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KVM: introduce kvm_make_vcpus_request_mask() API

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Hyper-V style PV TLB flush hypercalls inmplementation will use this API.
To avoid memory allocation in CONFIG_CPUMASK_OFFSTACK case add
cpumask_var_t argument.

Signed-off-by: Vitaly Kuznetsov <[email protected]>
Signed-off-by: Radim Krčmář <[email protected]>
This commit is contained in:
Vitaly Kuznetsov 2018-05-16 17:21:28 +02:00 • committed by Radim Krčmář
commit 7053df4edb
2 changed files with 29 additions and 8 deletions
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34
virt/kvm/kvm_main.c
View file

@ -203,29 +203,47 @@ static inline bool kvm_kick_many_cpus(const struct cpumask *cpus, bool wait)
return true;
}
bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
unsigned long *vcpu_bitmap, cpumask_var_t tmp)
{
int i, cpu, me;
cpumask_var_t cpus;
bool called;
struct kvm_vcpu *vcpu;
zalloc_cpumask_var(&cpus, GFP_ATOMIC);
bool called;
me = get_cpu();
kvm_for_each_vcpu(i, vcpu, kvm) {
if (!test_bit(i, vcpu_bitmap))
continue;
kvm_make_request(req, vcpu);
cpu = vcpu->cpu;
if (!(req & KVM_REQUEST_NO_WAKEUP) && kvm_vcpu_wake_up(vcpu))
continue;
if (cpus != NULL && cpu != -1 && cpu != me &&
if (tmp != NULL && cpu != -1 && cpu != me &&
kvm_request_needs_ipi(vcpu, req))
__cpumask_set_cpu(cpu, cpus);
__cpumask_set_cpu(cpu, tmp);
}
called = kvm_kick_many_cpus(cpus, !!(req & KVM_REQUEST_WAIT));
called = kvm_kick_many_cpus(tmp, !!(req & KVM_REQUEST_WAIT));
put_cpu();
return called;
}
bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
{
cpumask_var_t cpus;
bool called;
static unsigned long vcpu_bitmap[BITS_TO_LONGS(KVM_MAX_VCPUS)]
= {[0 ... BITS_TO_LONGS(KVM_MAX_VCPUS)-1] = ULONG_MAX};
zalloc_cpumask_var(&cpus, GFP_ATOMIC);
called = kvm_make_vcpus_request_mask(kvm, req, vcpu_bitmap, cpus);
free_cpumask_var(cpus);
return called;
}