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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v19 05/10] x86: dynamically attach/detach CMT service for a guest
Add hypervisor side support for dynamically attach and detach
Cache Monitoring Technology(CMT) services for a certain guest.
When attach CMT service for a guest, system will allocate an
RMID for it. When detach or guest is shutdown, the RMID will be
recycled for future use.
Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
Signed-off-by: Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
xen/arch/x86/domain.c | 3 +++
xen/arch/x86/domctl.c | 29 ++++++++++++++++++++++++++
xen/arch/x86/psr.c | 46 ++++++++++++++++++++++++++++++++++++++++++
xen/include/asm-x86/domain.h | 2 ++
xen/include/asm-x86/psr.h | 10 +++++++++
xen/include/public/domctl.h | 12 +++++++++++
6 files changed, 102 insertions(+)
diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 7b1dfe6..3cfd8f4 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/psr.h>
DEFINE_PER_CPU(struct vcpu *, curr_vcpu);
DEFINE_PER_CPU(unsigned long, cr4);
@@ -647,6 +648,8 @@ void arch_domain_destroy(struct domain *d)
free_xenheap_page(d->shared_info);
cleanup_domain_irq_mapping(d);
+
+ psr_free_rmid(d);
}
unsigned long pv_guest_cr4_fixup(const struct vcpu *v, unsigned long guest_cr4)
diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
index 7a5de43..6ed480a 100644
--- a/xen/arch/x86/domctl.c
+++ b/xen/arch/x86/domctl.c
@@ -35,6 +35,7 @@
#include <asm/mem_sharing.h>
#include <asm/xstate.h>
#include <asm/debugger.h>
+#include <asm/psr.h>
static int gdbsx_guest_mem_io(
domid_t domid, struct xen_domctl_gdbsx_memio *iop)
@@ -1319,6 +1320,34 @@ long arch_do_domctl(
}
break;
+ case XEN_DOMCTL_psr_cmt_op:
+ if ( !psr_cmt_enabled() )
+ {
+ ret = -ENODEV;
+ break;
+ }
+
+ switch ( domctl->u.psr_cmt_op.cmd )
+ {
+ case XEN_DOMCTL_PSR_CMT_OP_ATTACH:
+ ret = psr_alloc_rmid(d);
+ break;
+ case XEN_DOMCTL_PSR_CMT_OP_DETACH:
+ if ( d->arch.psr_rmid > 0 )
+ psr_free_rmid(d);
+ else
+ ret = -ENOENT;
+ break;
+ case XEN_DOMCTL_PSR_CMT_OP_QUERY_RMID:
+ domctl->u.psr_cmt_op.data = d->arch.psr_rmid;
+ copyback = 1;
+ break;
+ default:
+ ret = -ENOSYS;
+ break;
+ }
+ break;
+
default:
ret = iommu_do_domctl(domctl, d, u_domctl);
break;
diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c
index d3c749c..68ca41d 100644
--- a/xen/arch/x86/psr.c
+++ b/xen/arch/x86/psr.c
@@ -15,6 +15,7 @@
*/
#include <xen/init.h>
#include <xen/cpu.h>
+#include <xen/sched.h>
#include <asm/psr.h>
#define PSR_CMT (1<<0)
@@ -119,6 +120,51 @@ static int __init init_psr(void)
}
__initcall(init_psr);
+/* Called with domain lock held, no psr specific lock needed */
+int psr_alloc_rmid(struct domain *d)
+{
+ unsigned int rmid;
+
+ ASSERT(psr_cmt_enabled());
+
+ if ( d->arch.psr_rmid > 0 )
+ return -EEXIST;
+
+ for ( rmid = 1; rmid <= psr_cmt->rmid_max; rmid++ )
+ {
+ if ( psr_cmt->rmid_to_dom[rmid] != DOMID_INVALID )
