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is_isa_irq_masked
2007 Dec 11
0
[HVM] Fix interrupt routing
...nt, Fedora 7 disables PIT interrupt by
"vioapic.redirtbl[2].mask = 1, vpic.imr.bit0 = 0 (unmasked),
vlapic.lvt[LINT0].mask = 1", and enables vlapic timer interrupt
generating;
In vmx_intr_assist() -> pt_update_irq(), we always choose IRQ0 rather
than vlapic timer interrupt, because: 1) is_isa_irq_masked(v, 0) returns
false due to vpic.imr.bit0 = 0; 2) the PIT''s pt->last_plt_gtime is less
than vlapic timer''s -- at least I can see this on my hosts;
However, in pt_update_irq() -> hvm_isa_irq_assert() ->
vioapic_irq_positive_edge(), we do nothing but return at once becaus...