KVM: PPC: Book3S PR: Avoid changing TS bits when exiting guest

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PR KVM host usually runs with TM enabled in its host MSR value, and
with non-transactional TS value.

When a guest with TM active traps into PR KVM host, the rfid at the
tail of kvmppc_interrupt_pr() will try to switch TS bits from
S0 (Suspended & TM disabled) to N1 (Non-transactional & TM enabled).

That will leads to TM Bad Thing interrupt.

This patch manually sets target TS bits unchanged to avoid this
exception.

Signed-off-by: Simon Guo <wei.guo.simon@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

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Simon Guo 2018-05-23 15:01:55 +08:00 • committed by Paul Mackerras

parent 401a89e937

commit 36383a0862

1 changed files with 13 additions and 0 deletions

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arch/powerpc/kvm/book3s_segment.S

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