From: christoffer.dall@linaro.org (Christoffer Dall)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 06/12] KVM: mark kvm->buses as empty once they were destroyed
Date: Sat, 14 Mar 2015 15:43:57 +0100 [thread overview]
Message-ID: <20150314144357.GL10935@cbox> (raw)
In-Reply-To: <1426263012-22935-7-git-send-email-andre.przywara@arm.com>
On Fri, Mar 13, 2015 at 04:10:06PM +0000, Andre Przywara wrote:
> In kvm_destroy_vm() we call kvm_io_bus_destroy() pretty early,
> especially before calling kvm_arch_destroy_vm(). To avoid
> unregistering devices from the already destroyed bus, let's mark
> the bus with NULL to let other users know it has been destroyed
> already.
> This avoids a crash on a VM shutdown with the VGIC using the
> kvm_io_bus later (the unregistering is in there to be able to roll
> back a faulting init).
>
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> ---
> virt/kvm/kvm_main.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 8c7ab0b..6f164eb 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -604,8 +604,10 @@ static void kvm_destroy_vm(struct kvm *kvm)
> list_del(&kvm->vm_list);
> spin_unlock(&kvm_lock);
> kvm_free_irq_routing(kvm);
> - for (i = 0; i < KVM_NR_BUSES; i++)
> + for (i = 0; i < KVM_NR_BUSES; i++) {
> kvm_io_bus_destroy(kvm->buses[i]);
> + kvm->buses[i] = NULL;
> + }
> kvm_coalesced_mmio_free(kvm);
> #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
> mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
this smells a bit like papering over an ordering issue with the
teardown, is there no other way to fix it?
-Christoffer
next prev parent reply other threads:[~2015-03-14 14:43 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-13 16:10 [PATCH 00/12] KVM: arm/arm64: move VGIC MMIO to kvm_io_bus Andre Przywara
2015-03-13 16:10 ` [PATCH 01/12] KVM: Redesign kvm_io_bus_ API to pass VCPU structure to the callbacks Andre Przywara
2015-03-14 14:43 ` Christoffer Dall
2015-03-13 16:10 ` [PATCH 02/12] KVM: move iodev.h from virt/kvm/ to include/kvm Andre Przywara
2015-03-14 14:43 ` Christoffer Dall
2015-03-13 16:10 ` [PATCH 03/12] KVM: arm/arm64: remove now unneeded include directory from Makefile Andre Przywara
2015-03-14 14:43 ` Christoffer Dall
2015-03-13 16:10 ` [PATCH 04/12] KVM: x86: " Andre Przywara
2015-03-14 13:57 ` Christoffer Dall
2015-03-13 16:10 ` [PATCH 05/12] KVM: arm/arm64: rename struct kvm_mmio_range to vgic_io_range Andre Przywara
2015-03-14 14:43 ` Christoffer Dall
2015-03-13 16:10 ` [PATCH 06/12] KVM: mark kvm->buses as empty once they were destroyed Andre Przywara
2015-03-14 14:43 ` Christoffer Dall [this message]
2015-03-13 16:10 ` [PATCH 07/12] KVM: arm/arm64: simplify vgic_find_range() and callers Andre Przywara
2015-03-14 14:44 ` Christoffer Dall
2015-03-13 16:10 ` [PATCH 08/12] KVM: arm/arm64: implement kvm_io_bus MMIO handling for the VGIC Andre Przywara
2015-03-14 14:27 ` Christoffer Dall
2015-03-19 15:44 ` Andre Przywara
2015-03-20 12:40 ` Andre Przywara
2015-03-20 14:25 ` Christoffer Dall
2015-03-20 14:24 ` Christoffer Dall
2015-03-13 16:10 ` [PATCH 09/12] KVM: arm/arm64: prepare GICv2 emulation to be handled by kvm_io_bus Andre Przywara
2015-03-14 14:30 ` Christoffer Dall
2015-03-17 18:02 ` Andre Przywara
2015-03-17 18:51 ` Christoffer Dall
2015-03-13 16:10 ` [PATCH 10/12] KVM: arm/arm64: prepare GICv3 emulation to use kvm_io_bus MMIO handling Andre Przywara
2015-03-14 14:39 ` Christoffer Dall
2015-03-13 16:10 ` [PATCH 11/12] KVM: ARM: on IO mem abort - route the call to KVM MMIO bus Andre Przywara
2015-03-14 14:43 ` Christoffer Dall
2015-03-13 16:10 ` [PATCH 12/12] KVM: arm/arm64: remove now obsolete VGIC specific MMIO handling code Andre Przywara
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