On 6/09/24 16:00, Adrian Hunter wrote: > Hi > > There is a long-standing problem whereby running Intel PT on host and guest > in Host/Guest mode, causes VM-Entry failure. > > The motivation for this patch set is to provide a fix for stable kernels > prior to the advent of the "Mediated Passthrough vPMU" patch set: > > https://lore.kernel.org/kvm/20240801045907.4010984-1-mizhang@xxxxxxxxxx/ > > which would render a large part of the fix unnecessary but likely not be > suitable for backport to stable due to its size and complexity. > > Ideally, this patch set would be applied before "Mediated Passthrough vPMU" > > Note that the fix does not conflict with "Mediated Passthrough vPMU", it > is just that "Mediated Passthrough vPMU" will make the code to stop and > restart Intel PT unnecessary. Any comments? > > > Adrian Hunter (3): > KVM: x86: Fix Intel PT IA32_RTIT_CTL MSR validation > KVM: x86: Fix Intel PT Host/Guest mode when host tracing also > KVM: selftests: Add guest Intel PT test > > arch/x86/events/intel/pt.c | 131 ++++++- > arch/x86/events/intel/pt.h | 10 + > arch/x86/include/asm/intel_pt.h | 4 + > arch/x86/kvm/vmx/vmx.c | 26 +- > arch/x86/kvm/vmx/vmx.h | 1 - > tools/testing/selftests/kvm/Makefile | 1 + > .../selftests/kvm/include/x86_64/processor.h | 1 + > tools/testing/selftests/kvm/x86_64/intel_pt.c | 381 +++++++++++++++++++++ > 8 files changed, 532 insertions(+), 23 deletions(-) > create mode 100644 tools/testing/selftests/kvm/x86_64/intel_pt.c > > base-commit: d45aab436cf06544abeeffc607110f559a3af3b4 > > > Regards > Adrian
