KVM: PPC: Book3S HV: Workaround POWER9 DD1.0 bug causing IPB bit loss

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This adds a workaround for a bug in POWER9 DD1 chips where changing
the CPPR (Current Processor Priority Register) can cause bits in the
IPB (Interrupt Pending Buffer) to get lost.  Thankfully it only
happens when manually manipulating CPPR which is quite rare.  When it
does happen it can cause interrupts to be delayed or lost.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

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Benjamin Herrenschmidt 2017-08-18 12:10:52 +10:00 • committed by Paul Mackerras

parent bd0fdb191c

commit 2c4fb78f78

1 changed files with 10 additions and 1 deletions

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arch/powerpc/kvm/book3s_xive_template.c

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