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KVM: selftests: Create VM with adjusted number of guest pages for perf tests

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Use the already computed guest_num_pages when creating the so called
extra VM pages for a perf test, and add a comment explaining why the
pages are allocated as extra pages.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Ben Gardon <bgardon@google.com>
Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <20211111000310.1435032-11-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-11-11 00:03:08 +00:00 committed by Paolo Bonzini
parent a5ac0fd1b9
commit f5e8fe2a92
1 changed files with 6 additions and 2 deletions
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8
tools/testing/selftests/kvm/lib/perf_test_util.c
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@ -77,9 +77,13 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int vcpus,
"Guest memory cannot be evenly divided into %d slots.",
slots);
/*
* Pass guest_num_pages to populate the page tables for test memory.
* The memory is also added to memslot 0, but that's a benign side
* effect as KVM allows aliasing HVAs in meslots.
*/
vm = vm_create_with_vcpus(mode, vcpus, DEFAULT_GUEST_PHY_PAGES,
(vcpus * vcpu_memory_bytes) / pta->guest_page_size,
0, guest_code, NULL);
guest_num_pages, 0, guest_code, NULL);
pta->vm = vm;