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spapr: Don't hijack current_machine->boot_order 

QEMU 6.0 moved all the -boot variables to the machine. Especially, the
removal of the boot_order static changed the handling of '-boot once'
from:

    if (boot_once) {
        qemu_boot_set(boot_once, &error_fatal);
        qemu_register_reset(restore_boot_order, g_strdup(boot_order));
    }

to

    if (current_machine->boot_once) {
        qemu_boot_set(current_machine->boot_once, &error_fatal);
        qemu_register_reset(restore_boot_order,
                            g_strdup(current_machine->boot_order));
    }

This means that we now register as subsequent boot order a copy
of current_machine->boot_once that was just set with the previous
call to qemu_boot_set(), i.e. we never transition away from the
once boot order.

It is certainly fragile^Wwrong for the spapr code to hijack a
field of the base machine type object like that. The boot order
rework simply turned this software boundary violation into an
actual bug.

Have the spapr code to handle that with its own field in
SpaprMachineState. Also kfree() the initial boot device
string when "once" was used.

Fixes: 4b7acd2ac8 ("vl: clean up -boot variables")
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1960119
Cc: pbonzini@redhat.com
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <20210521160735.1901914-1-groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Greg Kurz 2021-05-21 18:07:35 +02:00 committed by David Gibson
parent f2fac71d81
commit 3bf0844f3b
2 changed files with 8 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
hw/ppc/spapr.c
View File

@ -1005,7 +1005,7 @@ static void spapr_dt_chosen(SpaprMachineState *spapr, void *fdt, bool reset)
_FDT(chosen = fdt_add_subnode(fdt, 0, "chosen"));
if (reset) {
const char *boot_device = machine->boot_order;
const char *boot_device = spapr->boot_device;
char *stdout_path = spapr_vio_stdout_path(spapr->vio_bus);
size_t cb = 0;
char *bootlist = get_boot_devices_list(&cb);
@ -2376,8 +2376,10 @@ static SaveVMHandlers savevm_htab_handlers = {
static void spapr_boot_set(void *opaque, const char *boot_device,
Error **errp)
{
MachineState *machine = MACHINE(opaque);
machine->boot_order = g_strdup(boot_device);
SpaprMachineState *spapr = SPAPR_MACHINE(opaque);
g_free(spapr->boot_device);
spapr->boot_device = g_strdup(boot_device);
}
static void spapr_create_lmb_dr_connectors(SpaprMachineState *spapr)

3
include/hw/ppc/spapr.h
View File

@ -223,6 +223,9 @@ struct SpaprMachineState {
int fwnmi_machine_check_interlock;
QemuCond fwnmi_machine_check_interlock_cond;
/* Set by -boot */
char *boot_device;
/*< public >*/
char *kvm_type;
char *host_model;