KVM: PPC: Book3S HV: Don't let VCPU sleep if it has a doorbell pending

Browse source

It is possible, through a narrow race condition, for a VCPU to exit
the guest with a H_CEDE hypercall while it has a doorbell interrupt
pending.  In this case, the H_CEDE should return immediately, but in
fact it puts the VCPU to sleep until some other interrupt becomes
pending or a prod is received (via another VCPU doing H_PROD).

This fixes it by checking the DPDES (Directed Privileged Doorbell
Exception Status) bit for the thread along with the other interrupt
pending bits.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

...

This commit is contained in:

Paul Mackerras 2017-05-19 16:26:16 +10:00

parent 1bc3fe818c

commit 1da4e2f4fb

1 changed files with 22 additions and 3 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

25

arch/powerpc/kvm/book3s_hv.c

View file