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Re: [libvirt] [PATCHv2] qemu: Do fake auto-allocation of ports when generating native command



On 05/06/13 19:09, Eric Blake wrote:
On 05/02/2013 03:16 AM, Peter Krempa wrote:
When attempting to generate the native command line from an XML file
that uses graphics port auto allocation, the generated commandline
wouldn't be valid.

This patch adds fake autoallocation of ports as done when starting the
actual machine.
---

Notes:
     Version 2:
     - rebased after context-conflict with 11fc1beab6e018a88182f80056d35217c150b3de

  src/qemu/qemu_driver.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++
  1 file changed, 52 insertions(+)

ACK.


diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 9492850..45fcf05 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -5274,6 +5274,58 @@ static char *qemuConnectDomainXMLToNative(virConnectPtr conn,
      if (qemuDomainAssignAddresses(def, qemuCaps, NULL) < 0)
          goto cleanup;

+    /* do fake auto-alloc of graphics ports, if such config is used */
+    for (i = 0 ; i < def->ngraphics; ++i) {
+        virDomainGraphicsDefPtr graphics = def->graphics[i];
+        if (graphics->type == VIR_DOMAIN_GRAPHICS_TYPE_VNC &&
+            !graphics->data.vnc.socket && graphics->data.vnc.autoport) {
+            graphics->data.vnc.port = 5900;

I don't know if using QEMU_REMOTE_PORT_MIN instead of hard-coding the
magic number is any better, but we already discussed that for purposes
of command-line generation, ANY port number will do, so it doesn't
really invalidate your patch.


Thanks for the reviews. This patch is now pushed. As this is a fix that we generate a valid commandline for qemu, when somebody tries to use the domxml-to-native command/API I don't think it's necessary to spend more time on it. I was considering if it's even worth doing this at all. I decided that we should do it this way, as nobody can expect that autoallocation should work outside of libvirt's control.

Peter


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