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Commit 7053df4e authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Radim Krčmář
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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: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
parent 56b9ae78

include/linux/kvm_host.h

+3 −0
Original line number Diff line number Diff line
@@ -730,6 +730,9 @@ void kvm_put_guest_fpu(struct kvm_vcpu *vcpu); 


void kvm_flush_remote_tlbs(struct kvm *kvm);

void kvm_reload_remote_mmus(struct kvm *kvm);



bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,

				 unsigned long *vcpu_bitmap, cpumask_var_t tmp);

bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req);



long kvm_arch_dev_ioctl(struct file *filp,

virt/kvm/kvm_main.c

+26 −8
Original line number Diff line number Diff line
@@ -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;

}