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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 2/8] x86: handle CQM resource when creating/destroying guests
From: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
Allocate an RMID for a guest when it is created. This per-guest
RMID will be used to monitor Cache QoS related data. The RMID will
be relinquished when guest is destroyed.
Signed-off-by: Jiongxi Li <jiongxi.li@xxxxxxxxx>
Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
---
xen/arch/x86/domain.c | 9 +++++++
xen/arch/x86/pqos.c | 59 ++++++++++++++++++++++++++++++++++++++++++
xen/common/domctl.c | 5 +++-
xen/include/asm-x86/domain.h | 2 ++
xen/include/asm-x86/pqos.h | 4 +++
xen/include/public/domctl.h | 3 +++
xen/include/xen/sched.h | 3 +++
7 files changed, 84 insertions(+), 1 deletion(-)
diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index a3868f9..9725649 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -60,6 +60,7 @@
#include <xen/numa.h>
#include <xen/iommu.h>
#include <compat/vcpu.h>
+#include <asm/pqos.h>
DEFINE_PER_CPU(struct vcpu *, curr_vcpu);
DEFINE_PER_CPU(unsigned long, cr4);
@@ -579,6 +580,11 @@ int arch_domain_create(struct domain *d, unsigned int
domcr_flags)
tsc_set_info(d, TSC_MODE_DEFAULT, 0UL, 0, 0);
spin_lock_init(&d->arch.vtsc_lock);
+ /* Allocate CQM RMID for guest */
+ d->arch.pqos_cqm_rmid = 0;
+ if ( system_supports_cqm() && !!(domcr_flags & DOMCRF_pqos_cqm) )
+ alloc_cqm_rmid(d);
+
return 0;
fail:
@@ -612,6 +618,9 @@ void arch_domain_destroy(struct domain *d)
free_xenheap_page(d->shared_info);
cleanup_domain_irq_mapping(d);
+
+ if ( system_supports_cqm() )
+ free_cqm_rmid(d);
}
unsigned long pv_guest_cr4_fixup(const struct vcpu *v, unsigned long guest_cr4)
diff --git a/xen/arch/x86/pqos.c b/xen/arch/x86/pqos.c
index e6ab416..e294799 100644
--- a/xen/arch/x86/pqos.c
+++ b/xen/arch/x86/pqos.c
@@ -20,6 +20,8 @@
*/
#include <asm/processor.h>
#include <xen/init.h>
+#include <xen/spinlock.h>
+#include <xen/sched.h>
#include <asm/pqos.h>
static bool_t pqos_enabled = 1;
@@ -29,6 +31,7 @@ unsigned int cqm_res_count = 0;
unsigned int cqm_upscaling_factor = 0;
bool_t cqm_enabled = 0;
struct cqm_res_struct *cqm_res_array = NULL;
+static DEFINE_SPINLOCK(cqm_lock);
static void __init init_cqm(void)
{
@@ -78,6 +81,62 @@ void __init init_platform_qos(void)
init_qos_monitor();
}
+bool_t system_supports_cqm(void)
+{
+ return cqm_enabled;
+}
+
+int alloc_cqm_rmid(struct domain *d)
+{
+ int rmid, rc = 0;
+ unsigned long flags;
+
+ ASSERT(system_supports_cqm());
+
+ spin_lock_irqsave(&cqm_lock, flags);
+ /* RMID=0 is reserved, enumerate from 1 */
+ for ( rmid = 1; rmid < cqm_res_count; rmid++ )
+ {
+ if ( cqm_res_array[rmid].inuse)
+ continue;
+
+ cqm_res_array[rmid].inuse = 1;
+ cqm_res_array[rmid].domain_id = d->domain_id;
+ break;
+ }
+ spin_unlock_irqrestore(&cqm_lock, flags);
+
+ /* No CQM RMID available, assign RMID=0 by default */
+ if ( rmid == cqm_res_count )
+ {
+ rmid = 0;
+ rc = -1;
+ }
+
+ d->arch.pqos_cqm_rmid = rmid;
+
+ return rc;
+}
+
+void free_cqm_rmid(struct domain *d)
