diff options
author | Sean Christopherson <seanjc@google.com> | 2021-12-08 01:09:25 +0300 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-02-10 21:50:35 +0300 |
commit | 40421f38f63764cd41b01c17e2a1fbbe08a1515a (patch) | |
tree | f3e726699c8a335d1a4d4702169c2bb70d7fc528 /include/asm-generic | |
parent | 9c52f6b3d8c09df75b72dab9a0e6eb2b70435ae1 (diff) | |
download | linux-40421f38f63764cd41b01c17e2a1fbbe08a1515a.tar.xz |
KVM: x86: Reject fixeds-size Hyper-V hypercalls with non-zero "var_cnt"
Reject Hyper-V hypercalls if the guest specifies a non-zero variable size
header (var_cnt in KVM) for a hypercall that has a fixed header size.
Per the TLFS:
It is illegal to specify a non-zero variable header size for a
hypercall that is not explicitly documented as accepting variable sized
input headers. In such a case the hypercall will result in a return
code of HV_STATUS_INVALID_HYPERCALL_INPUT.
Note, at least some of the various DEBUG commands likely aren't allowed
to use variable size headers, but the TLFS documentation doesn't clearly
state what is/isn't allowed. Omit them for now to avoid unnecessary
breakage.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20211207220926.718794-8-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include/asm-generic')
0 files changed, 0 insertions, 0 deletions