CVS commit: src

["Maxime Villard" <maxv%netbsd.org@localhost>]

Module Name:    src
Committed By:   maxv
Date:           Sun Jan  6 16:10:51 UTC 2019

Modified Files:
        src/lib/libnvmm: libnvmm.3 libnvmm_x86.c nvmm.h
        src/sys/dev/nvmm: nvmm.c nvmm.h
        src/sys/dev/nvmm/x86: nvmm_x86.h nvmm_x86_svm.c

Log Message:
Improvements and fixes in NVMM.

Kernel driver:

 * Don't take an extra (unneeded) reference to the UAO.

 * Provide npc for HLT. I'm not really happy with it right now, will
   likely be revisited.

 * Add the INT_SHADOW, INT_WINDOW_EXIT and NMI_WINDOW_EXIT states. Provide
   them in the exitstate too.

 * Don't take the TPR into account when processing INTs. The virtualizer
   can do that itself (Qemu already does).

 * Provide a hypervisor signature in CPUID, and hide SVM.

 * Ignore certain MSRs. One special case is MSR_NB_CFG in which we set
   NB_CFG_INITAPICCPUIDLO. Allow reads of MSR_TSC.

 * If the LWP has pending signals or softints, leave, rather than waiting
   for a rescheduling to happen later. This reduces interrupt processing
   time in the guest (Qemu sends a signal to the thread, and now we leave
   right away). This could be improved even more by sending an actual IPI
   to the CPU, but I'll see later.

Libnvmm:

 * Fix the MMU translation of large pages, we need to add the lower bits
   too.

 * Change the IO and Mem structures to take a pointer rather than a
   static array. This provides more flexibility.

 * Batch together the str+rep IO transactions. We do one big memory
   read/write, and then send the IO commands to the hypervisor all at
   once. This considerably increases performance.

 * Decode MOVZX.

With these changes in place, Qemu+NVMM works. I can install NetBSD 8.0
in a VM with multiple VCPUs, connect to the network, etc.


To generate a diff of this commit:
cvs rdiff -u -r1.6 -r1.7 src/lib/libnvmm/libnvmm.3
cvs rdiff -u -r1.9 -r1.10 src/lib/libnvmm/libnvmm_x86.c
cvs rdiff -u -r1.4 -r1.5 src/lib/libnvmm/nvmm.h
cvs rdiff -u -r1.4 -r1.5 src/sys/dev/nvmm/nvmm.c
cvs rdiff -u -r1.1 -r1.2 src/sys/dev/nvmm/nvmm.h
cvs rdiff -u -r1.2 -r1.3 src/sys/dev/nvmm/x86/nvmm_x86.h
cvs rdiff -u -r1.9 -r1.10 src/sys/dev/nvmm/x86/nvmm_x86_svm.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.