+{
+ int rmid = d->arch.pqos_cqm_rmid;
+ unsigned long flags;
+
+ ASSERT(system_supports_cqm());
+
+ spin_lock_irqsave(&cqm_lock, flags);
+ /* We do not free system reserved "RMID=0" */
+ if ( rmid > 0 )
+ {
+ cqm_res_array[rmid].inuse = 0;
+ cqm_res_array[rmid].domain_id = 0;
+ }
+ spin_unlock_irqrestore(&cqm_lock, flags);
+
+ d->arch.pqos_cqm_rmid = 0;
+}
+
/*
* Local variables:
* mode: C
diff --git a/xen/common/domctl.c b/xen/common/domctl.c
index 904d27b..1c2e320 100644
--- a/xen/common/domctl.c
+++ b/xen/common/domctl.c
@@ -425,7 +425,8 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t)
u_domctl)
| XEN_DOMCTL_CDF_pvh_guest
| XEN_DOMCTL_CDF_hap
| XEN_DOMCTL_CDF_s3_integrity
- | XEN_DOMCTL_CDF_oos_off)) )
+ | XEN_DOMCTL_CDF_oos_off
+ | XEN_DOMCTL_CDF_pqos_cqm)) )
break;
dom = op->domain;
@@ -467,6 +468,8 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t)
u_domctl)
domcr_flags |= DOMCRF_s3_integrity;
if ( op->u.createdomain.flags & XEN_DOMCTL_CDF_oos_off )
domcr_flags |= DOMCRF_oos_off;
+ if ( op->u.createdomain.flags & XEN_DOMCTL_CDF_pqos_cqm )
+ domcr_flags |= DOMCRF_pqos_cqm;
d = domain_create(dom, domcr_flags, op->u.createdomain.ssidref);
if ( IS_ERR(d) )
diff --git a/xen/include/asm-x86/domain.h b/xen/include/asm-x86/domain.h
index 9d39061..b0479aa 100644
--- a/xen/include/asm-x86/domain.h
+++ b/xen/include/asm-x86/domain.h
@@ -313,6 +313,8 @@ struct arch_domain
spinlock_t e820_lock;
struct e820entry *e820;
unsigned int nr_e820;
+
+ int pqos_cqm_rmid; /* CQM RMID assigned to the domain */
} __cacheline_aligned;
#define has_arch_pdevs(d) (!list_empty(&(d)->arch.pdev_list))
diff --git a/xen/include/asm-x86/pqos.h b/xen/include/asm-x86/pqos.h
index 934d68a..88de139 100644
--- a/xen/include/asm-x86/pqos.h
+++ b/xen/include/asm-x86/pqos.h
@@ -34,4 +34,8 @@ struct cqm_res_struct {
void init_platform_qos(void);
+bool_t system_supports_cqm(void);
+int alloc_cqm_rmid(struct domain *);
+void free_cqm_rmid(struct domain *);
+
#endif
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index 01a3652..47a850a 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -62,6 +62,9 @@ struct xen_domctl_createdomain {
/* Is this a PVH guest (as opposed to an HVM or PV guest)? */
#define _XEN_DOMCTL_CDF_pvh_guest 4
#define XEN_DOMCTL_CDF_pvh_guest (1U<<_XEN_DOMCTL_CDF_pvh_guest)
+ /* Enable pqos-cqm? */
+#define _XEN_DOMCTL_CDF_pqos_cqm 5
+#define XEN_DOMCTL_CDF_pqos_cqm (1U<<_XEN_DOMCTL_CDF_pqos_cqm)
uint32_t flags;
};
typedef struct xen_domctl_createdomain xen_domctl_createdomain_t;
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index cbdf377..3a42656 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -507,6 +507,9 @@ struct domain *domain_create(
/* DOMCRF_pvh: Create PV domain in HVM container. */
#define _DOMCRF_pvh 5
#define DOMCRF_pvh (1U<<_DOMCRF_pvh)
+ /* DOMCRF_pqos_cqm: Create a domain with CQM support */
+#define _DOMCRF_pqos_cqm 6
+#define DOMCRF_pqos_cqm (1U<<_DOMCRF_pqos_cqm)
/*
* rcu_lock_domain_by_id() is more efficient than get_domain_by_id().
--
1.7.9.5
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