@@ -829,6 +829,11 @@ int xc_cpu_policy_legacy_topology(xc_interface *xch, xc_cpu_policy_t *policy,
int xc_cpu_policy_apply_cpuid(xc_interface *xch, xc_cpu_policy_t *policy,
const struct xc_xend_cpuid *cpuid, bool hvm);
+/* Apply a featureset to the policy. */
+int xc_cpu_policy_apply_featureset(xc_interface *xch, xc_cpu_policy_t *policy,
+ const uint32_t *featureset,
+ unsigned int nr_features);
+
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);
@@ -443,46 +443,15 @@ int xc_cpuid_apply_policy(xc_interface *xch, uint32_t domid, bool restore,
if ( featureset )
{
- uint32_t disabled_features[FEATURESET_NR_ENTRIES],
- feat[FEATURESET_NR_ENTRIES] = {};
- static const uint32_t deep_features[] = INIT_DEEP_FEATURES;
- unsigned int i, b;
-
- /*
- * The user supplied featureset may be shorter or longer than
- * FEATURESET_NR_ENTRIES. Shorter is fine, and we will zero-extend.
- * Longer is fine, so long as it only padded with zeros.
- */
- unsigned int user_len = min(FEATURESET_NR_ENTRIES + 0u, nr_features);
-
- /* Check for truncated set bits. */
- rc = -EOPNOTSUPP;
- for ( i = user_len; i < nr_features; ++i )
- if ( featureset[i] != 0 )
- goto out;
-
- memcpy(feat, featureset, sizeof(*featureset) * user_len);
-
- /* Disable deep dependencies of disabled features. */
- for ( i = 0; i < ARRAY_SIZE(disabled_features); ++i )
- disabled_features[i] = ~feat[i] & deep_features[i];
-
- for ( b = 0; b < sizeof(disabled_features) * CHAR_BIT; ++b )
+ policy.cpuid = *p;
+ rc = xc_cpu_policy_apply_featureset(xch, &policy, featureset,
+ nr_features);
+ if ( rc )
{
- const uint32_t *dfs;
-
- if ( !test_bit(b, disabled_features) ||
- !(dfs = x86_cpuid_lookup_deep_deps(b)) )
- continue;
-
- for ( i = 0; i < ARRAY_SIZE(disabled_features); ++i )
- {
- feat[i] &= ~dfs[i];
- disabled_features[i] &= ~dfs[i];
- }
+ ERROR("Failed to apply featureset to policy");
+ goto out;
}
-
- cpuid_featureset_to_policy(feat, p);
+ *p = policy.cpuid;
}
else
{
@@ -918,3 +887,53 @@ int xc_cpu_policy_legacy_topology(xc_interface *xch, xc_cpu_policy_t *policy,
return 0;
}
+
+int xc_cpu_policy_apply_featureset(xc_interface *xch, xc_cpu_policy_t *policy,
+ const uint32_t *featureset,
+ unsigned int nr_features)
+{
+ uint32_t disabled_features[FEATURESET_NR_ENTRIES],
+ feat[FEATURESET_NR_ENTRIES] = {};
+ static const uint32_t deep_features[] = INIT_DEEP_FEATURES;
+ unsigned int i, b;
+
+ /*
+ * The user supplied featureset may be shorter or longer than
+ * FEATURESET_NR_ENTRIES. Shorter is fine, and we will zero-extend.
+ * Longer is fine, so long as it only padded with zeros.
+ */
+ unsigned int user_len = min(FEATURESET_NR_ENTRIES + 0u, nr_features);
+
+ /* Check for truncated set bits. */
+ for ( i = user_len; i < nr_features; ++i )
+ if ( featureset[i] != 0 )
+ {
+ errno = EOPNOTSUPP;
+ return -1;
+ }
+
+ memcpy(feat, featureset, sizeof(*featureset) * user_len);
+
+ /* Disable deep dependencies of disabled features. */
+ for ( i = 0; i < ARRAY_SIZE(disabled_features); ++i )
+ disabled_features[i] = ~feat[i] & deep_features[i];
+
+ for ( b = 0; b < sizeof(disabled_features) * CHAR_BIT; ++b )
+ {
+ const uint32_t *dfs;
+
+ if ( !test_bit(b, disabled_features) ||
+ !(dfs = x86_cpuid_lookup_deep_deps(b)) )
+ continue;
+
+ for ( i = 0; i < ARRAY_SIZE(disabled_features); ++i )
+ {
+ feat[i] &= ~dfs[i];
+ disabled_features[i] &= ~dfs[i];
+ }
+ }
+
+ cpuid_featureset_to_policy(feat, &policy->cpuid);
+
+ return 0;
+}
Pull out the code from xc_cpuid_apply_policy that applies a featureset to a cpu policy and place it on it's own standalone function that's part of the public interface. No functional change intended. Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> --- tools/include/xenguest.h | 5 ++ tools/libs/guest/xg_cpuid_x86.c | 95 ++++++++++++++++++++------------- 2 files changed, 62 insertions(+), 38 deletions(-)