KVM: Handle virtualization instruction #UD faults during reboot

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KVM turns off hardware virtualization extensions during reboot, in order
to disassociate the memory used by the virtualization extensions from the
processor, and in order to have the system in a consistent state.
Unfortunately virtual machines may still be running while this goes on,
and once virtualization extensions are turned off, any virtulization
instruction will #UD on execution.

Fix by adding an exception handler to virtualization instructions; if we get
an exception during reboot, we simply spin waiting for the reset to complete.
If it's a true exception, BUG() so we can have our stack trace.

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

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This commit is contained in:

Avi Kivity 2008-05-13 13:23:38 +03:00

parent 1b7fcd3263

commit 4ecac3fd6d

4 changed files with 64 additions and 20 deletions

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20

arch/x86/kvm/svm.c

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25

arch/x86/kvm/vmx.c

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24

include/asm-x86/kvm_host.h

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15

virt/kvm/kvm_main.c

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