KVM: selftests: Add helpers to convert guest memory b/w private and shared

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Add helpers to convert memory between private and shared via KVM's
memory attributes, as well as helpers to free/allocate guest_memfd memory
via fallocate().  Userspace, i.e. tests, is NOT required to do fallocate()
when converting memory, as the attributes are the single source of truth.
Provide allocate() helpers so that tests can mimic a userspace that frees
private memory on conversion, e.g. to prioritize memory usage over
performance.

Signed-off-by: Vishal Annapurve <vannapurve@google.com>
Co-developed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20231027182217.3615211-28-seanjc@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Vishal Annapurve 2023-10-27 11:22:09 -07:00 • committed by Paolo Bonzini

parent bb2968ad6c

commit f7fa67495d

2 changed files with 76 additions and 0 deletions

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48

tools/testing/selftests/kvm/include/kvm_util_base.h

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28

tools/testing/selftests/kvm/lib/kvm_util.c

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