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authorJes Sorensen <jes@sgi.com>2009-01-21 15:16:43 +0100
committerAvi Kivity <avi@redhat.com>2009-03-24 11:03:07 +0200
commit934d534f8a5a39e20d5682b3a3a45ff351706b59 (patch)
treef1e6ce5330028a9aa942623c6706af8ca2ce2130 /arch
parentb7e6e4d3602c738b8f61225d9f4514945df52f07 (diff)
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KVM: ia64: dynamic nr online cpus
Account for number of online cpus and use that in loops iterating over the list of vpus instead of scanning the full array unconditionally. This patch is a building block to facilitate allowing to bump up the size of MAX_VCPUS significantly. Signed-off-by: Jes Sorensen <jes@sgi.com> Acked-by : Xiantao Zhang <xiantao.zhang@intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/ia64/include/asm/kvm_host.h10
-rw-r--r--arch/ia64/kvm/kvm-ia64.c12
-rw-r--r--arch/ia64/kvm/vcpu.c5
3 files changed, 18 insertions, 9 deletions
diff --git a/arch/ia64/include/asm/kvm_host.h b/arch/ia64/include/asm/kvm_host.h
index 46f8b0eb568..4542651e6ac 100644
--- a/arch/ia64/include/asm/kvm_host.h
+++ b/arch/ia64/include/asm/kvm_host.h
@@ -157,10 +157,10 @@ struct kvm_vm_data {
struct kvm_vcpu_data vcpu_data[KVM_MAX_VCPUS];
};
-#define VCPU_BASE(n) KVM_VM_DATA_BASE + \
- offsetof(struct kvm_vm_data, vcpu_data[n])
-#define VM_BASE KVM_VM_DATA_BASE + \
- offsetof(struct kvm_vm_data, kvm_vm_struct)
+#define VCPU_BASE(n) (KVM_VM_DATA_BASE + \
+ offsetof(struct kvm_vm_data, vcpu_data[n]))
+#define KVM_VM_BASE (KVM_VM_DATA_BASE + \
+ offsetof(struct kvm_vm_data, kvm_vm_struct))
#define KVM_MEM_DIRTY_LOG_BASE KVM_VM_DATA_BASE + \
offsetof(struct kvm_vm_data, kvm_mem_dirty_log)
@@ -464,6 +464,8 @@ struct kvm_arch {
unsigned long metaphysical_rr4;
unsigned long vmm_init_rr;
+ int online_vcpus;
+
struct kvm_ioapic *vioapic;
struct kvm_vm_stat stat;
struct kvm_sal_data rdv_sal_data;
diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index dbf527a5734..9c77e3939e9 100644
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -314,7 +314,7 @@ static struct kvm_vcpu *lid_to_vcpu(struct kvm *kvm, unsigned long id,
union ia64_lid lid;
int i;
- for (i = 0; i < KVM_MAX_VCPUS; i++) {
+ for (i = 0; i < kvm->arch.online_vcpus; i++) {
if (kvm->vcpus[i]) {
lid.val = VCPU_LID(kvm->vcpus[i]);
if (lid.id == id && lid.eid == eid)
@@ -388,7 +388,7 @@ static int handle_global_purge(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
call_data.ptc_g_data = p->u.ptc_g_data;
- for (i = 0; i < KVM_MAX_VCPUS; i++) {
+ for (i = 0; i < kvm->arch.online_vcpus; i++) {
if (!kvm->vcpus[i] || kvm->vcpus[i]->arch.mp_state ==
KVM_MP_STATE_UNINITIALIZED ||
vcpu == kvm->vcpus[i])
@@ -788,6 +788,8 @@ struct kvm *kvm_arch_create_vm(void)
return ERR_PTR(-ENOMEM);
kvm_init_vm(kvm);
+ kvm->arch.online_vcpus = 0;
+
return kvm;
}
@@ -1154,7 +1156,7 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
/*Initialize itc offset for vcpus*/
itc_offset = 0UL - ia64_getreg(_IA64_REG_AR_ITC);
- for (i = 0; i < KVM_MAX_VCPUS; i++) {
+ for (i = 0; i < kvm->arch.online_vcpus; i++) {
v = (struct kvm_vcpu *)((char *)vcpu +
sizeof(struct kvm_vcpu_data) * i);
v->arch.itc_offset = itc_offset;
@@ -1288,6 +1290,8 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
goto fail;
}
+ kvm->arch.online_vcpus++;
+
return vcpu;
fail:
return ERR_PTR(r);
@@ -1828,7 +1832,7 @@ struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector,
struct kvm_vcpu *lvcpu = kvm->vcpus[0];
int i;
- for (i = 1; i < KVM_MAX_VCPUS; i++) {
+ for (i = 1; i < kvm->arch.online_vcpus; i++) {
if (!kvm->vcpus[i])
continue;
if (lvcpu->arch.xtp > kvm->vcpus[i]->arch.xtp)
diff --git a/arch/ia64/kvm/vcpu.c b/arch/ia64/kvm/vcpu.c
index 4d8be4c252f..d4d28050587 100644
--- a/arch/ia64/kvm/vcpu.c
+++ b/arch/ia64/kvm/vcpu.c
@@ -807,12 +807,15 @@ static inline void vcpu_set_itm(struct kvm_vcpu *vcpu, u64 val);
static void vcpu_set_itc(struct kvm_vcpu *vcpu, u64 val)
{
struct kvm_vcpu *v;
+ struct kvm *kvm;
int i;
long itc_offset = val - ia64_getreg(_IA64_REG_AR_ITC);
unsigned long vitv = VCPU(vcpu, itv);
+ kvm = (struct kvm *)KVM_VM_BASE;
+
if (vcpu->vcpu_id == 0) {
- for (i = 0; i < KVM_MAX_VCPUS; i++) {
+ for (i = 0; i < kvm->arch.online_vcpus; i++) {
v = (struct kvm_vcpu *)((char *)vcpu +
sizeof(struct kvm_vcpu_data) * i);
VMX(v, itc_offset) = itc_offset;