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From 56e7f4a46b448ec40f72272658296df226ff0b5a Mon Sep 17 00:00:00 2001
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From: Alex Williamson <alex.williamson@redhat.com>
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Date: Thu, 13 Dec 2018 21:55:20 +0100
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Subject: [PATCH 4/5] kvm: Use inhibit to prevent ballooning without
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synchronous mmu
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RH-Author: Alex Williamson <alex.williamson@redhat.com>
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Message-id: <154473812068.22725.2716400707312373292.stgit@gimli.home>
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Patchwork-id: 83496
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O-Subject: [RHEL-7.7 qemu-kvm PATCH 4/5] kvm: Use inhibit to prevent ballooning without synchronous mmu
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Bugzilla: 1659229
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Auger Eric <eric.auger@redhat.com>
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Bugzilla: 1659229
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Remove KVM specific tests in balloon_page(), instead marking
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ballooning as inhibited without KVM_CAP_SYNC_MMU support.
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Reviewed-by: David Hildenbrand <david@redhat.com>
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Reviewed-by: Peter Xu <peterx@redhat.com>
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Reviewed-by: Cornelia Huck <cohuck@redhat.com>
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Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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(cherry picked from commit f59489423ab79852e98d9b3025b7d99ba8da584f)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/virtio/virtio-balloon.c | 4 +---
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kvm-all.c | 4 ++++
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2 files changed, 5 insertions(+), 3 deletions(-)
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diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c
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index c9562ef..d8add23 100644
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--- a/hw/virtio/virtio-balloon.c
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+++ b/hw/virtio/virtio-balloon.c
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@@ -21,7 +21,6 @@
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#include "cpu.h"
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#include "sysemu/balloon.h"
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#include "hw/virtio/virtio-balloon.h"
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-#include "sysemu/kvm.h"
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#include "exec/address-spaces.h"
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#include "qapi/visitor.h"
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@@ -34,8 +33,7 @@
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static void balloon_page(void *addr, int deflate)
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{
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#if defined(__linux__)
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- if (!qemu_balloon_is_inhibited() && (!kvm_enabled() ||
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- kvm_has_sync_mmu())) {
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+ if (!qemu_balloon_is_inhibited()) {
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qemu_madvise(addr, TARGET_PAGE_SIZE,
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deflate ? QEMU_MADV_WILLNEED : QEMU_MADV_DONTNEED);
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}
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diff --git a/kvm-all.c b/kvm-all.c
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index f5b7958..572275e 100644
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--- a/kvm-all.c
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+++ b/kvm-all.c
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@@ -17,6 +17,7 @@
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <stdarg.h>
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+#include "sysemu/balloon.h"
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#include <linux/kvm.h>
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@@ -1481,6 +1482,9 @@ int kvm_init(void)
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cpu_interrupt_handler = kvm_handle_interrupt;
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s->sync_mmu = !!kvm_check_extension(kvm_state, KVM_CAP_SYNC_MMU);
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+ if (!s->sync_mmu) {
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+ qemu_balloon_inhibit(true);
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+ }
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return 0;
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--
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1.8.3.1
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