From e806b4db1477a1c6bfda7bba28c7f26c47f18e1e Mon Sep 17 00:00:00 2001 From: Laurent Vivier Date: Wed, 28 Jun 2017 16:09:19 +0200 Subject: spapr: fix migration to pseries machine < 2.8 since commit 5c4537bd ("spapr: Fix 2.7<->2.8 migration of PCI host bridge"), some migration fields are forged from the new ones in spapr_pci_pre_save(). It works well, except when the number of MSI devices is 0, because in this case the function exits immediately. This fix moves the migration code before the exit code. The problem can be reproduced with these commands: source qemu-2.9: qemu-system-ppc64 -monitor stdio -M pseries-2.6 -nodefaults -S destination qemu-2.6: qemu-system-ppc64 -monitor stdio -M pseries-2.6 -nodefaults \ -incoming tcp:0:4444 on the source: migrate tcp:localhost:4444 Destination fails with the following error: qemu-system-ppc64: error while loading state for instance 0x0 of device 'spapr_pci' qemu-system-ppc64: load of migration failed: Invalid argument Signed-off-by: Laurent Vivier Reviewed-by: Greg Kurz Signed-off-by: David Gibson --- hw/ppc/spapr_pci.c | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-) diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c index 3b37dcdc09..f09b4e1311 100644 --- a/hw/ppc/spapr_pci.c +++ b/hw/ppc/spapr_pci.c @@ -1873,20 +1873,6 @@ static void spapr_pci_pre_save(void *opaque) gpointer key, value; int i; - g_free(sphb->msi_devs); - sphb->msi_devs = NULL; - sphb->msi_devs_num = g_hash_table_size(sphb->msi); - if (!sphb->msi_devs_num) { - return; - } - sphb->msi_devs = g_malloc(sphb->msi_devs_num * sizeof(spapr_pci_msi_mig)); - - g_hash_table_iter_init(&iter, sphb->msi); - for (i = 0; g_hash_table_iter_next(&iter, &key, &value); ++i) { - sphb->msi_devs[i].key = *(uint32_t *) key; - sphb->msi_devs[i].value = *(spapr_pci_msi *) value; - } - if (sphb->pre_2_8_migration) { sphb->mig_liobn = sphb->dma_liobn[0]; sphb->mig_mem_win_addr = sphb->mem_win_addr; @@ -1900,6 +1886,20 @@ static void spapr_pci_pre_save(void *opaque) sphb->mig_mem_win_size += sphb->mem64_win_size; } } + + g_free(sphb->msi_devs); + sphb->msi_devs = NULL; + sphb->msi_devs_num = g_hash_table_size(sphb->msi); + if (!sphb->msi_devs_num) { + return; + } + sphb->msi_devs = g_malloc(sphb->msi_devs_num * sizeof(spapr_pci_msi_mig)); + + g_hash_table_iter_init(&iter, sphb->msi); + for (i = 0; g_hash_table_iter_next(&iter, &key, &value); ++i) { + sphb->msi_devs[i].key = *(uint32_t *) key; + sphb->msi_devs[i].value = *(spapr_pci_msi *) value; + } } static int spapr_pci_post_load(void *opaque, int version_id) -- cgit v1.2.1