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authorVipin Sharma <vipinsh@google.com>2022-09-21 23:24:51 -0700
committerSean Christopherson <seanjc@google.com>2022-09-28 12:47:19 -0700
commitdfb45db43e9f6283a79230c8ea9cb589f14791b0 (patch)
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parentbf3f11581893494a5fb01eb87b99627edc2a85ff (diff)
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KVM: selftests: Load RAX with -EFAULT before Hyper-V hypercall
Load RAX with -EFAULT prior to making a Hyper-V hypercall so that tests can't get false negatives due to the compiler coincidentally loading the "right" value into RAX, i.e. to ensure that _KVM_ and not the compiler is correctly clearing RAX on a successful hypercall. Note, initializing *hv_status (in C code) to -EFAULT is not sufficient to avoid false negatives, as the compiler can still "clobber" RAX and thus load garbage into *hv_status if the hypercall faults (or if KVM doesn't set RAX). Suggested-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Vipin Sharma <vipinsh@google.com> Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com> Link: https://lore.kernel.org/r/20220922062451.2927010-1-vipinsh@google.com [sean: move to separate patch, massage changelog] Signed-off-by: Sean Christopherson <seanjc@google.com>
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