It turns out that not only do we not follow the SDM guidelines for
reseting MTRR state on vCPU reset, but we really don't even attempt
to keep KVM MTRR state synchronized with QEMU, which affects not
only reset, but migration. This series implements the get/put MSR
support for KVM, then goes on to properly re-initialize the state on
vCPU reset. This resolves the problem described in the last patch
as well as some potential mismatches around migration. The migration
state is unchanged, other than actually passing valid data.
Thanks to Laszlo for his help debugging this and realization of how
terribly broken MTRR synchronization is. Thanks,
Alex
---
Alex Williamson (3):
x86: Clear MTRRs on vCPU reset
x86: kvm: Add MTRR support for kvm_get|put_msrs()
x86: Use common variable range MTRR counts
target-i386/cpu.c | 10 +++++
target-i386/cpu.h | 4 +-
target-i386/kvm.c | 101 ++++++++++++++++++++++++++++++++++++++++++++++++-
target-i386/machine.c | 2 -
4 files changed, 113 insertions(+), 4 deletions(-)
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