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|
/******************************************************************************
* Arch-specific sysctl.c
*
* System management operations. For use by node control stack.
*
* Copyright (c) 2002-2006, K Fraser
*/
#include <xen/types.h>
#include <xen/lib.h>
#include <xen/mm.h>
#include <xen/nospec.h>
#include <xen/guest_access.h>
#include <xen/hypercall.h>
#include <public/sysctl.h>
#include <xen/sched.h>
#include <xen/event.h>
#include <xen/domain_page.h>
#include <asm/msr.h>
#include <xen/trace.h>
#include <xen/console.h>
#include <xen/iocap.h>
#include <asm/irq.h>
#include <asm/hvm/hvm.h>
#include <asm/processor.h>
#include <asm/setup.h>
#include <asm/smp.h>
#include <asm/numa.h>
#include <xen/nodemask.h>
#include <xen/cpu.h>
#include <xsm/xsm.h>
#include <asm/psr.h>
#include <asm/cpu-policy.h>
struct l3_cache_info {
int ret;
unsigned long size;
};
static void cf_check l3_cache_get(void *arg)
{
struct cpuid4_info info;
struct l3_cache_info *l3_info = arg;
l3_info->ret = cpuid4_cache_lookup(3, &info);
if ( !l3_info->ret )
l3_info->size = info.size / 1024; /* in KB unit */
}
static long cf_check smt_up_down_helper(void *data)
{
bool up = (bool)data;
unsigned int cpu, sibling_mask = boot_cpu_data.x86_num_siblings - 1;
int ret = 0;
opt_smt = up;
for_each_present_cpu ( cpu )
{
/* Skip primary siblings (those whose thread id is 0). */
if ( !(x86_cpu_to_apicid[cpu] & sibling_mask) )
continue;
if ( !up && core_parking_remove(cpu) )
continue;
ret = up ? cpu_up_helper(_p(cpu))
: cpu_down_helper(_p(cpu));
if ( ret && ret != -EEXIST )
break;
/*
* Ensure forward progress by only considering preemption when we have
* changed the state of one or more cpus.
*/
if ( ret != -EEXIST && general_preempt_check() )
{
/* In tasklet context - can't create a contination. */
ret = -EBUSY;
break;
}
ret = 0; /* Avoid exiting with -EEXIST in the success case. */
}
if ( !ret )
printk(XENLOG_INFO "SMT %s - online CPUs 0x%*pb\n",
up ? "enabled" : "disabled", CPUMASK_PR(&cpu_online_map));
return ret;
}
void arch_do_physinfo(struct xen_sysctl_physinfo *pi)
{
memcpy(pi->hw_cap, boot_cpu_data.x86_capability,
min(sizeof(pi->hw_cap), sizeof(boot_cpu_data.x86_capability)));
if ( hvm_enabled )
pi->capabilities |= XEN_SYSCTL_PHYSCAP_hvm;
if ( IS_ENABLED(CONFIG_PV) )
pi->capabilities |= XEN_SYSCTL_PHYSCAP_pv;
if ( hvm_hap_supported() )
pi->capabilities |= XEN_SYSCTL_PHYSCAP_hap;
if ( IS_ENABLED(CONFIG_SHADOW_PAGING) )
pi->capabilities |= XEN_SYSCTL_PHYSCAP_shadow;
}
long arch_do_sysctl(
struct xen_sysctl *sysctl, XEN_GUEST_HANDLE_PARAM(xen_sysctl_t) u_sysctl)
{
long ret = 0;
switch ( sysctl->cmd )
{
case XEN_SYSCTL_cpu_hotplug:
{
unsigned int cpu = sysctl->u.cpu_hotplug.cpu;
unsigned int op = sysctl->u.cpu_hotplug.op;
bool plug;
long (*fn)(void *);
void *hcpu;
switch ( op )
{
case XEN_SYSCTL_CPU_HOTPLUG_ONLINE:
plug = true;
fn = cpu_up_helper;
hcpu = _p(cpu);
break;
case XEN_SYSCTL_CPU_HOTPLUG_OFFLINE:
plug = false;
fn = cpu_down_helper;
hcpu = _p(cpu);
break;
case XEN_SYSCTL_CPU_HOTPLUG_SMT_ENABLE:
case XEN_SYSCTL_CPU_HOTPLUG_SMT_DISABLE:
if ( !cpu_has_htt || boot_cpu_data.x86_num_siblings < 2 )
{
ret = -EOPNOTSUPP;
break;
}
if ( sched_disable_smt_switching )
{
ret = -EBUSY;
break;
}
