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balloon: Allow multiple inhibit users

A simple true/false internal state does not allow multiple users.  Fix
this within the existing interface by converting to a counter, so long
as the counter is elevated, ballooning is inhibited.

Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
tags/v3.1.0-rc0
Alex Williamson 1 year ago
parent
commit
01ccbec7bd
1 changed files with 10 additions and 3 deletions
  1. 10
    3
      balloon.c

+ 10
- 3
balloon.c View File

@@ -26,6 +26,7 @@

#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qemu/atomic.h"
#include "exec/cpu-common.h"
#include "sysemu/kvm.h"
#include "sysemu/balloon.h"
@@ -37,16 +38,22 @@
static QEMUBalloonEvent *balloon_event_fn;
static QEMUBalloonStatus *balloon_stat_fn;
static void *balloon_opaque;
static bool balloon_inhibited;
static int balloon_inhibit_count;

bool qemu_balloon_is_inhibited(void)
{
return balloon_inhibited;
return atomic_read(&balloon_inhibit_count) > 0;
}

void qemu_balloon_inhibit(bool state)
{
balloon_inhibited = state;
if (state) {
atomic_inc(&balloon_inhibit_count);
} else {
atomic_dec(&balloon_inhibit_count);
}

assert(atomic_read(&balloon_inhibit_count) >= 0);
}

static bool have_balloon(Error **errp)

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