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KVM: selftests: Sync perf_test_args to guest during VM creation

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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 <seanjc@google.com>
Signed-off-by: David Matlack <dmatlack@google.com>
Reviewed-by: Ben Gardon <bgardon@google.com>
Message-Id: <20211111000310.1435032-13-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson
2021-11-11 00:03:10 +00:00
committed by Paolo Bonzini
parent cf1d59300a
commit 13bbc70329
6 changed files with 16 additions and 15 deletions
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12
tools/testing/selftests/kvm/lib/perf_test_util.c
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@@ -94,6 +94,9 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int vcpus,
pr_info("Testing guest mode: %s\n", vm_guest_mode_string(mode));
/* By default vCPUs will write to memory. */
pta->wr_fract = 1;
/*
* Snapshot the non-huge page size. This is used by the guest code to
* access/dirty pages at the logging granularity.
@@ -157,6 +160,9 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int vcpus,
ucall_init(vm, NULL);
/* Export the shared variables to the guest. */
sync_global_to_guest(vm, perf_test_args);
return vm;
}
@@ -165,3 +171,9 @@ void perf_test_destroy_vm(struct kvm_vm *vm)
ucall_uninit(vm);
kvm_vm_free(vm);
}
void perf_test_set_wr_fract(struct kvm_vm *vm, int wr_fract)
{
perf_test_args.wr_fract = wr_fract;
sync_global_to_guest(vm, perf_test_args);
}