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Doc: add interrupt storm mitigation explanation. 

Tracked-On: #866
Signed-off-by: Minggui Cao <minggui.cao@intel.com>
Acked-by: Geoffroy Van Cutsem <geoffroy.vancutsem@intel.com>
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Minggui Cao 2018-09-04 12:09:43 +08:00 committed by wenlingz
parent d8c4619ee9
commit bfcf546180
1 changed files with 10 additions and 0 deletions
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10
doc/developer-guides/interrupt-hld.rst
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@ -451,6 +451,16 @@ a guest's vMSI. The handler then injects the corresponding virtual
interrupt into the guest, based on vPIC/vIOAPIC/vLAPIC APIs described
earlier.
Interrupt Storm Mitigation
==========================
When the Device Model (DM) launches a User OS (UOS), the ACRN hypervisor
will remap the interrupt for this user OS's pass-through devices. When
an interrupt occurs for a pass-through device, the CPU core is assigned
to that User OS gets trapped into the hypervisor. The benefit of such a
mechanism is that, should an interrupt storm happen in a particular UOS,
it will have only a minimal effect on the performance of the Service OS.
Interrupt/Exception Injection Process
=====================================