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SUSE:SLE-12-SP4:Update
xen.481
54b3dd08-x86emul-tighten-CLFLUSH-emulation.patch
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File 54b3dd08-x86emul-tighten-CLFLUSH-emulation.patch of Package xen.481
# Commit 9d03db6b81d1880bf3aa4fc83a60346bf02be251 # Date 2015-01-12 15:41:12 +0100 # Author Jan Beulich <jbeulich@suse.com> # Committer Jan Beulich <jbeulich@suse.com> x86emul: tighten CLFLUSH emulation While for us it's not as bad as it was for Linux, their commit 13e457e0ee ("KVM: x86: Emulator does not decode clflush well", by Nadav Amit <namit@cs.technion.ac.il>) nevertheless points out two shortcomings in our code: opcode 0F AE /7 is clflush only when it uses a memory mode (otherwise it's SFENCE) and when there's no REP prefix (an operand size prefix is fine, as that's CLFLUSHOPT). Signed-off-by: Jan Beulich <jbeulich@suse.com> Acked-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 @@ -4282,7 +4282,9 @@ x86_emulate( case 0xae: /* Grp15 */ switch ( modrm_reg & 7 ) { - case 7: /* clflush */ + case 7: /* clflush{,opt} */ + fail_if(modrm_mod == 3); + fail_if(rep_prefix()); fail_if(ops->wbinvd == NULL); if ( (rc = ops->wbinvd(ctxt)) != 0 ) goto done;
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