+ continue;
+
+ psr_cmt->rmid_to_dom[rmid] = d->domain_id;
+ break;
+ }
+
+ /* No RMID available, assign RMID=0 by default. */
+ if ( rmid > psr_cmt->rmid_max )
+ {
+ d->arch.psr_rmid = 0;
+ return -EUSERS;
+ }
+
+ d->arch.psr_rmid = rmid;
+
+ return 0;
+}
+
+/* Called with domain lock held, no psr specific lock needed */
+void psr_free_rmid(struct domain *d)
+{
+ unsigned int rmid;
+
+ rmid = d->arch.psr_rmid;
+ /* We do not free system reserved "RMID=0". */
+ if ( rmid == 0 )
+ return;
+
+ psr_cmt->rmid_to_dom[rmid] = DOMID_INVALID;
+ d->arch.psr_rmid = 0;
+}
+
/*
* Local variables:
* mode: C
diff --git a/xen/include/asm-x86/domain.h b/xen/include/asm-x86/domain.h
index 7abe1b3..2be1d1e 100644
--- a/xen/include/asm-x86/domain.h
+++ b/xen/include/asm-x86/domain.h
@@ -314,6 +314,8 @@ struct arch_domain
/* Shared page for notifying that explicit PIRQ EOI is required. */
unsigned long *pirq_eoi_map;
unsigned long pirq_eoi_map_mfn;
+
+ unsigned int psr_rmid; /* RMID assigned to the domain for CMT */
} __cacheline_aligned;
#define has_arch_pdevs(d) (!list_empty(&(d)->arch.pdev_list))
diff --git a/xen/include/asm-x86/psr.h b/xen/include/asm-x86/psr.h
index 60420f2..33f81f6 100644
--- a/xen/include/asm-x86/psr.h
+++ b/xen/include/asm-x86/psr.h
@@ -16,6 +16,8 @@
#ifndef __ASM_PSR_H__
#define __ASM_PSR_H__
+#include <xen/types.h>
+
/* Resource Type Enumeration */
#define PSR_RESOURCE_TYPE_L3 0x2
@@ -37,6 +39,14 @@ struct psr_cmt {
extern struct psr_cmt *psr_cmt;
+static inline bool_t psr_cmt_enabled(void)
+{
+ return !!psr_cmt;
+}
+
+int psr_alloc_rmid(struct domain *d);
+void psr_free_rmid(struct domain *d);
+
#endif /* __ASM_PSR_H__ */
/*
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index cfa39b3..59220ed 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -965,6 +965,16 @@ struct xen_domctl_vnuma {
typedef struct xen_domctl_vnuma xen_domctl_vnuma_t;
DEFINE_XEN_GUEST_HANDLE(xen_domctl_vnuma_t);
+struct xen_domctl_psr_cmt_op {
+#define XEN_DOMCTL_PSR_CMT_OP_DETACH 0
+#define XEN_DOMCTL_PSR_CMT_OP_ATTACH 1
+#define XEN_DOMCTL_PSR_CMT_OP_QUERY_RMID 2
+ uint32_t cmd;
+ uint32_t data;
+};
+typedef struct xen_domctl_psr_cmt_op xen_domctl_psr_cmt_op_t;
+DEFINE_XEN_GUEST_HANDLE(xen_domctl_psr_cmt_op_t);
+
struct xen_domctl {
uint32_t cmd;
#define XEN_DOMCTL_createdomain 1
@@ -1038,6 +1048,7 @@ struct xen_domctl {
#define XEN_DOMCTL_get_vcpu_msrs 72
#define XEN_DOMCTL_set_vcpu_msrs 73
#define XEN_DOMCTL_setvnumainfo 74
+#define XEN_DOMCTL_psr_cmt_op 75
#define XEN_DOMCTL_gdbsx_guestmemio 1000
#define XEN_DOMCTL_gdbsx_pausevcpu 1001
#define XEN_DOMCTL_gdbsx_unpausevcpu 1002
@@ -1099,6 +1110,7 @@ struct xen_domctl {
struct xen_domctl_gdbsx_pauseunp_vcpu gdbsx_pauseunp_vcpu;
struct xen_domctl_gdbsx_domstatus gdbsx_domstatus;
struct xen_domctl_vnuma vnuma;
+ struct xen_domctl_psr_cmt_op psr_cmt_op;
uint8_t pad[128];
} u;
};
--
1.7.9.5
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