linux-dev/tools/testing/selftests/kvm/x86_64/hyperv_clock.c, branch linus/master

KVM: selftests: Make hyperv_clock selftest more stable

2022-06-07T15:28:50Z

hyperv_clock doesn't always give a stable test result, especially with AMD CPUs. The test compares Hyper-V MSR clocksource (acquired either with rdmsr() from within the guest or KVM_GET_MSRS from the host) against rdtsc(). To increase the accuracy, increase the measured delay (done with nop loop) by two orders of magnitude and take the mean rdtsc() value before and after rdmsr()/KVM_GET_MSRS. Reported-by: Maxim Levitsky Signed-off-by: Vitaly Kuznetsov Reviewed-by: Maxim Levitsky Tested-by: Maxim Levitsky Message-Id: <20220601144322.1968742-1-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini

KVM: selftests: fix hyperv_clock test

2021-08-04T13:43:03Z

The test was mistakenly using addr_gpa2hva on a gva and that happened to work accidentally. Commit 106a2e766eae ("KVM: selftests: Lower the min virtual address for misc page allocations") revealed this bug. Fixes: 2c7f76b4c42b ("selftests: kvm: Add basic Hyper-V clocksources tests", 2021-03-18) Signed-off-by: Maxim Levitsky Message-Id: <20210804112057.409498-1-mlevitsk@redhat.com> Signed-off-by: Paolo Bonzini

KVM: selftests: Add helpers to allocate N pages of virtual memory

2021-06-24T08:31:18Z

Add wrappers to allocate 1 and N pages of memory using de facto standard values as the defaults for minimum virtual address, data memslot, and page table memslot. Convert all compatible users. No functional change intended. Signed-off-by: Sean Christopherson Message-Id: <20210622200529.3650424-7-seanjc@google.com> Signed-off-by: Paolo Bonzini

KVM: selftests: move Hyper-V MSR definitions to hyperv.h

2021-06-17T17:09:45Z

These defines can be shared by multiple tests, move them to a dedicated header. Signed-off-by: Vitaly Kuznetsov Signed-off-by: Paolo Bonzini Message-Id: <20210521095204.2161214-29-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini

selftests: kvm: Check that TSC page value is small after KVM_SET_CLOCK(0)

2021-04-01T09:14:19Z

Add a test for the issue when KVM_SET_CLOCK(0) call could cause TSC page value to go very big because of a signedness issue around hv_clock->system_time. Signed-off-by: Vitaly Kuznetsov Message-Id: <20210326155551.17446-3-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini

selftests: kvm: Add basic Hyper-V clocksources tests

2021-03-18T15:38:58Z

Introduce a new selftest for Hyper-V clocksources (MSR-based reference TSC and TSC page). As a starting point, test the following: 1) Reference TSC is 1Ghz clock. 2) Reference TSC and TSC page give the same reading. 3) TSC page gets updated upon KVM_SET_CLOCK call. 4) TSC page does not get updated when guest opted for reenlightenment. 5) Disabled TSC page doesn't get updated. Signed-off-by: Vitaly Kuznetsov Message-Id: <20210318140949.1065740-1-vkuznets@redhat.com> [Add a host-side test using TSC + KVM_GET_MSR too. - Paolo] Signed-off-by: Paolo Bonzini