On Fri, 20 May 2011 14:36:09 -0500
Kumar Gala [off-list ref] wrote:

On May 20, 2011, at 2:00 PM, Scott Wood wrote:

quoted

In general we will not have EE soft-disabled or be napping when
these exceptions happen, but still it is not correct.

The guest doorbell exceptions can only be triggered with MSR[GS]=1,
and thus for host kernel nesting purposes are base-level exceptions.

Note that ehpriv and hypercall are triggerable from normal userspace.
I tested that the process gets properly signalled in this case.

Signed-off-by: Scott Wood <redacted>
---
arch/powerpc/include/asm/reg_booke.h |    2 +
arch/powerpc/kernel/exceptions-64e.S |   67 ++++++++++++++++++++++++++--------
2 files changed, 53 insertions(+), 16 deletions(-)

Can you look at a similar patch for 32-bit fsl-booke so we handle HV exceptions if they happen to get generated, maybe something already exists for KVM.

Yes.

-Scott