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doc:Update hypercall and upcall

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update hld for hypercall and upcall

Signed-off-by: Mingqiang Chi <mingqiang.chi@intel.com>
This commit is contained in:
Mingqiang Chi
2019-10-15 12:08:12 +08:00
committed by deb-intel
parent 6f9367a50c
commit 343aabca4b
4 changed files with 35 additions and 14 deletions
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6
doc/developer-guides/hld/hv-interrupt.rst
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@@ -358,13 +358,13 @@ IPI Management
The only purpose of IPI use in HV is to kick a vCPU out of non-root mode
and enter to HV mode. This requires I/O request and virtual interrupt
injection be distributed to different IPI vectors. The I/O request uses
IPI vector 0xF4 upcall. The virtual interrupt injection uses IPI vector 0xF0.
IPI vector 0xF3 upcall. The virtual interrupt injection uses IPI vector 0xF0.
0xF4 upcall
0xF3 upcall
A Guest vCPU VM Exit exits due to EPT violation or IO instruction trap.
It requires Device Module to emulate the MMIO/PortIO instruction.
However it could be that the Service OS (SOS) vCPU0 is still in non-root
mode. So an IPI (0xF4 upcall vector) should be sent to the physical CPU0
mode. So an IPI (0xF3 upcall vector) should be sent to the physical CPU0
(with non-root mode as vCPU0 inside SOS) to force vCPU0 to VM Exit due
to the external interrupt. The virtual upcall vector is then injected to
SOS, and the vCPU0 inside SOS then will pick up the IO request and do