if ( CONFIG_NR_CPUS <= 1 )
/* Mimic behavior of smt_up_down_helper(). */
return 0;
plug = op == XEN_SYSCTL_CPU_HOTPLUG_SMT_ENABLE;
fn = smt_up_down_helper;
hcpu = _p(plug);
break;
default:
ret = -EOPNOTSUPP;
break;
}
if ( !ret )
ret = plug ? xsm_resource_plug_core(XSM_HOOK)
: xsm_resource_unplug_core(XSM_HOOK);
if ( !ret )
ret = continue_hypercall_on_cpu(0, fn, hcpu);
}
break;
case XEN_SYSCTL_psr_cmt_op:
if ( !psr_cmt_enabled() )
return -ENODEV;
if ( sysctl->u.psr_cmt_op.flags != 0 )
return -EINVAL;
switch ( sysctl->u.psr_cmt_op.cmd )
{
case XEN_SYSCTL_PSR_CMT_enabled:
sysctl->u.psr_cmt_op.u.data =
(psr_cmt->features & PSR_RESOURCE_TYPE_L3) &&
(psr_cmt->l3.features & PSR_CMT_L3_OCCUPANCY);
break;
case XEN_SYSCTL_PSR_CMT_get_total_rmid:
sysctl->u.psr_cmt_op.u.data = psr_cmt->rmid_max;
break;
case XEN_SYSCTL_PSR_CMT_get_l3_upscaling_factor:
sysctl->u.psr_cmt_op.u.data = psr_cmt->l3.upscaling_factor;
break;
case XEN_SYSCTL_PSR_CMT_get_l3_cache_size:
{
struct l3_cache_info info;
unsigned int cpu = sysctl->u.psr_cmt_op.u.l3_cache.cpu;
if ( (cpu >= nr_cpu_ids) || !cpu_online(cpu) )
{
ret = -ENODEV;
sysctl->u.psr_cmt_op.u.data = 0;
break;
}
if ( cpu == smp_processor_id() )
l3_cache_get(&info);
else
on_selected_cpus(cpumask_of(cpu), l3_cache_get, &info, 1);
ret = info.ret;
sysctl->u.psr_cmt_op.u.data = (ret ? 0 : info.size);
break;
}
case XEN_SYSCTL_PSR_CMT_get_l3_event_mask:
sysctl->u.psr_cmt_op.u.data = psr_cmt->l3.features;
break;
default:
sysctl->u.psr_cmt_op.u.data = 0;
ret = -ENOSYS;
break;
}
if ( __copy_to_guest(u_sysctl, sysctl, 1) )
ret = -EFAULT;
break;
case XEN_SYSCTL_psr_alloc:
{
uint32_t data[PSR_INFO_ARRAY_SIZE] = { };
switch ( sysctl->u.psr_alloc.cmd )
{
case XEN_SYSCTL_PSR_get_l3_info:
ret = psr_get_info(sysctl->u.psr_alloc.target,
PSR_TYPE_L3_CBM, data, ARRAY_SIZE(data));
if ( ret )
break;
sysctl->u.psr_alloc.u.cat_info.cos_max =
data[PSR_INFO_IDX_COS_MAX];
sysctl->u.psr_alloc.u.cat_info.cbm_len =
data[PSR_INFO_IDX_CAT_CBM_LEN];
sysctl->u.psr_alloc.u.cat_info.flags =
data[PSR_INFO_IDX_CAT_FLAGS];
if ( __copy_field_to_guest(u_sysctl, sysctl, u.psr_alloc) )
ret = -EFAULT;
break;
case XEN_SYSCTL_PSR_get_l2_info:
ret = psr_get_info(sysctl->u.psr_alloc.target,
PSR_TYPE_L2_CBM, data, ARRAY_SIZE(data));
if ( ret )
break;
sysctl->u.psr_alloc.u.cat_info.cos_max =
data[PSR_INFO_IDX_COS_MAX];
sysctl->u.psr_alloc.u.cat_info.cbm_len =
data[PSR_INFO_IDX_CAT_CBM_LEN];
sysctl->u.psr_alloc.u.cat_info.flags =
data[PSR_INFO_IDX_CAT_FLAGS];
if ( __copy_field_to_guest(u_sysctl, sysctl, u.psr_alloc) )
ret = -EFAULT;
break;
case XEN_SYSCTL_PSR_get_mba_info:
ret = psr_get_info(sysctl->u.psr_alloc.target,
PSR_TYPE_MBA_THRTL, data, ARRAY_SIZE(data));
if ( ret )
break;
sysctl->u.psr_alloc.u.mba_info.cos_max =
data[PSR_INFO_IDX_COS_MAX];
sysctl->u.psr_alloc.u.mba_info.thrtl_max =
data[PSR_INFO_IDX_MBA_THRTL_MAX];
sysctl->u.psr_alloc.u.mba_info.flags =
data[PSR_INFO_IDX_MBA_FLAGS];
if ( __copy_field_to_guest(u_sysctl, sysctl, u.psr_alloc) )
ret = -EFAULT;
break;
default:
ret = -EOPNOTSUPP;
break;
}
break;
}
case XEN_SYSCTL_get_cpu_levelling_caps:
sysctl->u.cpu_levelling_caps.caps = levelling_caps;
if ( __copy_field_to_guest(u_sysctl, sysctl, u.cpu_levelling_caps.caps) )
ret = -EFAULT;
break;
case XEN_SYSCTL_get_cpu_featureset:
{
