From 44943efe8465f60315d3fb54a935d1ea190ee4fb Mon Sep 17 00:00:00 2001
From: Michal Privoznik <mprivozn@redhat.com>
Date: Tue, 8 Sep 2020 17:42:09 +0200
Subject: [PATCH 026/108] qemuFirmwareFillDomain: Fill NVRAM template on
 migration too

In 8e1804f9f66 I've tried to fix the following use case: domain
is started with path to UEFI only and relies on libvirt to figure
out corresponding NVRAM template to create a per-domain copy
from. The fix consisted of having a check tailored exactly for
this use case and if it's hit then using FW autoselection to
figure it out. Unfortunately, the NVRAM template is not saved in
the inactive XML (well, the domain might be transient anyway).
Then, as a part of that check we see whether the per-domain copy
doesn't exist already and if it does then no template is looked
up hence no template will appear in the live XML.

This works, until the domain is migrated. At the destination, the
per-domain copy will not exist so we need to know the template to
create the per-domain copy from. But we don't even get to the
check because we are not starting a fresh new domain and thus the
qemuFirmwareFillDomain() function quits early.

The solution is to switch order of these two checks. That is
evaluate the check for the old style before checking flags.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1852910
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
(cherry picked from commit c43622f06e295edcb9cedf33583f0bd18fb04b10)
---
 src/qemu/qemu_firmware.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/qemu/qemu_firmware.c b/src/qemu/qemu_firmware.c
index bd251c05fc..0d2439bba1 100644
--- a/src/qemu/qemu_firmware.c
+++ b/src/qemu/qemu_firmware.c
@@ -1229,9 +1229,6 @@ qemuFirmwareFillDomain(virQEMUDriverPtr driver,
     size_t i;
     int ret = -1;
 
-    if (!(flags & VIR_QEMU_PROCESS_START_NEW))
-        return 0;
-
     /* Fill in FW paths if either os.firmware is enabled, or
      * loader path was provided with no nvram varstore. */
     if (def->os.firmware == VIR_DOMAIN_OS_DEF_FIRMWARE_NONE) {
@@ -1247,6 +1244,11 @@ qemuFirmwareFillDomain(virQEMUDriverPtr driver,
         /* ... then we want to consult JSON FW descriptors first,
          * but we don't want to fail if we haven't found a match. */
         needResult = false;
+    } else {
+        /* Domain has FW autoselection enabled => do nothing if
+         * we are not starting it from scratch. */
+        if (!(flags & VIR_QEMU_PROCESS_START_NEW))
+            return 0;
     }
 
     if ((nfirmwares = qemuFirmwareFetchParsedConfigs(driver->privileged,
-- 
2.33.0