Patches 1-2 address some small issues with documentation and the kvm selftests,
unrelated to the overall intent of this series.
Patch 3 applies the same PV MSR filtering mechanism to guest reads of KVM
paravirt msrs.
Patch 4 makes enabling KVM_CAP_ENFORCE_PV_FEATURE_CPUID idempotent with regards
to when userspace sets the guest's CPUID, ensuring that the cached copy of
KVM_CPUID_FEATURES.EAX is always current.
Patch 5 fixes a regression introduced with KVM_CAP_ENFORCE_PV_CPUID, wherein
the kvm masterclock isn't updated every time the guest uses a different system
time msr than before.
Lastly, Patch 6 introduces a test for the overall paravirtual restriction
mechanism, verifying that guests GP when touching MSRs they shouldn't and
get -KVM_ENOSYS when using restricted kvm hypercalls. Please note that this test
is dependent upon patches 1-3 of Aaron's userspace MSR test, which add support
for guest handling of the IDT in KVM selftests [1].
This series (along with Aaron's aforementioned changes) applies to
commit 77377064c3a9 ("KVM: ioapic: break infinite recursion on lazy
EOI").
[1] http://lore.kernel.org/r/20201012194716.3950330-1-aaronlewis@xxxxxxxxxx
Oliver Upton (6):
selftests: kvm: add tsc_msrs_test binary to gitignore
Documentation: kvm: fix ordering of msr filter, pv documentation
kvm: x86: reads of restricted pv msrs should also result in #GP
kvm: x86: ensure pv_cpuid.features is initialized when enabling cap
kvm: x86: request masterclock update any time guest uses different msr
selftests: kvm: test enforcement of paravirtual cpuid features
Documentation/virt/kvm/api.rst | 4 +-
arch/x86/kvm/cpuid.c | 23 +-
arch/x86/kvm/cpuid.h | 1 +
arch/x86/kvm/x86.c | 38 ++-
tools/testing/selftests/kvm/.gitignore | 2 +
tools/testing/selftests/kvm/Makefile | 1 +
.../testing/selftests/kvm/include/kvm_util.h | 2 +
.../selftests/kvm/include/x86_64/processor.h | 12 +
tools/testing/selftests/kvm/lib/kvm_util.c | 28 +++
.../selftests/kvm/lib/x86_64/processor.c | 29 +++
.../selftests/kvm/x86_64/kvm_pv_test.c | 234 ++++++++++++++++++
11 files changed, 364 insertions(+), 10 deletions(-)
create mode 100644 tools/testing/selftests/kvm/x86_64/kvm_pv_test.c
--
2.29.0.rc2.309.g374f81d7ae-goog
