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SUSE:SLE-12-SP5:Update
xen.3678
581b647a-x86emul-L-S-G-I-DT-ignore-opsz-overrid...
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File 581b647a-x86emul-L-S-G-I-DT-ignore-opsz-overrides-in-64-bit-mode.patch of Package xen.3678
# Commit 4ccb2adb96042e0d1e334c01fe260b32e6001db9 # Date 2016-11-03 17:23:22 +0100 # Author Jan Beulich <jbeulich@suse.com> # Committer Jan Beulich <jbeulich@suse.com> x86emul: {L,S}{G,I}DT ignore operand size overrides in 64-bit mode This affects not only the layout of the data (always 2+8 bytes), but also the contents (no truncation to 24 bits occurs). Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> --- a/xen/arch/x86/x86_emulate/x86_emulate.c +++ b/xen/arch/x86/x86_emulate/x86_emulate.c @@ -3986,12 +3986,17 @@ x86_emulate( x86_seg_idtr : x86_seg_gdtr, ®, ctxt)) ) goto done; - if ( op_bytes == 2 ) + if ( mode_64bit() ) + op_bytes = 8; + else if ( op_bytes == 2 ) + { reg.base &= 0xffffff; - if ( (rc = ops->write(ea.mem.seg, ea.mem.off+0, - ®.limit, 2, ctxt)) || - (rc = ops->write(ea.mem.seg, ea.mem.off+2, - ®.base, mode_64bit() ? 8 : 4, ctxt)) ) + op_bytes = 4; + } + if ( (rc = ops->write(ea.mem.seg, ea.mem.off, ®.limit, + 2, ctxt)) != X86EMUL_OKAY || + (rc = ops->write(ea.mem.seg, ea.mem.off + 2, ®.base, + op_bytes, ctxt)) != X86EMUL_OKAY ) goto done; break; case 2: /* lgdt */ @@ -4008,7 +4013,7 @@ x86_emulate( generate_exception_if(!is_canonical_address(base), EXC_GP, 0); reg.base = base; reg.limit = limit; - if ( op_bytes == 2 ) + if ( !mode_64bit() && op_bytes == 2 ) reg.base &= 0xffffff; if ( (rc = ops->write_segment((modrm_reg & 1) ? x86_seg_idtr : x86_seg_gdtr,
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