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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 20/27] x86/cpuid: Drop the temporary linear feature bitmap from struct cpuid_policy
With most uses of the *_featureset API removed, the remaining uses are only
during XEN_SYSCTL_get_cpu_featureset, init_guest_cpuid(), and
recalculate_cpuid_policy(), none of which are hot paths.
Drop the temporary infrastructure, and have the current users recreate the
linear bitmap using cpuid_policy_to_featureset(). This avoids storing
duplicated information in struct cpuid_policy.
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
---
xen/arch/x86/cpuid.c | 19 ++++++++++---------
xen/arch/x86/sysctl.c | 21 ++++++++++++---------
xen/include/asm-x86/cpuid.h | 9 ---------
3 files changed, 22 insertions(+), 27 deletions(-)
diff --git a/xen/arch/x86/cpuid.c b/xen/arch/x86/cpuid.c
index 86f598f..a261843 100644
--- a/xen/arch/x86/cpuid.c
+++ b/xen/arch/x86/cpuid.c
@@ -126,24 +126,23 @@ static void __init calculate_raw_policy(void)
for ( i = 1; i < min(ARRAY_SIZE(p->extd.raw),
p->extd.max_leaf + 1 - 0x80000000ul); ++i )
cpuid_leaf(0x80000000 + i, &p->extd.raw[i]);
-
- cpuid_policy_to_featureset(p, p->fs);
}
static void __init calculate_host_policy(void)
{
struct cpuid_policy *p = &host_policy;
- memcpy(p->fs, boot_cpu_data.x86_capability, sizeof(p->fs));
-
- cpuid_featureset_to_policy(host_featureset, p);
+ cpuid_featureset_to_policy(boot_cpu_data.x86_capability, p);
}
static void __init calculate_pv_max_policy(void)
{
struct cpuid_policy *p = &pv_max_policy;
+ uint32_t pv_featureset[FSCAPINTS], host_featureset[FSCAPINTS];
unsigned int i;
+ cpuid_policy_to_featureset(&host_policy, host_featureset);
+
for ( i = 0; i < FSCAPINTS; ++i )
pv_featureset[i] = host_featureset[i] & pv_featuremask[i];
@@ -165,12 +164,15 @@ static void __init calculate_pv_max_policy(void)
static void __init calculate_hvm_max_policy(void)
{
struct cpuid_policy *p = &hvm_max_policy;
+ uint32_t hvm_featureset[FSCAPINTS], host_featureset[FSCAPINTS];
unsigned int i;
const uint32_t *hvm_featuremask;
if ( !hvm_enabled )
return;
+ cpuid_policy_to_featureset(&host_policy, host_featureset);
+
hvm_featuremask = hvm_funcs.hap_supported ?
hvm_hap_featuremask : hvm_shadow_featuremask;
@@ -199,8 +201,7 @@ static void __init calculate_hvm_max_policy(void)
* long mode (and init_amd() has cleared it out of host capabilities), but
* HVM guests are able if running in protected mode.
*/
- if ( (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) &&
- test_bit(X86_FEATURE_SEP, raw_featureset) )
+ if ( (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) && raw_policy.basic.sep )
__set_bit(X86_FEATURE_SEP, hvm_featureset);
/*
@@ -267,7 +268,7 @@ void recalculate_cpuid_policy(struct domain *d)
unsigned int i;
cpuid_policy_to_featureset(p, fs);
- memcpy(max_fs, max->fs, sizeof(max_fs));
+ cpuid_policy_to_featureset(max, max_fs);
/* Allow a toolstack to possibly select ITSC... */
if ( cpu_has_itsc )
@@ -295,7 +296,7 @@ void recalculate_cpuid_policy(struct domain *d)
/* Fold host's FDP_EXCP_ONLY and NO_FPU_SEL into guest's view. */
fs[FEATURESET_7b0] &= ~special_features[FEATURESET_7b0];
- fs[FEATURESET_7b0] |= (host_featureset[FEATURESET_7b0] &
+ fs[FEATURESET_7b0] |= (host_policy.feat._7b0 &
special_features[FEATURESET_7b0]);
sanitise_featureset(fs);
diff --git a/xen/arch/x86/sysctl.c b/xen/arch/x86/sysctl.c
index 14e7dc7..87da541 100644
--- a/xen/arch/x86/sysctl.c
+++ b/xen/arch/x86/sysctl.c
@@ -199,13 +199,14 @@ long arch_do_sysctl(
case XEN_SYSCTL_get_cpu_featureset:
{
- static const uint32_t *const featureset_table[] = {
- [XEN_SYSCTL_cpu_featureset_raw] = raw_featureset,
- [XEN_SYSCTL_cpu_featureset_host] = host_featureset,
- [XEN_SYSCTL_cpu_featureset_pv] = pv_featureset,
- [XEN_SYSCTL_cpu_featureset_hvm] = hvm_featureset,
+ static const struct cpuid_policy *const policy_table[] = {
+ [XEN_SYSCTL_cpu_featureset_raw] = &raw_policy,
+ [XEN_SYSCTL_cpu_featureset_host] = &host_policy,
+ [XEN_SYSCTL_cpu_featureset_pv] = &pv_max_policy,
+ [XEN_SYSCTL_cpu_featureset_hvm] = &hvm_max_policy,
};
- const uint32_t *featureset = NULL;
+ const struct cpuid_policy *p = NULL;
+ uint32_t featureset[FSCAPINTS];
unsigned int nr;
/* Request for maximum number of features? */
@@ -223,13 +224,15 @@ long arch_do_sysctl(
FSCAPINTS);
/* Look up requested featureset. */
- if ( sysctl->u.cpu_featureset.index < ARRAY_SIZE(featureset_table) )
- featureset = featureset_table[sysctl->u.cpu_featureset.index];
+ if ( sysctl->u.cpu_featureset.index < ARRAY_SIZE(policy_table) )
+ p = policy_table[sysctl->u.cpu_featureset.index];
/* Bad featureset index? */
- if ( !featureset )
+ if ( !p )
ret = -EINVAL;
+ cpuid_policy_to_featureset(p, featureset);
+
/* Copy the requested featureset into place. */
if ( !ret && copy_to_guest(sysctl->u.cpu_featureset.features,
featureset, nr) )
diff --git a/xen/include/asm-x86/cpuid.h b/xen/include/asm-x86/cpuid.h
index 0371e6e..9788cac 100644
--- a/xen/include/asm-x86/cpuid.h
+++ b/xen/include/asm-x86/cpuid.h
@@ -253,9 +253,6 @@ struct cpuid_policy
};
};
} extd;
-
- /* Temporary featureset bitmap. */
- uint32_t fs[FSCAPINTS];
};
/* Fill in a featureset bitmap from a CPUID policy. */
@@ -293,12 +290,6 @@ static inline void cpuid_featureset_to_policy(
extern struct cpuid_policy raw_policy, host_policy, pv_max_policy,
hvm_max_policy;
-/* Temporary compatibility defines. */
-#define raw_featureset raw_policy.fs
-#define host_featureset host_policy.fs
-#define pv_featureset pv_max_policy.fs
-#define hvm_featureset hvm_max_policy.fs
-
/* Allocate and initialise a CPUID policy suitable for the domain. */
int init_domain_cpuid_policy(struct domain *d);
--
2.1.4
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