[Xen-devel] [PATCH 2/6] x86/feature: Generalise synth and introduce a bug word

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Future changes are going to want to use cpu_bug_* in a mannor similar to
Linux.  Introduce one bug word, and generalise the calculation of
NCAPINTS.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/include/asm-x86/cpufeatures.h | 57 ++++++++++++++++++++++-----------------
 1 file changed, 33 insertions(+), 24 deletions(-)

diff --git a/xen/include/asm-x86/cpufeatures.h 
b/xen/include/asm-x86/cpufeatures.h
index 0c06274..ba468ea 100644
--- a/xen/include/asm-x86/cpufeatures.h
+++ b/xen/include/asm-x86/cpufeatures.h
@@ -4,30 +4,39 @@
 
 #include <xen/lib/x86/cpuid-autogen.h>
 
+/* Number of capability words covered by the featureset words. */
 #define FSCAPINTS FEATURESET_NR_ENTRIES
 
-#define NCAPINTS (FSCAPINTS + 1) /* N 32-bit words worth of info */
+/* Synthetic words follow the featureset words. */
+#define X86_NR_SYNTH 1
+#define X86_SYNTH(x) (FSCAPINTS * 32 + (x))
 
-/* Other features, Xen-defined mapping. */
-/* This range is used for feature bits which conflict or are synthesized */
-XEN_CPUFEATURE(CONSTANT_TSC,    (FSCAPINTS+0)*32+ 0) /* TSC ticks at a 
constant rate */
-XEN_CPUFEATURE(NONSTOP_TSC,     (FSCAPINTS+0)*32+ 1) /* TSC does not stop in C 
states */
-XEN_CPUFEATURE(ARAT,            (FSCAPINTS+0)*32+ 2) /* Always running APIC 
timer */
-XEN_CPUFEATURE(ARCH_PERFMON,    (FSCAPINTS+0)*32+ 3) /* Intel Architectural 
PerfMon */
-XEN_CPUFEATURE(TSC_RELIABLE,    (FSCAPINTS+0)*32+ 4) /* TSC is known to be 
reliable */
-XEN_CPUFEATURE(XTOPOLOGY,       (FSCAPINTS+0)*32+ 5) /* cpu topology enum 
extensions */
-XEN_CPUFEATURE(CPUID_FAULTING,  (FSCAPINTS+0)*32+ 6) /* cpuid faulting */
-XEN_CPUFEATURE(CLFLUSH_MONITOR, (FSCAPINTS+0)*32+ 7) /* clflush reqd with 
monitor */
-XEN_CPUFEATURE(APERFMPERF,      (FSCAPINTS+0)*32+ 8) /* APERFMPERF */
-XEN_CPUFEATURE(MFENCE_RDTSC,    (FSCAPINTS+0)*32+ 9) /* MFENCE synchronizes 
RDTSC */
-XEN_CPUFEATURE(XEN_SMEP,        (FSCAPINTS+0)*32+10) /* SMEP gets used by Xen 
itself */
-XEN_CPUFEATURE(XEN_SMAP,        (FSCAPINTS+0)*32+11) /* SMAP gets used by Xen 
itself */
-XEN_CPUFEATURE(LFENCE_DISPATCH, (FSCAPINTS+0)*32+12) /* lfence set as Dispatch 
Serialising */
-XEN_CPUFEATURE(IND_THUNK_LFENCE,(FSCAPINTS+0)*32+13) /* Use IND_THUNK_LFENCE */
-XEN_CPUFEATURE(IND_THUNK_JMP,   (FSCAPINTS+0)*32+14) /* Use IND_THUNK_JMP */
-XEN_CPUFEATURE(SC_MSR_PV,       (FSCAPINTS+0)*32+16) /* MSR_SPEC_CTRL used by 
Xen for PV */
-XEN_CPUFEATURE(SC_MSR_HVM,      (FSCAPINTS+0)*32+17) /* MSR_SPEC_CTRL used by 
