x86/insn-eval: Incorporate segment base in linear address computation

insn_get_addr_ref() returns the effective address as defined by the
section 3.7.5.1 Vol 1 of the Intel 64 and IA-32 Architectures Software
Developer's Manual. In order to compute the linear address, we must add
to the effective address the segment base address as set in the segment
descriptor. The segment descriptor to use depends on the register used as
operand and segment override prefixes, if any.

In most cases, the segment base address will be 0 if the USER_DS/USER32_DS
segment is used or if segmentation is not used. However, the base address
is not necessarily zero if a user programs defines its own segments. This
is possible by using a local descriptor table.

Since the effective address is a signed quantity, the unsigned segment
base address is saved in a separate variable and added to the final,
unsigned, effective address.

Signed-off-by: Ricardo Neri <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Borislav Petkov <[email protected]>
Cc: "Michael S. Tsirkin" <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: [email protected]
Cc: Adrian Hunter <[email protected]>
Cc: Paul Gortmaker <[email protected]>
Cc: Huang Rui <[email protected]>
Cc: Qiaowei Ren <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: "Ravi V. Shankar" <[email protected]>
Cc: Chris Metcalf <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Chen Yucong <[email protected]>
Cc: Adam Buchbinder <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Lorenzo Stoakes <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Thomas Garnier <[email protected]>
Link: https://lkml.kernel.org/r/1509135945-13762-19-git-send-email-ricardo.neri-calderon@linux.intel.com

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