* [Qemu-devel] [PATCH v3] virtio-pci: error out when both legacy and modern modes are disabled
@ 2016-07-21 17:43 Greg Kurz
2016-07-21 18:11 ` Marcel Apfelbaum
2016-07-21 20:07 ` Eric Blake
0 siblings, 2 replies; 3+ messages in thread
From: Greg Kurz @ 2016-07-21 17:43 UTC (permalink / raw)
To: Michael S. Tsirkin; +Cc: Cornelia Huck, qemu-devel, Marcel Apfelbaum
From: Greg Kurz <gkurz@linux.vnet.ibm.com>
Without presuming if we got there because of a user mistake or some
more subtle bug in the tooling, it really does not make sense to
implement a non-functional device.
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Greg Kurz <groug@kaod.org>
---
v3: - rebased on top of:
https://lists.gnu.org/archive/html/qemu-devel/2016-07/msg04744.html
- use virtio_pci_legacy/modern helpers
- rephrased error message to be shorter and use the on/off logic
Marcel, this still results in > 80 char line in the code but I'd rather not
split it to ease grepping, nor shorten the message even more to keep it
meaningful.
---
hw/virtio/virtio-pci.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 755f9218b77d..1f5f00a50a0b 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1842,6 +1842,11 @@ static void virtio_pci_dc_realize(DeviceState *qdev, Error **errp)
VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
PCIDevice *pci_dev = &proxy->pci_dev;
+ if (!(virtio_pci_modern(proxy) || virtio_pci_legacy(proxy))) {
+ error_setg(errp, "device cannot work when both disable-modern and disable-legacy are set to on.");
+ return;
+ }
+
if (!(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_PCIE) &&
virtio_pci_modern(proxy)) {
pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [PATCH v3] virtio-pci: error out when both legacy and modern modes are disabled
2016-07-21 17:43 [Qemu-devel] [PATCH v3] virtio-pci: error out when both legacy and modern modes are disabled Greg Kurz
@ 2016-07-21 18:11 ` Marcel Apfelbaum
2016-07-21 20:07 ` Eric Blake
1 sibling, 0 replies; 3+ messages in thread
From: Marcel Apfelbaum @ 2016-07-21 18:11 UTC (permalink / raw)
To: Greg Kurz, Michael S. Tsirkin; +Cc: Cornelia Huck, qemu-devel
On 07/21/2016 08:43 PM, Greg Kurz wrote:
> From: Greg Kurz <gkurz@linux.vnet.ibm.com>
>
> Without presuming if we got there because of a user mistake or some
> more subtle bug in the tooling, it really does not make sense to
> implement a non-functional device.
>
> Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
> Signed-off-by: Greg Kurz <groug@kaod.org>
> ---
> v3: - rebased on top of:
> https://lists.gnu.org/archive/html/qemu-devel/2016-07/msg04744.html
> - use virtio_pci_legacy/modern helpers
> - rephrased error message to be shorter and use the on/off logic
>
> Marcel, this still results in > 80 char line in the code but I'd rather not
> split it to ease grepping, nor shorten the message even more to keep it
> meaningful.
> ---
> hw/virtio/virtio-pci.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> index 755f9218b77d..1f5f00a50a0b 100644
> --- a/hw/virtio/virtio-pci.c
> +++ b/hw/virtio/virtio-pci.c
> @@ -1842,6 +1842,11 @@ static void virtio_pci_dc_realize(DeviceState *qdev, Error **errp)
> VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
> PCIDevice *pci_dev = &proxy->pci_dev;
>
> + if (!(virtio_pci_modern(proxy) || virtio_pci_legacy(proxy))) {
Hi Greg,
Thanks for rebasing it.
A minor thing, disable-legacy is now auto/on/off.
If the user sets [disable-legacy=auto, disable-modern=on]
will not pass this test, but is possible that later on
will be enabled:
See virtio_pci_realize:
if (proxy->disable_legacy == ON_OFF_AUTO_AUTO) {
proxy->disable_legacy = pcie_port ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
}
On the the other hand, if the user sets disable-modern=on, is reasonable to ask
him to set disable-legacy to off.
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Thanks,
Marcel
> + error_setg(errp, "device cannot work when both disable-modern and disable-legacy are set to on.");
> + return;
> + }
> +
> if (!(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_PCIE) &&
> virtio_pci_modern(proxy)) {
> pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [PATCH v3] virtio-pci: error out when both legacy and modern modes are disabled
2016-07-21 17:43 [Qemu-devel] [PATCH v3] virtio-pci: error out when both legacy and modern modes are disabled Greg Kurz
2016-07-21 18:11 ` Marcel Apfelbaum
@ 2016-07-21 20:07 ` Eric Blake
1 sibling, 0 replies; 3+ messages in thread
From: Eric Blake @ 2016-07-21 20:07 UTC (permalink / raw)
To: Greg Kurz, Michael S. Tsirkin; +Cc: Cornelia Huck, qemu-devel, Marcel Apfelbaum
[-- Attachment #1: Type: text/plain, Size: 1718 bytes --]
On 07/21/2016 11:43 AM, Greg Kurz wrote:
> From: Greg Kurz <gkurz@linux.vnet.ibm.com>
>
> Without presuming if we got there because of a user mistake or some
> more subtle bug in the tooling, it really does not make sense to
> implement a non-functional device.
>
> Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
> Signed-off-by: Greg Kurz <groug@kaod.org>
> ---
> v3: - rebased on top of:
> https://lists.gnu.org/archive/html/qemu-devel/2016-07/msg04744.html
> - use virtio_pci_legacy/modern helpers
> - rephrased error message to be shorter and use the on/off logic
>
> Marcel, this still results in > 80 char line in the code but I'd rather not
> split it to ease grepping, nor shorten the message even more to keep it
> meaningful.
> ---
> hw/virtio/virtio-pci.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> index 755f9218b77d..1f5f00a50a0b 100644
> --- a/hw/virtio/virtio-pci.c
> +++ b/hw/virtio/virtio-pci.c
> @@ -1842,6 +1842,11 @@ static void virtio_pci_dc_realize(DeviceState *qdev, Error **errp)
> VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
> PCIDevice *pci_dev = &proxy->pci_dev;
>
> + if (!(virtio_pci_modern(proxy) || virtio_pci_legacy(proxy))) {
> + error_setg(errp, "device cannot work when both disable-modern and disable-legacy are set to on.");
The phrase passed to error_setg() should not end in '.'
You can also split the string literal, to keep the line length of the
source under 80 (the long error message is less problematic).
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2016-07-21 17:43 [Qemu-devel] [PATCH v3] virtio-pci: error out when both legacy and modern modes are disabled Greg Kurz
2016-07-21 18:11 ` Marcel Apfelbaum
2016-07-21 20:07 ` Eric Blake
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