From: Jan Kiszka Date: Tue, 16 Nov 2010 21:30:05 +0000 (+0100) Subject: KVM: Save/restore state of assigned PCI device X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ed78661f2614d3c9f69c23e280db3bafdabdf5bb;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git KVM: Save/restore state of assigned PCI device The guest may change states that pci_reset_function does not touch. So we better save/restore the assigned device across guest usage. Acked-by: Alex Williamson Acked-by: Michael S. Tsirkin Signed-off-by: Jan Kiszka Signed-off-by: Marcelo Tosatti --- diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c index 7623408dbc81..d3892076f93c 100644 --- a/virt/kvm/assigned-dev.c +++ b/virt/kvm/assigned-dev.c @@ -197,7 +197,8 @@ static void kvm_free_assigned_device(struct kvm *kvm, { kvm_free_assigned_irq(kvm, assigned_dev); - pci_reset_function(assigned_dev->dev); + __pci_reset_function(assigned_dev->dev); + pci_restore_state(assigned_dev->dev); pci_release_regions(assigned_dev->dev); pci_disable_device(assigned_dev->dev); @@ -514,6 +515,7 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm, } pci_reset_function(dev); + pci_save_state(dev); match->assigned_dev_id = assigned_dev->assigned_dev_id; match->host_segnr = assigned_dev->segnr; @@ -544,6 +546,7 @@ out: mutex_unlock(&kvm->lock); return r; out_list_del: + pci_restore_state(dev); list_del(&match->list); pci_release_regions(dev); out_disable: