On Tue, Aug 27, 2019 at 09:10:11PM +0800, Peter Xu wrote: > The work is based on Thomas's s390 port for dirty_log_test. > > This series originates from "[PATCH] KVM: selftests: Detect max PA > width from cpuid" [1] and one of Drew's comments - instead of keeping > the hackish line to overwrite guest_pa_bits all the time, this series > introduced the new mode VM_MODE_PXXV48_4K for x86_64 platform. > > The major issue is that even all the x86_64 kvm selftests are > currently using the guest mode VM_MODE_P52V48_4K, many x86_64 hosts > are not using 52 bits PA (and in most cases, far less). If with luck > we could be having 48 bits hosts, but it's more adhoc (I've observed 3 > x86_64 systems, they are having different PA width of 36, 39, 48). I > am not sure whether this is happening to the other archs as well, but > it probably makes sense to bring the x86_64 tests to the real world on > always using the correct PA bits. > > A side effect of this series is that it will also fix the crash we've > encountered on Xeon E3-1220 as mentioned [1] due to the > differenciation of PA width. > > With [1], we've observed AMD host issues when with NPT=off. However a > funny fact is that after I reworked into this series, the tests can > instead pass on both NPT=on/off. It could be that the series changes > vm->pa_bits or other fields so something was affected. I didn't dig > more on that though, considering we should not lose anything. > > Any kind of smoke test would be greatly welcomed (especially on s390 > or ARM). Same to comments. Thanks, > The patches didn't apply cleanly for me on 9e8312f5e160, but once I got them applied I was able to run the aarch64 tests. > [1] https://lkml.org/lkml/2019/8/26/141 > > Peter Xu (4): > KVM: selftests: Move vm type into _vm_create() internally > KVM: selftests: Create VM earlier for dirty log test > KVM: selftests: Introduce VM_MODE_PXXV48_4K > KVM: selftests: Remove duplicate guest mode handling > > tools/testing/selftests/kvm/dirty_log_test.c | 78 +++++-------------- > .../testing/selftests/kvm/include/kvm_util.h | 17 +++- > .../selftests/kvm/lib/aarch64/processor.c | 3 + > tools/testing/selftests/kvm/lib/kvm_util.c | 77 ++++++++++++++---- > .../selftests/kvm/lib/x86_64/processor.c | 8 +- > 5 files changed, 107 insertions(+), 76 deletions(-) > > -- > 2.21.0 > Thanks, drew
