Commit 27406cd5 authored by Christian Borntraeger's avatar Christian Borntraeger
Browse files

KVM: s390: provide functions for blocking all CPUs 



Some updates to the control blocks need to be done in a way that
ensures that no CPU is within SIE. Provide wrappers around the
s390_vcpu_block functions and adopt the TOD migration code to
update in a guaranteed fashion. Also rename these functions to
have the kvm_s390_ prefix as everything else.

Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: default avatarDavid Hildenbrand <dahi@linux.vnet.ibm.com>
parent 8e236546

arch/s390/kvm/kvm-s390.c

+5 −5
Original line number Diff line number Diff line
@@ -454,10 +454,10 @@ static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) 


	mutex_lock(&kvm->lock);

	kvm->arch.epoch = gtod - host_tod;

	kvm_for_each_vcpu(vcpu_idx, cur_vcpu, kvm) {

	kvm_s390_vcpu_block_all(kvm);

	kvm_for_each_vcpu(vcpu_idx, cur_vcpu, kvm)

		cur_vcpu->arch.sie_block->epoch = kvm->arch.epoch;

		exit_sie(cur_vcpu);

	}

	kvm_s390_vcpu_unblock_all(kvm);

	mutex_unlock(&kvm->lock);

	return 0;

}
@@ -1414,12 +1414,12 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) 
	return kvm_s390_vcpu_has_irq(vcpu, 0);

}



void s390_vcpu_block(struct kvm_vcpu *vcpu)

void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)

{

	atomic_set_mask(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);

}



void s390_vcpu_unblock(struct kvm_vcpu *vcpu)

void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu)

{

	atomic_clear_mask(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);

}

arch/s390/kvm/kvm-s390.h

+21 −2
Original line number Diff line number Diff line
@@ -211,8 +211,8 @@ int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr); 
int kvm_s390_vcpu_store_adtl_status(struct kvm_vcpu *vcpu, unsigned long addr);

void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu);

void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu);

void s390_vcpu_block(struct kvm_vcpu *vcpu);

void s390_vcpu_unblock(struct kvm_vcpu *vcpu);

void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu);

void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu);

void exit_sie(struct kvm_vcpu *vcpu);

void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu);

int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu);
@@ -228,6 +228,25 @@ int kvm_s390_handle_diag(struct kvm_vcpu *vcpu); 
int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,

			     struct kvm_s390_pgm_info *pgm_info);



static inline void kvm_s390_vcpu_block_all(struct kvm *kvm)

{

	int i;

	struct kvm_vcpu *vcpu;



	WARN_ON(!mutex_is_locked(&kvm->lock));

	kvm_for_each_vcpu(i, vcpu, kvm)

		kvm_s390_vcpu_block(vcpu);

}



static inline void kvm_s390_vcpu_unblock_all(struct kvm *kvm)

{

	int i;

	struct kvm_vcpu *vcpu;



	kvm_for_each_vcpu(i, vcpu, kvm)

		kvm_s390_vcpu_unblock(vcpu);

}



/**

 * kvm_s390_inject_prog_cond - conditionally inject a program check

 * @vcpu: virtual cpu

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