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x86: hide MWAITX from PV domains
Since MWAIT is hidden too. (Linux starting with 4.3 is making use of
that feature, and is checking for it without looking at the MWAIT one.)
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
master commit: 941cd44324
master date: 2015-10-13 17:17:52 +0200
This commit is contained in:
Jan Beulich committed
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@@ -873,6 +873,7 @@ void pv_cpuid(struct cpu_user_regs *regs)
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__clear_bit(X86_FEATURE_LWP % 32, &c);
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__clear_bit(X86_FEATURE_NODEID_MSR % 32, &c);
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__clear_bit(X86_FEATURE_TOPOEXT % 32, &c);
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__clear_bit(X86_FEATURE_MWAITX % 32, &c);
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break;
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case 0x00000005: /* MONITOR/MWAIT */
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@@ -137,6 +137,7 @@
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#define X86_FEATURE_NODEID_MSR (6*32+19) /* NodeId MSR */
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#define X86_FEATURE_TBM (6*32+21) /* trailing bit manipulations */
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#define X86_FEATURE_TOPOEXT (6*32+22) /* topology extensions CPUID leafs */
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#define X86_FEATURE_MWAITX (6*32+29) /* MWAIT extension (MONITORX/MWAITX) */
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/* Intel-defined CPU features, CPUID level 0x00000007:0 (ebx), word 7 */
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#define X86_FEATURE_FSGSBASE (7*32+ 0) /* {RD,WR}{FS,GS}BASE instructions */
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