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KVM: x86: ioapic: Clear Remote IRR when entry is switched to edge-triggered 

Some OSes (Linux, Xen) use this behavior to clear the Remote IRR bit for
IOAPICs without an EOI register. They simulate the EOI message manually
by changing the trigger mode to edge and then back to level, with the
entry being masked during this.

QEMU implements this feature in commit ed1263c363c9
("ioapic: clear remote irr bit for edge-triggered interrupts")

As a side effect, this commit removes an incorrect behavior where Remote
IRR was cleared when the redirection table entry was rewritten. This is not
consistent with the manual and also opens an opportunity for a strange
behavior when a redirection table entry is modified from an interrupt
handler that handles the same entry: The modification will clear the
Remote IRR bit even though the interrupt handler is still running.

Signed-off-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Wanpeng Li <wanpeng.li@hotmail.com>
Reviewed-by: Steve Rutherford <srutherford@google.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Nikita Leshenko 2017-11-05 15:52:32 +02:00 committed by Paolo Bonzini
parent 7d2253684d
commit a8bfec2930
1 changed files with 10 additions and 1 deletions
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11
arch/x86/kvm/ioapic.c
View File

@ -304,8 +304,17 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
} else {
e->bits &= ~0xffffffffULL;
e->bits |= (u32) val;
e->fields.remote_irr = 0;
}
/*
* Some OSes (Linux, Xen) assume that Remote IRR bit will
* be cleared by IOAPIC hardware when the entry is configured
* as edge-triggered. This behavior is used to simulate an
* explicit EOI on IOAPICs that don't have the EOI register.
*/
if (e->fields.trig_mode == IOAPIC_EDGE_TRIG)
e->fields.remote_irr = 0;
mask_after = e->fields.mask;
if (mask_before != mask_after)
kvm_fire_mask_notifiers(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index, mask_after);