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spapr: use DEVICE_UNPLUG_GUEST_ERROR to report unplug errors 

Linux Kernel 5.12 is now unisolating CPU DRCs in the device_removal
error path, signalling that the hotunplug process wasn't successful.
This allow us to send a DEVICE_UNPLUG_GUEST_ERROR in drc_unisolate_logical()
to signal this error to the management layer.

We also have another error path in spapr_memory_unplug_rollback() for
configured LMB DRCs. Kernels older than 5.13 will not unisolate the LMBs
in the hotunplug error path, but it will reconfigure them. Let's send
the DEVICE_UNPLUG_GUEST_ERROR event in that code path as well to cover the
case of older kernels.

Acked-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20210907004755.424931-7-danielhb413@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
master
Daniel Henrique Barboza 2021-09-06 21:47:54 -03:00 committed by David Gibson
parent d43f1670c7
commit 4b08cd567b
2 changed files with 14 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
hw/ppc/spapr.c
View File

@ -29,6 +29,7 @@
#include "qemu/datadir.h"
#include "qapi/error.h"
#include "qapi/qapi-events-machine.h"
#include "qapi/qapi-events-qdev.h"
#include "qapi/visitor.h"
#include "sysemu/sysemu.h"
#include "sysemu/hostmem.h"
@ -3686,11 +3687,18 @@ void spapr_memory_unplug_rollback(SpaprMachineState *spapr, DeviceState *dev)
/*
* Tell QAPI that something happened and the memory
* hotunplug wasn't successful.
* hotunplug wasn't successful. Keep sending
* MEM_UNPLUG_ERROR even while sending
* DEVICE_UNPLUG_GUEST_ERROR until the deprecation of
* MEM_UNPLUG_ERROR is due.
*/
qapi_error = g_strdup_printf("Memory hotunplug rejected by the guest "
"for device %s", dev->id);
qapi_event_send_mem_unplug_error(dev->id ? : "", qapi_error);
qapi_event_send_device_unplug_guest_error(!!dev->id, dev->id,
dev->canonical_path);
}
/* Callback to be called during DRC release. */

9
hw/ppc/spapr_drc.c
View File

@ -17,6 +17,8 @@
#include "hw/ppc/spapr_drc.h"
#include "qom/object.h"
#include "migration/vmstate.h"
#include "qapi/error.h"
#include "qapi/qapi-events-qdev.h"
#include "qapi/visitor.h"
#include "qemu/error-report.h"
#include "hw/ppc/spapr.h" /* for RTAS return codes */
@ -173,10 +175,9 @@ static uint32_t drc_unisolate_logical(SpaprDrc *drc)
"for device %s", drc->dev->id);
}
/*
* TODO: send a QAPI DEVICE_UNPLUG_ERROR event when
* it is implemented.
*/
qapi_event_send_device_unplug_guest_error(!!drc->dev->id,
drc->dev->id,
drc->dev->canonical_path);
}
return RTAS_OUT_SUCCESS; /* Nothing to do */