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Intel SDM vol. 3, 5.3: The processor causes a general-protection exception (or, if the segment is SS, a stack-fault exception) any time an attempt is made to access the following addresses in a segment: - A byte at an offset greater than the effective limit - A word at an offset greater than the (effective-limit – 1) - A doubleword at an offset greater than the (effective-limit – 3) - A quadword at an offset greater than the (effective-limit – 7) Therefore, the generic limit checking error condition must be exn = (off > limit + 1 - access_len) = (off + access_len - 1 > limit) but not exn = (off + access_len > limit) as for now. Also avoid integer overflow of `off` at 32-bit KVM by casting it to u64. Note: access length is currently sizeof(u64) which is incorrect. This will be fixed in the subsequent patch. Signed-off-by: Eugene Korenevsky <ekorenevsky@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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