commit aeee078a87aa2ccde9b4ee5c7a9c827eb2b925b1
Author: Aaron LI <a...@aaronly.me>
Date: Tue Jun 15 07:26:03 2021 +0800
nvmm: Fix SVM TSS restore on DragonFly
In DragonFly, PCPU(tss_gdt) points directly to the gdt[] entry for the
current CPU's TSS descriptor; while NetBSD's CPUVAR(GDT) points to the
gdtstore[] table. Fix that 'and' instruction so it works on DragonFly.
(Credit to Matt Dillon for debugging and fixing this.)
The 'and' instruction clears the busy bit (bit 41) so the TSS descriptor
becomes "available" for the reloading, as required by 'ltr' instruction.
(The TSS descriptor was in use prior to launching the guest so it has
been marked busy.)
Credit:
* Illumos: Bug #13029: AMD bhyve should reload TSS ASAP
https://www.illumos.org/issues/13029
* Illumos: 13029 AMD bhyve should reload TSS ASAP
https://github.com/illumos/illumos-gate/commit/4d3fdeb14779bb6b0838521971d9ac99d65b0572
Summary of changes:
sys/dev/virtual/nvmm/x86/nvmm_x86_svmfunc.S | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/aeee078a87aa2ccde9b4ee5c7a9c827eb2b925b1
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DragonFly BSD source repository
