From 4dcd885d5308e34fb4550c20fc7ffc050e014c91 Mon Sep 17 00:00:00 2001 From: Laurent Vivier Date: Mon, 27 Nov 2017 09:03:20 +0100 Subject: [PATCH 6/7] spapr: reset DRCs after devices RH-Author: Laurent Vivier Message-id: <20171127090320.32307-1-lvivier@redhat.com> Patchwork-id: 77902 O-Subject: [RHV7.5 qemu-kvm-rhev PATCH] spapr: reset DRCs after devices Bugzilla: 1516145 RH-Acked-by: Serhii Popovych RH-Acked-by: David Gibson RH-Acked-by: Miroslav Rezanina RH-Acked-by: Thomas Huth From: Greg Kurz A DRC with a pending unplug request releases its associated device at machine reset time. In the case of LMB, when all DRCs for a DIMM device have been reset, the DIMM gets unplugged, causing guest memory to disappear. This may be very confusing for anything still using this memory. This is exactly what happens with vhost backends, and QEMU aborts with: qemu-system-ppc64: used ring relocated for ring 2 qemu-system-ppc64: qemu/hw/virtio/vhost.c:649: vhost_commit: Assertion `r >= 0' failed. The issue is that each DRC registers a QEMU reset handler, and we don't control the order in which these handlers are called (ie, a LMB DRC will unplug a DIMM before the virtio device using the memory on this DIMM could stop its vhost backend). To avoid such situations, let's reset DRCs after all devices have been reset. Reported-by: Mallesh N. Koti Signed-off-by: Greg Kurz Reviewed-by: Daniel Henrique Barboza Reviewed-by: Michael Roth Signed-off-by: David Gibson (cherry picked from commit 82512483940c756e2db1bd67ea91b02bc29c5e01) Signed-off-by: Laurent Vivier Signed-off-by: Miroslav Rezanina --- hw/ppc/spapr.c | 21 +++++++++++++++++++++ hw/ppc/spapr_drc.c | 7 ------- 2 files changed, 21 insertions(+), 7 deletions(-) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index 2065f09..6c64c55 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -1394,6 +1394,19 @@ static void find_unknown_sysbus_device(SysBusDevice *sbdev, void *opaque) } } +static int spapr_reset_drcs(Object *child, void *opaque) +{ + sPAPRDRConnector *drc = + (sPAPRDRConnector *) object_dynamic_cast(child, + TYPE_SPAPR_DR_CONNECTOR); + + if (drc) { + spapr_drc_reset(drc); + } + + return 0; +} + static void ppc_spapr_reset(void) { MachineState *machine = MACHINE(qdev_get_machine()); @@ -1417,6 +1430,14 @@ static void ppc_spapr_reset(void) } qemu_devices_reset(); + + /* DRC reset may cause a device to be unplugged. This will cause troubles + * if this device is used by another device (eg, a running vhost backend + * will crash QEMU if the DIMM holding the vring goes away). To avoid such + * situations, we reset DRCs after all devices have been reset. + */ + object_child_foreach_recursive(object_get_root(), spapr_reset_drcs, NULL); + spapr_clear_pending_events(spapr); /* diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c index 85c999d..7d33e4c 100644 --- a/hw/ppc/spapr_drc.c +++ b/hw/ppc/spapr_drc.c @@ -455,11 +455,6 @@ void spapr_drc_reset(sPAPRDRConnector *drc) } } -static void drc_reset(void *opaque) -{ - spapr_drc_reset(SPAPR_DR_CONNECTOR(opaque)); -} - bool spapr_drc_needed(void *opaque) { sPAPRDRConnector *drc = (sPAPRDRConnector *)opaque; @@ -517,7 +512,6 @@ static void realize(DeviceState *d, Error **errp) } vmstate_register(DEVICE(drc), spapr_drc_index(drc), &vmstate_spapr_drc, drc); - qemu_register_reset(drc_reset, drc); trace_spapr_drc_realize_complete(spapr_drc_index(drc)); } @@ -528,7 +522,6 @@ static void unrealize(DeviceState *d, Error **errp) char name[256]; trace_spapr_drc_unrealize(spapr_drc_index(drc)); - qemu_unregister_reset(drc_reset, drc); vmstate_unregister(DEVICE(drc), &vmstate_spapr_drc, drc); root_container = container_get(object_get_root(), DRC_CONTAINER_PATH); snprintf(name, sizeof(name), "%x", spapr_drc_index(drc)); -- 1.8.3.1