static const struct cpu_policy *const policy_table[6] = {
[XEN_SYSCTL_cpu_featureset_raw] = &raw_cpu_policy,
[XEN_SYSCTL_cpu_featureset_host] = &host_cpu_policy,
#ifdef CONFIG_PV
[XEN_SYSCTL_cpu_featureset_pv] = &pv_def_cpu_policy,
[XEN_SYSCTL_cpu_featureset_pv_max] = &pv_max_cpu_policy,
#endif
#ifdef CONFIG_HVM
[XEN_SYSCTL_cpu_featureset_hvm] = &hvm_def_cpu_policy,
[XEN_SYSCTL_cpu_featureset_hvm_max] = &hvm_max_cpu_policy,
#endif
};
const struct cpu_policy *p = NULL;
uint32_t featureset[FSCAPINTS];
unsigned int nr;
/* Request for maximum number of features? */
if ( guest_handle_is_null(sysctl->u.cpu_featureset.features) )
{
sysctl->u.cpu_featureset.nr_features = FSCAPINTS;
if ( __copy_field_to_guest(u_sysctl, sysctl,
u.cpu_featureset.nr_features) )
ret = -EFAULT;
break;
}
/* Clip the number of entries. */
nr = min_t(unsigned int, sysctl->u.cpu_featureset.nr_features,
FSCAPINTS);
/* Look up requested featureset. */
if ( sysctl->u.cpu_featureset.index < ARRAY_SIZE(policy_table) )
{
p = policy_table[sysctl->u.cpu_featureset.index];
if ( !p )
ret = -EOPNOTSUPP;
}
else
/* Bad featureset index? */
ret = -EINVAL;
if ( !ret )
x86_cpu_policy_to_featureset(p, featureset);
/* Copy the requested featureset into place. */
if ( !ret && copy_to_guest(sysctl->u.cpu_featureset.features,
featureset, nr) )
ret = -EFAULT;
/* Inform the caller of how many features we wrote. */
sysctl->u.cpu_featureset.nr_features = nr;
if ( !ret && __copy_field_to_guest(u_sysctl, sysctl,
u.cpu_featureset.nr_features) )
ret = -EFAULT;
/* Inform the caller if there was more data to provide. */
if ( !ret && nr < FSCAPINTS )
ret = -ENOBUFS;
break;
}
case XEN_SYSCTL_get_cpu_policy:
{
static const struct cpu_policy *const system_policies[6] = {
[XEN_SYSCTL_cpu_policy_raw] = &raw_cpu_policy,
[XEN_SYSCTL_cpu_policy_host] = &host_cpu_policy,
#ifdef CONFIG_PV
[XEN_SYSCTL_cpu_policy_pv_max] = &pv_max_cpu_policy,
[XEN_SYSCTL_cpu_policy_pv_default] = &pv_def_cpu_policy,
#endif
#ifdef CONFIG_HVM
[XEN_SYSCTL_cpu_policy_hvm_max] = &hvm_max_cpu_policy,
[XEN_SYSCTL_cpu_policy_hvm_default] = &hvm_def_cpu_policy,
#endif
};
const struct cpu_policy *policy;
/* Reserved field set, or bad policy index? */
if ( sysctl->u.cpu_policy._rsvd ||
sysctl->u.cpu_policy.index >= ARRAY_SIZE(system_policies) )
{
ret = -EINVAL;
break;
}
policy = system_policies[
array_index_nospec(sysctl->u.cpu_policy.index,
ARRAY_SIZE(system_policies))];
if ( !policy )
{
ret = -EOPNOTSUPP;
break;
}
/* Process the CPUID leaves. */
if ( guest_handle_is_null(sysctl->u.cpu_policy.leaves) )
sysctl->u.cpu_policy.nr_leaves = CPUID_MAX_SERIALISED_LEAVES;
else if ( (ret = x86_cpuid_copy_to_buffer(
policy,
sysctl->u.cpu_policy.leaves,
&sysctl->u.cpu_policy.nr_leaves)) )
break;
if ( __copy_field_to_guest(u_sysctl, sysctl,
u.cpu_policy.nr_leaves) )
{
ret = -EFAULT;
break;
}
/* Process the MSR entries. */
if ( guest_handle_is_null(sysctl->u.cpu_policy.msrs) )
sysctl->u.cpu_policy.nr_msrs = MSR_MAX_SERIALISED_ENTRIES;
else if ( (ret = x86_msr_copy_to_buffer(
policy,
sysctl->u.cpu_policy.msrs,
&sysctl->u.cpu_policy.nr_msrs)) )
break;
if ( __copy_field_to_guest(u_sysctl, sysctl,
u.cpu_policy.nr_msrs) )
ret = -EFAULT;
break;
}
default:
ret = -ENOSYS;
break;
}
return ret;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
|
