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Date: Fri, 18 Jul 2014 01:57:25 -0400
From: Elena Ufimtseva <ufimtseva@...il.com>
To: xen-devel@...ts.xenproject.org
Cc: konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
david.vrabel@...rix.com, tglx@...utronix.de, mingo@...hat.com,
hpa@...or.com, x86@...nel.org, akpm@...ux-foundation.org,
tangchen@...fujitsu.com, wency@...fujitsu.com,
ian.campbell@...rix.com, stefano.stabellini@...citrix.com,
mukesh.rathor@...cle.com, linux-kernel@...r.kernel.org,
Elena Ufimtseva <ufimtseva@...il.com>
Subject: [PATCH v6 1/1] xen: vnuma for pv guests
Issues Xen hypercall subop XENMEM_get_vnumainfo and sets the
NUMA topology, otherwise sets dummy NUMA node and prevents
numa_init from calling other numa initializators as they dont
work with pv guests.
Signed-off-by: Elena Ufimtseva <ufimtseva@...il.com>
---
arch/x86/include/asm/xen/vnuma.h | 10 ++++
arch/x86/mm/numa.c | 3 +
arch/x86/xen/Makefile | 1 +
arch/x86/xen/setup.c | 6 +-
arch/x86/xen/vnuma.c | 120 ++++++++++++++++++++++++++++++++++++++
include/xen/interface/memory.h | 50 ++++++++++++++++
6 files changed, 189 insertions(+), 1 deletion(-)
create mode 100644 arch/x86/include/asm/xen/vnuma.h
create mode 100644 arch/x86/xen/vnuma.c
diff --git a/arch/x86/include/asm/xen/vnuma.h b/arch/x86/include/asm/xen/vnuma.h
new file mode 100644
index 0000000..8c8b098
--- /dev/null
+++ b/arch/x86/include/asm/xen/vnuma.h
@@ -0,0 +1,10 @@
+#ifndef _ASM_X86_VNUMA_H
+#define _ASM_X86_VNUMA_H
+
+#ifdef CONFIG_XEN
+int xen_numa_init(void);
+#else
+static inline int xen_numa_init(void) { return -1; };
+#endif
+
+#endif /* _ASM_X86_VNUMA_H */
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index a32b706..045a8b3 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -18,6 +18,7 @@
#include <asm/acpi.h>
#include <asm/amd_nb.h>
+#include "asm/xen/vnuma.h"
#include "numa_internal.h"
int __initdata numa_off;
@@ -687,6 +688,8 @@ static int __init dummy_numa_init(void)
void __init x86_numa_init(void)
{
if (!numa_off) {
+ if (!numa_init(xen_numa_init))
+ return;
#ifdef CONFIG_ACPI_NUMA
if (!numa_init(x86_acpi_numa_init))
return;
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index 96ab2c0..185ec9b 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -22,3 +22,4 @@ obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o
obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o
obj-$(CONFIG_XEN_DOM0) += apic.o vga.o
obj-$(CONFIG_SWIOTLB_XEN) += pci-swiotlb-xen.o
+obj-$(CONFIG_NUMA) += vnuma.o
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 2e555163..9dc0d3b 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -20,6 +20,7 @@
#include <asm/numa.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
+#include <asm/xen/vnuma.h>
#include <xen/xen.h>
#include <xen/page.h>
@@ -642,6 +643,9 @@ void __init xen_arch_setup(void)
WARN_ON(xen_set_default_idle());
fiddle_vdso();
#ifdef CONFIG_NUMA
- numa_off = 1;
+ if (xen_initial_domain())
+ numa_off = 1;
+ else
+ numa_off = 0;
#endif
}
diff --git a/arch/x86/xen/vnuma.c b/arch/x86/xen/vnuma.c
new file mode 100644
index 0000000..73f052f
--- /dev/null
+++ b/arch/x86/xen/vnuma.c
@@ -0,0 +1,120 @@
+#include <linux/err.h>
+#include <linux/memblock.h>
+#include <xen/interface/xen.h>
+#include <xen/interface/memory.h>
+#include <asm/xen/interface.h>
+#include <asm/xen/hypercall.h>
+#include <asm/xen/vnuma.h>
+
+/*
+ * Called from numa_init if numa_off = 0.
+ */
+int __init xen_numa_init(void)
+{
+ unsigned int i, j, idx;
+ unsigned int cpu, pcpus, nr_nodes, nr_cpus;
+ unsigned int *vdistance, *cpu_to_node;
+ unsigned long mem_size, dist_size, cpu_to_node_size;
+ struct vmemrange *vmem;
+ u64 physm, physd, physc;
+ int rc;
+
+ struct vnuma_topology_info numa_topo = {
+ .domid = DOMID_SELF
+ };
+
+ rc = -EINVAL;
+ physm = physd = physc = 0;
+
+ if (!xen_pv_domain())
+ return rc;
+
+ /* get the number of nodes for allocation of memblocks. */
+ pcpus = num_possible_cpus();
+ nr_cpus = setup_max_cpus < pcpus ? setup_max_cpus : pcpus;
+
+ /* support for nodes with at least one cpu per node. */
+ nr_nodes = nr_cpus;
+
+ /*
+ * Allocate arrays for nr_cpus/nr_nodes sizes and let
+ * hypervisor know that these are the boundaries. Partial
+ * copy is not allowed and hypercall will fail.
