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authorPaul Mackerras <paulus@samba.org>2013-04-17 20:31:41 +0000
committerAlexander Graf <agraf@suse.de>2013-04-26 20:27:32 +0200
commit4619ac88b72c43c622ef1eae3069de0e6f2cba9d (patch)
treeba512ee99fba576f86cdf99a9bce1e8d0420abcc /arch/powerpc/kvm/book3s_xics.c
parente7d26f285b4be9466c9e393139e1c9cffe4cedfc (diff)
KVM: PPC: Book3S HV: Improve real-mode handling of external interrupts
This streamlines our handling of external interrupts that come in while we're in the guest. First, when waking up a hardware thread that was napping, we split off the "napping due to H_CEDE" case earlier, and use the code that handles an external interrupt (0x500) in the guest to handle that too. Secondly, the code that handles those external interrupts now checks if any other thread is exiting to the host before bouncing an external interrupt to the guest, and also checks that there is actually an external interrupt pending for the guest before setting the LPCR MER bit (mediated external request). This also makes sure that we clear the "ceded" flag when we handle a wakeup from cede in real mode, and fixes a potential infinite loop in kvmppc_run_vcpu() which can occur if we ever end up with the ceded flag set but MSR[EE] off. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
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