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Revision 358848


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Author: mr
Date: Tue Mar 10 16:53:49 2020 UTC (4 years, 7 months ago)
Changed paths: 3
Log Message:
Untangle TPR shadowing and APIC virtualization.
This speeds up Windows guests tremendously.

The patch does:
Add a new tuneable 'hw.vmm.vmx.use_tpr_shadowing' to disable TLP shadowing.
Also add 'hw.vmm.vmx.cap.tpr_shadowing' to be able to query if TPR shadowing is used.

Detach the initialization of TPR shadowing from the initialization of APIC virtualization.
APIC virtualization still needs TPR shadowing, but not vice versa.
Any CPU that supports APIC virtualization should also support TPR shadowing.

When TPR shadowing is used, the APIC page of each vCPU is written to the VMCS_VIRTUAL_APIC field of the VMCS
so that the CPU can write directly to the page without intercept.

On vm exit, vlapic_update_ppr() is called to update the PPR.

Submitted by:	Yamagi Burmeister
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D22942


Changed paths

Path Details
Directoryhead/sys/amd64/vmm/intel/vmx.c modified , text changed
Directoryhead/sys/amd64/vmm/io/vlapic.c modified , text changed
Directoryhead/sys/amd64/vmm/io/vlapic.h modified , text changed

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