+ */
+
+ mem_size = nr_nodes * sizeof(struct vmemrange);
+ dist_size = nr_nodes * nr_nodes * sizeof(*numa_topo.distance.h);
+ cpu_to_node_size = nr_cpus * sizeof(*numa_topo.cpu_to_node.h);
+
+ physm = memblock_alloc(mem_size, PAGE_SIZE);
+ physd = memblock_alloc(dist_size, PAGE_SIZE);
+ physc = memblock_alloc(cpu_to_node_size, PAGE_SIZE);
+
+ if (!physm || !physd || !physc)
+ goto out;
+
+ vmem = __va(physm);
+ vdistance = __va(physd);
+ cpu_to_node = __va(physc);
+
+ numa_topo.nr_nodes = nr_nodes;
+ numa_topo.nr_cpus = nr_cpus;
+
+ set_xen_guest_handle(numa_topo.memrange.h, vmem);
+ set_xen_guest_handle(numa_topo.distance.h, vdistance);
+ set_xen_guest_handle(numa_topo.cpu_to_node.h, cpu_to_node);
+
+ if (HYPERVISOR_memory_op(XENMEM_get_vnuma_info, &numa_topo) < 0)
+ goto out;
+
+ /*
+ * NUMA nodes memory ranges are in pfns, constructed and
+ * aligned based on e820 ram domain map.
+ */
+ for (i = 0; i < nr_nodes; i++) {
+ if (numa_add_memblk(i, vmem[i].start, vmem[i].end))
+ goto out;
+ node_set(i, numa_nodes_parsed);
+ }
+
+ setup_nr_node_ids();
+ /* Setting the cpu, apicid to node. */
+ for_each_cpu(cpu, cpu_possible_mask) {
+ set_apicid_to_node(cpu, cpu_to_node[cpu]);
+ numa_set_node(cpu, cpu_to_node[cpu]);
+ cpumask_set_cpu(cpu, node_to_cpumask_map[cpu_to_node[cpu]]);
+ }
+
+ for (i = 0; i < nr_nodes; i++) {
+ for (j = 0; j < nr_nodes; j++) {
+ idx = (i * nr_nodes) + j;
+ numa_set_distance(i, j, *(vdistance + idx));
+ }
+ }
+
+ rc = 0;
+out:
+ if (physm)
+ memblock_free(__pa(physm), mem_size);
+ if (physd)
+ memblock_free(__pa(physd), dist_size);
+ if (physc)
+ memblock_free(__pa(physc), cpu_to_node_size);
+ /*
+ * Set a dummy node and return success. This prevents calling any
+ * hardware-specific initializers which do not work in a PV guest.
+ * Taken from dummy_numa_init code.
+ */
+ if (rc) {
+ for (i = 0; i < MAX_LOCAL_APIC; i++)
+ set_apicid_to_node(i, NUMA_NO_NODE);
+ nodes_clear(numa_nodes_parsed);
+ nodes_clear(node_possible_map);
+ nodes_clear(node_online_map);
+ node_set(0, numa_nodes_parsed);
+ /* cpus up to max_cpus will be assigned to one node. */
+ numa_add_memblk(0, 0, PFN_PHYS(max_pfn));
+ setup_nr_node_ids();
+ }
+ return 0;
+}
diff --git a/include/xen/interface/memory.h b/include/xen/interface/memory.h
index 2ecfe4f..96d6387 100644
--- a/include/xen/interface/memory.h
+++ b/include/xen/interface/memory.h
@@ -263,4 +263,54 @@ struct xen_remove_from_physmap {
};
DEFINE_GUEST_HANDLE_STRUCT(xen_remove_from_physmap);
+/* vNUMA structures */
+struct vmemrange {
+ uint64_t start, end;
+};
+DEFINE_GUEST_HANDLE_STRUCT(vmemrange);
+
+struct vnuma_topology_info {
+ /* OUT */
+ domid_t domid;
+ /*
+ * nr_nodes and nr_cpus are used for retreival of sizes
+ * of will be allocated arrays for vnuma topology.
+ * We need to know vcpus numberfor domain as NR_CPUS
+ * is less then domain max_vcpus, number of possible
+ * cpus will equal to NR_CPUS and we have no way of
+ * learning domain vcpus number.
+ */
+ /* number of virtual numa nodes */
+ unsigned int nr_nodes;
+ unsigned int nr_cpus;
+ /* distance table */
+ union {
+ GUEST_HANDLE(uint) h;
+ uint64_t _pad;
+ } distance;
+ /* cpu mapping to vnodes */
+ union {
+ GUEST_HANDLE(uint) h;
+ uint64_t _pad;
+ } cpu_to_node;
+ /*
+ * memory areas constructed by Xen, start and end
+ * of the ranges are specific to domain e820 map.
+ * Xen toolstack constructs these ranges for domain
+ * when building it.
+ */
+ union {
+ GUEST_HANDLE(vmemrange) h;
+ uint64_t _pad;
+ } memrange;
+};
+DEFINE_GUEST_HANDLE_STRUCT(vnuma_topology_info);
+
+/*
+ * Used to retreive vnuma topology info.
+ * Use XENMEM_get_vnuma_nodes to obtain number of
+ * nodes before allocating memory for topology.
+ */
+#define XENMEM_get_vnuma_info 26
+
#endif /* __XEN_PUBLIC_MEMORY_H__ */
--
1.7.10.4
--
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