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KVM: x86: add start_assignment hook to kvm_x86_ops

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Add a start_assignment hook to kvm_x86_ops, which is called when
kvm_arch_start_assignment is done.

The hook is required to update the wakeup vector of a sleeping vCPU
when a device is assigned to the guest.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

Message-Id: <20210525134321.254128742@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Marcelo Tosatti 2021-05-25 10:41:16 -03:00 committed by Paolo Bonzini
parent 9805cf03fd
commit 57ab87947a
3 changed files with 4 additions and 1 deletions
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1
arch/x86/include/asm/kvm-x86-ops.h
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@ -99,6 +99,7 @@ KVM_X86_OP_NULL(post_block)
KVM_X86_OP_NULL(vcpu_blocking)
KVM_X86_OP_NULL(vcpu_unblocking)
KVM_X86_OP_NULL(update_pi_irte)
KVM_X86_OP_NULL(start_assignment)
KVM_X86_OP_NULL(apicv_post_state_restore)
KVM_X86_OP_NULL(dy_apicv_has_pending_interrupt)
KVM_X86_OP_NULL(set_hv_timer)

1
arch/x86/include/asm/kvm_host.h
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@ -1352,6 +1352,7 @@ struct kvm_x86_ops {
int (*update_pi_irte)(struct kvm *kvm, unsigned int host_irq,
uint32_t guest_irq, bool set);
void (*start_assignment)(struct kvm *kvm);
void (*apicv_post_state_restore)(struct kvm_vcpu *vcpu);
bool (*dy_apicv_has_pending_interrupt)(struct kvm_vcpu *vcpu);

3
arch/x86/kvm/x86.c
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@ -11504,7 +11504,8 @@ bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu)
void kvm_arch_start_assignment(struct kvm *kvm)
{
atomic_inc(&kvm->arch.assigned_device_count);
if (atomic_inc_return(&kvm->arch.assigned_device_count) == 1)
static_call_cond(kvm_x86_start_assignment)(kvm);
}
EXPORT_SYMBOL_GPL(kvm_arch_start_assignment);