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author | Marcelo Tosatti <mtosatti@redhat.com> | 2008-09-24 20:28:34 -0300 |
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committer | Avi Kivity <avi@redhat.com> | 2008-10-15 14:25:28 +0200 |
commit | e48258009d941891fca35348986b8d280caf31cd (patch) | |
tree | 73d1fb56a9fc22c1e55160bb04e772bd6b2244fb /include | |
parent | 582801a95d2f2ceab841779e1dec0e11dfec44c0 (diff) | |
download | kernel_samsung_smdk4412-e48258009d941891fca35348986b8d280caf31cd.zip kernel_samsung_smdk4412-e48258009d941891fca35348986b8d280caf31cd.tar.gz kernel_samsung_smdk4412-e48258009d941891fca35348986b8d280caf31cd.tar.bz2 |
KVM: PIC: enhance IPI avoidance
The PIC code makes little effort to avoid kvm_vcpu_kick(), resulting in
unnecessary guest exits in some conditions.
For example, if the timer interrupt is routed through the IOAPIC, IRR
for IRQ 0 will get set but not cleared, since the APIC is handling the
acks.
This means that everytime an interrupt < 16 is triggered, the priority
logic will find IRQ0 pending and send an IPI to vcpu0 (in case IRQ0 is
not masked, which is Linux's case).
Introduce a new variable isr_ack to represent the IRQ's for which the
guest has been signalled / cleared the ISR. Use it to avoid more than
one IPI per trigger-ack cycle, in addition to the avoidance when ISR is
set in get_priority().
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions