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| author |   Sean Christopherson <seanjc@google.com> | 2021-12-07 22:09:26 +0000 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2022-02-10 13:50:36 -0500 |
| commit | 413af6601f7613c07d8c36b57e184d7841ace43a (patch) | |
| tree | a27a6aa6ca34038283ef8532b3def152cb9c8f15 /include/asm-generic/hyperv-tlfs.h | |
| parent | KVM: x86: Reject fixeds-size Hyper-V hypercalls with non-zero "var_cnt" (diff) | |
| download | wireguard-linux-413af6601f7613c07d8c36b57e184d7841ace43a.tar.xz wireguard-linux-413af6601f7613c07d8c36b57e184d7841ace43a.zip | |
KVM: x86: Add checks for reserved-to-zero Hyper-V hypercall fields
Add checks for the three fields in Hyper-V's hypercall params that must
be zero. Per the TLFS, HV_STATUS_INVALID_HYPERCALL_INPUT is returned if
"A reserved bit in the specified hypercall input value is non-zero."
Note, some versions of the TLFS have an off-by-one bug for the last
reserved field, and define it as being bits 64:60. See
https://github.com/MicrosoftDocs/Virtualization-Documentation/pull/1682.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20211207220926.718794-9-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include/asm-generic/hyperv-tlfs.h')
| -rw-r--r-- | include/asm-generic/hyperv-tlfs.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h index b8babc4d3fe4..fdce7a4cfc6f 100644 --- a/include/asm-generic/hyperv-tlfs.h +++ b/include/asm-generic/hyperv-tlfs.h @@ -184,11 +184,17 @@ enum HV_GENERIC_SET_FORMAT { #define HV_HYPERCALL_FAST_BIT BIT(16) #define HV_HYPERCALL_VARHEAD_OFFSET 17 #define HV_HYPERCALL_VARHEAD_MASK GENMASK_ULL(26, 17) +#define HV_HYPERCALL_RSVD0_MASK GENMASK_ULL(31, 27) #define HV_HYPERCALL_REP_COMP_OFFSET 32 #define HV_HYPERCALL_REP_COMP_1 BIT_ULL(32) #define HV_HYPERCALL_REP_COMP_MASK GENMASK_ULL(43, 32) +#define HV_HYPERCALL_RSVD1_MASK GENMASK_ULL(47, 44) #define HV_HYPERCALL_REP_START_OFFSET 48 #define HV_HYPERCALL_REP_START_MASK GENMASK_ULL(59, 48) +#define HV_HYPERCALL_RSVD2_MASK GENMASK_ULL(63, 60) +#define HV_HYPERCALL_RSVD_MASK (HV_HYPERCALL_RSVD0_MASK | \ + HV_HYPERCALL_RSVD1_MASK | \ + HV_HYPERCALL_RSVD2_MASK) /* hypercall status code */ #define HV_STATUS_SUCCESS 0 |