31 lines
1.0 KiB
Diff
31 lines
1.0 KiB
Diff
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References: bnc#694863
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# HG changeset patch
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# User Jan Beulich <jbeulich@suse.com>
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# Date 1321864171 -3600
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# Node ID 9c350ab8d3ea64866421de756ab2bf3daaf63187
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# Parent 335e8273a3f34a5e2972643a028f83684609f1c1
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x86/vioapic: clear remote IRR when switching RTE to edge triggered mode
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Xen itself (as much as Linux) relies on this behavior, so it should
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also emulate it properly. Not doing so reportedly gets in the way of
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kexec inside a HVM guest.
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Signed-off-by: Jan Beulich <jbeulich@suse.com>
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Tested-by: Olaf Hering <olaf@aepfle.de>
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--- a/xen/arch/x86/hvm/vioapic.c
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+++ b/xen/arch/x86/hvm/vioapic.c
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@@ -154,8 +154,9 @@ static void vioapic_write_redirent(
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{
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vlapic_adjust_i8259_target(d);
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}
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- else if ( (ent.fields.trig_mode == VIOAPIC_LEVEL_TRIG) &&
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- !ent.fields.mask &&
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+ else if ( ent.fields.trig_mode == VIOAPIC_EDGE_TRIG )
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+ pent->fields.remote_irr = 0;
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+ else if ( !ent.fields.mask &&
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!ent.fields.remote_irr &&
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hvm_irq->gsi_assert_count[idx] )
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{
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