From: Paolo Bonzini <pbonzini@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH v2 00/38] Delay destruction of memory regions to instance_finalize
Date: Tue, 17 Sep 2013 19:16:15 +0200 [thread overview]
Message-ID: <52388E5F.6020802@redhat.com> (raw)
In-Reply-To: <20130917170752.GA20986@redhat.com>
Il 17/09/2013 19:07, Michael S. Tsirkin ha scritto:
> After memory_region_del_subregion returns,
> it's a promise that there will not be accesses
> to the region.
It's racy anyway. You can have memory_region_del_subregion happen one
clock cycle after the other (physical) CPU has done checked that there
will not be accesses to the region.
A real bus has a "big PCI lock" (there can be only one transaction at a
time), which is exactly what we want to get rid of.
> So I'm not even sure we really need to move destroy to finalize anymore ...
We definitely need to move it. Even if we added a flag that we set in
memory_region_del_subregion, we need to check it later when AIO completes.
Paolo
next prev parent reply other threads:[~2013-09-17 17:16 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-03 12:32 [Qemu-devel] [PATCH v2 00/38] Delay destruction of memory regions to instance_finalize Paolo Bonzini
2013-09-03 12:32 ` [Qemu-devel] [PATCH 01/38] qdev: document assumption that unrealize is followed by finalize Paolo Bonzini
2013-09-17 9:00 ` Michael S. Tsirkin
2013-09-03 12:32 ` [Qemu-devel] [PATCH 02/38] pci: split exit and finalize Paolo Bonzini
2013-09-17 9:16 ` Michael S. Tsirkin
2013-09-17 9:56 ` Paolo Bonzini
2013-09-17 10:23 ` Paolo Bonzini
2013-09-17 10:06 ` Michael S. Tsirkin
2013-09-03 12:32 ` [Qemu-devel] [PATCH 03/38] ac97: use instance_finalize instead of exit Paolo Bonzini
2013-09-03 12:32 ` [Qemu-devel] [PATCH 04/38] es1370: " Paolo Bonzini
2013-09-03 12:32 ` [Qemu-devel] [PATCH 05/38] hda: reclaim memory in " Paolo Bonzini
2013-09-03 12:32 ` [Qemu-devel] [PATCH 06/38] serial: " Paolo Bonzini
2013-09-03 12:32 ` [Qemu-devel] [PATCH 07/38] tpci200: use " Paolo Bonzini
2013-09-03 12:32 ` [Qemu-devel] [PATCH 08/38] pci-assign: reclaim memory in " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 09/38] ahci: " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 10/38] msix: split msix_free from msix_uninit Paolo Bonzini
2013-09-17 9:21 ` Michael S. Tsirkin
2013-09-17 9:56 ` Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 11/38] cmd646: use instance_finalize instead of exit Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 12/38] ide/piix: " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 13/38] ide/via: " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 14/38] ivshmem: reclaim memory in " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 15/38] pci-testdev: use " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 16/38] vfio: reclaim memory in " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 17/38] e1000: use " Paolo Bonzini
2013-09-17 9:27 ` Michael S. Tsirkin
2013-09-17 10:13 ` Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 18/38] eepro100: " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 19/38] ne2000: " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 20/38] pcnet: " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 21/38] rtl8139: " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 22/38] vmxnet3: reclaim memory in " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 23/38] shpc: split shpc_free from shpc_cleanup Paolo Bonzini
2013-09-17 9:24 ` Michael S. Tsirkin
2013-09-17 9:58 ` Paolo Bonzini
2013-09-17 10:03 ` Michael S. Tsirkin
2013-09-03 12:33 ` [Qemu-devel] [PATCH 24/38] pci_bridge: split pci_bridge_free from pci_bridge_exitfn Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 25/38] pcie_aer: pcie_aer_exit really frees stuff Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 26/38] pci_bridge: reclaim memory in instance_finalize instead of exit Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 27/38] ioh4320: " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 28/38] xio3130-downstream: " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 29/38] xio3130-upstream: " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 30/38] pcie: do not recreate mmcfg I/O region, use an alias instead Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 31/38] esp: use instance_finalize instead of exit Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 32/38] lsi: " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 33/38] pvscsi: reclaim memory in " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 34/38] usb-uhci: use " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 35/38] virtio-pci: reclaim memory in " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 36/38] wdt_i6300esb: use " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 37/38] xen_pt: reclaim memory in " Paolo Bonzini
2013-09-03 12:33 ` [Qemu-devel] [PATCH 38/38] tpm: move add/del_subregion to realize/unrealize Paolo Bonzini
2013-09-16 16:35 ` [Qemu-devel] [PATCH v2 00/38] Delay destruction of memory regions to instance_finalize Paolo Bonzini
2013-09-17 6:44 ` Wenchao Xia
2013-09-17 10:01 ` Paolo Bonzini
2013-09-20 6:16 ` Wenchao Xia
2013-09-17 9:31 ` Michael S. Tsirkin
2013-09-17 12:47 ` Michael S. Tsirkin
2013-09-17 14:41 ` Paolo Bonzini
2013-09-17 14:45 ` Michael S. Tsirkin
2013-09-17 15:41 ` Paolo Bonzini
2013-09-17 15:59 ` Michael S. Tsirkin
2013-09-17 16:13 ` Paolo Bonzini
2013-09-17 16:29 ` Michael S. Tsirkin
2013-09-17 16:58 ` Paolo Bonzini
2013-09-17 17:07 ` Michael S. Tsirkin
2013-09-17 17:16 ` Paolo Bonzini [this message]
2013-09-17 17:26 ` Michael S. Tsirkin
2013-09-17 19:07 ` Paolo Bonzini
2013-09-17 19:51 ` Michael S. Tsirkin
2013-09-17 22:02 ` Paolo Bonzini
2013-09-18 5:48 ` Michael S. Tsirkin
2013-09-18 7:40 ` Paolo Bonzini
2013-09-18 8:41 ` Michael S. Tsirkin
2013-09-18 11:26 ` Paolo Bonzini
2013-09-18 11:56 ` Peter Maydell
2013-09-18 13:11 ` Paolo Bonzini
2013-09-18 13:19 ` Peter Maydell
2013-09-18 13:28 ` Paolo Bonzini
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