Li, Fei1 86f5993bc9 hv: vlapic: fix tpr virtualization when VID is not enabled. ...

1) According SDM Vol 3, Chap 29.1.2, Any VM exit caused by TPR virtualization
is trap-like: the instruction causing TPR virtualization completes before the VM
exit occurs (for example, the value of CS:RIP saved in the guest-state area of
the VMCS references the next instruction). So we need to retain the RIP.
2) The previous implement only consides the situation the guest will reduce the
TPR. However, the guest will increase it. So we need to update the PPR before we
find a deliverable interrupt. For examples: a) if the guest increase the TPR before
a irq windows vmexit, we need to update the PPR when check whether there has a pending
delivery interrupt or not; b) if the guest increase the TPR, then an external irq raised,
we need to update the PPR when check whether there has a deliverable interrupt to inject
to guest.

Tracked-On: #1842
Signed-off-by: Li, Fei1 <fei1.li@intel.com>
Reviewed-by: Yu Wang <yu1.wang@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>

2019-05-15 08:59:39 +08:00

..

x86

hv: vlapic: fix tpr virtualization when VID is not enabled.

2019-05-15 08:59:39 +08:00