[Xen-devel] [PATCH v4 22/26] tools/libxc: Expose the automatically generated cpu featuremask information

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
CC: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>

New in v2
---
 tools/libxc/Makefile          |  9 ++++++
 tools/libxc/include/xenctrl.h | 14 ++++++++
 tools/libxc/xc_cpuid_x86.c    | 75 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 98 insertions(+)

diff --git a/tools/libxc/Makefile b/tools/libxc/Makefile
index 608404f..ef02c9d 100644
--- a/tools/libxc/Makefile
+++ b/tools/libxc/Makefile
@@ -145,6 +145,15 @@ $(eval $(genpath-target))
 
 xc_private.h: _paths.h
 
+ifeq ($(CONFIG_X86),y)
+
+_xc_cpuid_autogen.h: $(XEN_ROOT)/xen/include/public/arch-x86/cpufeatureset.h 
$(XEN_ROOT)/xen/tools/gen-cpuid.py
+       $(PYTHON) $(XEN_ROOT)/xen/tools/gen-cpuid.py -i $^ -o $@.new
+       $(call move-if-changed,$@.new,$@)
+
+build: _xc_cpuid_autogen.h
+endif
+
 $(CTRL_LIB_OBJS) $(GUEST_LIB_OBJS) \
 $(CTRL_PIC_OBJS) $(GUEST_PIC_OBJS): xc_private.h
 
diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index c136aa8..66acbd1 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -2533,6 +2533,20 @@ int xc_psr_cat_get_l3_info(xc_interface *xch, uint32_t 
socket,
 int xc_get_cpu_levelling_caps(xc_interface *xch, uint32_t *caps);
 int xc_get_cpu_featureset(xc_interface *xch, uint32_t index,
                           uint32_t *nr_features, uint32_t *featureset);
+
+uint32_t xc_get_cpu_featureset_size(void);
+
+enum xc_static_cpu_featuremask {
+    XC_FEATUREMASK_KNOWN,
+    XC_FEATUREMASK_SPECIAL,
+    XC_FEATUREMASK_PV,
+    XC_FEATUREMASK_HVM_SHADOW,
+    XC_FEATUREMASK_HVM_HAP,
+    XC_FEATUREMASK_DEEP_FEATURES,
+};
+const uint32_t *xc_get_static_cpu_featuremask(enum xc_static_cpu_featuremask);
+const uint32_t *xc_get_feature_deep_deps(uint32_t feature);
+
 #endif
 
 /* Compat shims */
diff --git a/tools/libxc/xc_cpuid_x86.c b/tools/libxc/xc_cpuid_x86.c
index d3674db..0cffb36 100644
--- a/tools/libxc/xc_cpuid_x86.c
+++ b/tools/libxc/xc_cpuid_x86.c
@@ -28,6 +28,7 @@ enum {
 #define XEN_CPUFEATURE(name, value) X86_FEATURE_##name = value,
 #include <xen/arch-x86/cpufeatureset.h>
 };
+#include "_xc_cpuid_autogen.h"
 
 #define bitmaskof(idx)      (1u << ((idx) & 31))
 #define clear_bit(idx, dst) ((dst) &= ~bitmaskof(idx))
@@ -78,6 +79,80 @@ int xc_get_cpu_featureset(xc_interface *xch, uint32_t index,
     return ret;
 }
 
+uint32_t xc_get_cpu_featureset_size(void)
+{
+    return FEATURESET_NR_ENTRIES;
+}
+
+const uint32_t *xc_get_static_cpu_featuremask(
+    enum xc_static_cpu_featuremask mask)
+{
+    const static uint32_t known[FEATURESET_NR_ENTRIES] = INIT_KNOWN_FEATURES,
+        special[FEATURESET_NR_ENTRIES] = INIT_SPECIAL_FEATURES,
+        pv[FEATURESET_NR_ENTRIES] = INIT_PV_FEATURES,
+        hvm_shadow[FEATURESET_NR_ENTRIES] = INIT_HVM_SHADOW_FEATURES,
+        hvm_hap[FEATURESET_NR_ENTRIES] = INIT_HVM_HAP_FEATURES,
+        deep_features[FEATURESET_NR_ENTRIES] = INIT_DEEP_FEATURES;
+
+    XC_BUILD_BUG_ON(ARRAY_SIZE(known) != FEATURESET_NR_ENTRIES);
+    XC_BUILD_BUG_ON(ARRAY_SIZE(special) != FEATURESET_NR_ENTRIES);
+    XC_BUILD_BUG_ON(ARRAY_SIZE(pv) != FEATURESET_NR_ENTRIES);
+    XC_BUILD_BUG_ON(ARRAY_SIZE(hvm_shadow) != FEATURESET_NR_ENTRIES);
+    XC_BUILD_BUG_ON(ARRAY_SIZE(hvm_hap) != FEATURESET_NR_ENTRIES);
+    XC_BUILD_BUG_ON(ARRAY_SIZE(deep_features) != FEATURESET_NR_ENTRIES);
+
+    switch ( mask )
+    {
+    case XC_FEATUREMASK_KNOWN:
+        return known;
+
+    case XC_FEATUREMASK_SPECIAL:
+        return special;
+
+    case XC_FEATUREMASK_PV:
+        return pv;
+
+    case XC_FEATUREMASK_HVM_SHADOW:
+        return hvm_shadow;
+
+    case XC_FEATUREMASK_HVM_HAP:
+        return hvm_hap;
+
+    case XC_FEATUREMASK_DEEP_FEATURES:
+        return deep_features;
+
+    default:
+        return NULL;
+    }
+}
+
+const uint32_t *xc_get_feature_deep_deps(uint32_t feature)
+{
+    static const struct {
+        uint32_t feature;
+        uint32_t fs[FEATURESET_NR_ENTRIES];
+    } deep_deps[] = INIT_DEEP_DEPS;
+
+    unsigned int start = 0, end = ARRAY_SIZE(deep_deps);
+
+    XC_BUILD_BUG_ON(ARRAY_SIZE(deep_deps) != NR_DEEP_DEPS);
+
+    /* deep_deps[] is sorted.  Perform a binary search. */
+    while ( start < end )
+    {
+        unsigned int mid = start + ((end - start) / 2);
+
+        if ( deep_deps[mid].feature > feature )
+            end = mid;
+        else if ( deep_deps[mid].feature < feature )
+            start = mid + 1;
+        else
+            return deep_deps[mid].fs;
+    }
+
+    return NULL;
+}
+
 struct cpuid_domain_info
 {
     enum
-- 
2.1.4


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