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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2018-05-16 17:21:28 +0200 |
|---|---|---|
| committer | Radim Krčmář <rkrcmar@redhat.com> | 2018-05-26 14:14:33 +0200 |
| commit | 7053df4edb3ae3ae15c316fe49122c0b3936e9dd (patch) | |
| tree | b57f7743e75d77240fd3d655324c13b9ac7ab68f /virt | |
| parent | KVM: x86: hyperv: do rep check for each hypercall separately (diff) | |
| download | linux-7053df4edb3ae3ae15c316fe49122c0b3936e9dd.tar.xz linux-7053df4edb3ae3ae15c316fe49122c0b3936e9dd.zip | |
KVM: introduce kvm_make_vcpus_request_mask() API
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 <vkuznets@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/kvm_main.c | 34 |
1 files changed, 26 insertions, 8 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index c7b2e927f699..b125d94307d2 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -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; } |