linux-dev/tools/testing/selftests/kvm/include/perf_test_util.h, branch linus/master

KVM: selftests: Add option to run dirty_log_perf_test vCPUs in L2

2022-06-09T14:52:27Z

Add an option to dirty_log_perf_test that configures the vCPUs to run in L2 instead of L1. This makes it possible to benchmark the dirty logging performance of nested virtualization, which is particularly interesting because KVM must shadow L1's EPT/NPT tables. For now this support only works on x86_64 CPUs with VMX. Otherwise passing -n results in the test being skipped. Signed-off-by: David Matlack Message-Id: <20220520233249.3776001-11-dmatlack@google.com> Signed-off-by: Paolo Bonzini

KVM: selftests: Move vCPU thread creation and joining to common helpers

2021-11-16T12:43:28Z

Move vCPU thread creation and joining to common helper functions. This is in preparation for the next commit which ensures that all vCPU threads are fully created before entering guest mode on any one vCPU. No functional change intended. Signed-off-by: David Matlack Reviewed-by: Ben Gardon Message-Id: <20211111001257.1446428-3-dmatlack@google.com> Signed-off-by: Paolo Bonzini

KVM: selftests: Sync perf_test_args to guest during VM creation

2021-11-16T12:43:27Z

Copy perf_test_args to the guest during VM creation instead of relying on the caller to do so at their leisure. Ideally, tests wouldn't even be able to modify perf_test_args, i.e. they would have no motivation to do the sync, but enforcing that is arguably a net negative for readability. No functional change intended. [Set wr_fract=1 by default and add helper to override it since the new access_tracking_perf_test needs to set it dynamically.] Signed-off-by: Sean Christopherson Signed-off-by: David Matlack Reviewed-by: Ben Gardon Message-Id: <20211111000310.1435032-13-dmatlack@google.com> Signed-off-by: Paolo Bonzini

KVM: selftests: Fill per-vCPU struct during "perf_test" VM creation

2021-11-16T12:43:27Z

Fill the per-vCPU args when creating the perf_test VM instead of having the caller do so. This helps ensure that any adjustments to the number of pages (and thus vcpu_memory_bytes) are reflected in the per-VM args. Automatically filling the per-vCPU args will also allow a future patch to do the sync to the guest during creation. Signed-off-by: Sean Christopherson [Updated access_tracking_perf_test as well.] Signed-off-by: David Matlack Reviewed-by: Ben Gardon Message-Id: <20211111000310.1435032-12-dmatlack@google.com> Signed-off-by: Paolo Bonzini

KVM: selftests: Remove perf_test_args.host_page_size

2021-11-16T12:43:26Z

Remove perf_test_args.host_page_size and instead use getpagesize() so that it's somewhat obvious that, for tests that care about the host page size, they care about the system page size, not the hardware page size, e.g. that the logic is unchanged if hugepages are in play. No functional change intended. Signed-off-by: Sean Christopherson Reviewed-by: Ben Gardon Signed-off-by: David Matlack Message-Id: <20211111000310.1435032-10-dmatlack@google.com> Signed-off-by: Paolo Bonzini

KVM: selftests: Move per-VM GPA into perf_test_args

2021-11-16T12:43:26Z

Move the per-VM GPA into perf_test_args instead of storing it as a separate global variable. It's not obvious that guest_test_phys_mem holds a GPA, nor that it's connected/coupled with per_vcpu->gpa. No functional change intended. Signed-off-by: Sean Christopherson Reviewed-by: Ben Gardon Signed-off-by: David Matlack Message-Id: <20211111000310.1435032-9-dmatlack@google.com> Signed-off-by: Paolo Bonzini

KVM: selftests: Capture per-vCPU GPA in perf_test_vcpu_args

2021-11-16T12:43:26Z

Capture the per-vCPU GPA in perf_test_vcpu_args so that tests can get the GPA without having to calculate the GPA on their own. No functional change intended. Signed-off-by: Sean Christopherson Reviewed-by: Ben Gardon Signed-off-by: David Matlack Message-Id: <20211111000310.1435032-7-dmatlack@google.com> Signed-off-by: Paolo Bonzini

KVM: selftests: Support multiple slots in dirty_log_perf_test

2021-08-06T11:53:01Z

Introduce a new option to dirty_log_perf_test: -x number_of_slots. This causes the test to attempt to split the region of memory into the given number of slots. If the region cannot be evenly divided, the test will fail. This allows testing with more than one slot and therefore measure how performance scales with the number of memslots. Signed-off-by: David Matlack Message-Id: <20210804222844.1419481-8-dmatlack@google.com> Signed-off-by: Paolo Bonzini

KVM: selftests: Add backing src parameter to dirty_log_perf_test

2021-02-04T10:27:19Z

Add a parameter to control the backing memory type for dirty_log_perf_test so that the test can be run with hugepages. To: linux-kselftest@vger.kernel.org CC: Peter Xu CC: Andrew Jones CC: Thomas Huth Signed-off-by: Ben Gardon Message-Id: <20210202185734.1680553-28-bgardon@google.com> Signed-off-by: Paolo Bonzini

KVM: selftests: Add option to overlap vCPU memory access

2021-02-04T10:27:19Z

Add an option to overlap the ranges of memory each vCPU accesses instead of partitioning them. This option will increase the probability of multiple vCPUs faulting on the same page at the same time, and causing interesting races, if there are bugs in the page fault handler or elsewhere in the kernel. Reviewed-by: Jacob Xu Reviewed-by: Makarand Sonare Signed-off-by: Ben Gardon Message-Id: <20210112214253.463999-6-bgardon@google.com> Signed-off-by: Paolo Bonzini