Xen for HVM */
-XEN_CPUFEATURE(SC_RSB_PV,       (FSCAPINTS+0)*32+18) /* RSB overwrite needed 
for PV */
-XEN_CPUFEATURE(SC_RSB_HVM,      (FSCAPINTS+0)*32+19) /* RSB overwrite needed 
for HVM */
-XEN_CPUFEATURE(SC_MSR_IDLE,     (FSCAPINTS+0)*32+21) /* (SC_MSR_PV || 
SC_MSR_HVM) && default_xen_spec_ctrl */
-XEN_CPUFEATURE(XEN_LBR,         (FSCAPINTS+0)*32+22) /* Xen uses 
MSR_DEBUGCTL.LBR */
+/* Synthetic features */
+XEN_CPUFEATURE(CONSTANT_TSC,      X86_SYNTH( 0)) /* TSC ticks at a constant 
rate */
+XEN_CPUFEATURE(NONSTOP_TSC,       X86_SYNTH( 1)) /* TSC does not stop in C 
states */
+XEN_CPUFEATURE(ARAT,              X86_SYNTH( 2)) /* Always running APIC timer 
*/
+XEN_CPUFEATURE(ARCH_PERFMON,      X86_SYNTH( 3)) /* Intel Architectural 
PerfMon */
+XEN_CPUFEATURE(TSC_RELIABLE,      X86_SYNTH( 4)) /* TSC is known to be 
reliable */
+XEN_CPUFEATURE(XTOPOLOGY,         X86_SYNTH( 5)) /* cpu topology enum 
extensions */
+XEN_CPUFEATURE(CPUID_FAULTING,    X86_SYNTH( 6)) /* cpuid faulting */
+XEN_CPUFEATURE(CLFLUSH_MONITOR,   X86_SYNTH( 7)) /* clflush reqd with monitor 
*/
+XEN_CPUFEATURE(APERFMPERF,        X86_SYNTH( 8)) /* APERFMPERF */
+XEN_CPUFEATURE(MFENCE_RDTSC,      X86_SYNTH( 9)) /* MFENCE synchronizes RDTSC 
*/
+XEN_CPUFEATURE(XEN_SMEP,          X86_SYNTH(10)) /* SMEP gets used by Xen 
itself */
+XEN_CPUFEATURE(XEN_SMAP,          X86_SYNTH(11)) /* SMAP gets used by Xen 
itself */
+XEN_CPUFEATURE(LFENCE_DISPATCH,   X86_SYNTH(12)) /* lfence set as Dispatch 
Serialising */
+XEN_CPUFEATURE(IND_THUNK_LFENCE,  X86_SYNTH(13)) /* Use IND_THUNK_LFENCE */
+XEN_CPUFEATURE(IND_THUNK_JMP,     X86_SYNTH(14)) /* Use IND_THUNK_JMP */
+XEN_CPUFEATURE(SC_MSR_PV,         X86_SYNTH(16)) /* MSR_SPEC_CTRL used by Xen 
for PV */
+XEN_CPUFEATURE(SC_MSR_HVM,        X86_SYNTH(17)) /* MSR_SPEC_CTRL used by Xen 
for HVM */
+XEN_CPUFEATURE(SC_RSB_PV,         X86_SYNTH(18)) /* RSB overwrite needed for 
PV */
+XEN_CPUFEATURE(SC_RSB_HVM,        X86_SYNTH(19)) /* RSB overwrite needed for 
HVM */
+XEN_CPUFEATURE(SC_MSR_IDLE,       X86_SYNTH(21)) /* (SC_MSR_PV || SC_MSR_HVM) 
&& default_xen_spec_ctrl */
+XEN_CPUFEATURE(XEN_LBR,           X86_SYNTH(22)) /* Xen uses MSR_DEBUGCTL.LBR 
*/
+
+/* Bug words follow the synthetic words. */
+#define X86_NR_BUG 1
+#define X86_BUG(x) ((FSCAPINTS + X86_NR_SYNTH) * 32 + (x))
+
+/* Total number of capability words, inc synth and bug words. */
+#define NCAPINTS (FSCAPINTS + X86_NR_SYNTH + X86_NR_BUG) /* N 32-bit words 
worth of info */
-- 
2.1.4


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