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KVM: selftests: Add a testcase to verify GUEST_MEMFD and READONLY are…
… exclusive Extend set_memory_region_test's invalid flags subtest to verify that GUEST_MEMFD is incompatible with READONLY. GUEST_MEMFD doesn't currently support writes from userspace and KVM doesn't support emulated MMIO on private accesses, and so KVM is supposed to reject the GUEST_MEMFD+READONLY in order to avoid configuration that KVM can't support. Link: https://lore.kernel.org/r/20240222190612.2942589-6-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
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