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qemu: preserve error on bandwidth rollback

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We call APIs that reset the error in the rollback code.
Preserve the error from the original call that failed.

This turns the boringly cryptic:
  error: Unable to set interface parameters
  error: An error occurred, but the cause is unknown
to the unexpectedly anarchist:
  error: internal error: Child process (/usr/sbin/tc filter add
  dev vnet1 parent ffff: protocol all u32 match u32 0 0 police
  rate 4294968kbps burst 4294968kb mtu 64kb drop flowid :1)
  unexpected exit status 1: Illegal "rate"
  Illegal "police"

Signed-off-by: Ján Tomko <jtomko@redhat.com>
Fixes: f02e21cb33
https://bugzilla.redhat.com/show_bug.cgi?id=1800505
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Ján Tomko 2020-02-07 12:40:51 +01:00
parent bd622e2a21
commit 457b0e7488
1 changed files with 4 additions and 0 deletions
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4
src/qemu/qemu_driver.c
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@ -11678,6 +11678,9 @@ qemuDomainSetInterfaceParameters(virDomainPtr dom,
if (virNetDevBandwidthSet(net->ifname, newBandwidth, false,
!virDomainNetTypeSharesHostView(net)) < 0) {
virErrorPtr orig_err;
virErrorPreserveLast(&orig_err);
ignore_value(virNetDevBandwidthSet(net->ifname,
net->bandwidth,
false,
@ -11686,6 +11689,7 @@ qemuDomainSetInterfaceParameters(virDomainPtr dom,
ignore_value(virDomainNetBandwidthUpdate(net,
net->bandwidth));
}
virErrorRestore(&orig_err);
goto endjob;
}