576c03c

6 changed files with 238 additions and 66 deletions

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21

drivers/kvm/kvm.h

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183

drivers/kvm/kvm_main.c

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9

drivers/kvm/mmu.c

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40

drivers/kvm/svm.c

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40

drivers/kvm/vmx.c

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11

include/linux/kvm.h

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