KVM: SEV: Return INVALID_INPUT, not MISSING_INPUT, for bad GUEST_REQUEST input(s)

Return INVALID_INPUT, not MISSING_INPUT, if the guest provides an unaligned
address for a GUEST_REQUEST, and/or attempts to use the same page for the
source and destination.  The inputs are obviously invalid, not missing.

Opportunistically move the checks out of sev_es_validate_vmgexit(), to
continue the march towards reducing the scope of the helper, and to help
guide future changes into correctly handling bad input.

Fixes: 88caf544c930 ("KVM: SEV: Provide support for SNP_GUEST_REQUEST NAE event")
Fixes: 74458e4859d8 ("KVM: SEV: Provide support for SNP_EXTENDED_GUEST_REQUEST NAE event")
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20260501202250.2115252-22-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20260529183549.1104619-22-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

0 files changed, 0 insertions, 0 deletions