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Add virtio-balloon support

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This adds a VirtIO based balloon driver.  It uses madvise() to actually balloon
the memory when possible.

Until 2.6.27, KVM forced memory pinning so we must disable ballooning unless the
kernel actually supports it when using KVM.  It's always safe when using TCG.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5874 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2008-12-04 20:33:06 +00:00
parent df751fa8bf
commit bd3220870f
7 changed files with 261 additions and 3 deletions
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4
monitor.c
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@ -1402,7 +1402,9 @@ static void do_info_balloon(void)
ram_addr_t actual;
actual = qemu_balloon_status();
if (actual == 0)
if (kvm_enabled() && !kvm_has_sync_mmu())
term_printf("Using KVM without synchronous MMU, ballooning disabled\n");
else if (actual == 0)
term_printf("Ballooning not activated in VM\n");
else
term_printf("balloon: actual=%d\n", (int)(actual >> 20));