42aeb20e68
Update to v5.0.0 OBS-URL: https://build.opensuse.org/request/show/798748 OBS-URL: https://build.opensuse.org/package/show/Virtualization/qemu?expand=0&rev=547
85 lines
3.1 KiB
Diff
85 lines
3.1 KiB
Diff
From: Janosch Frank <frankja@linux.ibm.com>
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Date: Mon, 24 Feb 2020 07:49:06 -0500
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Subject: s390x: protvirt: Inhibit balloon when switching to protected mode
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References: bsc#1167075
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Ballooning in protected VMs can only be done when the guest shares the
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pages it gives to the host. If pages are not shared, the integrity
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checks will fail once those pages have been altered and are given back
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to the guest.
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As we currently do not yet have a solution for this we will continue
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like this:
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1. We block ballooning now in QEMU (with this patch).
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2. Later we will provide a change to virtio that removes the blocker
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and adds VIRTIO_F_IOMMU_PLATFORM automatically by QEMU when doing the
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protvirt switch. This is OK, as the balloon driver in Linux (the only
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supported guest) will refuse to work with the IOMMU_PLATFORM feature
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bit set.
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3. Later, we can fix the guest balloon driver to accept the IOMMU
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feature bit and correctly exercise sharing and unsharing of balloon
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pages.
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Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
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Reviewed-by: David Hildenbrand <david@redhat.com>
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Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
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Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
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Reviewed-by: Cornelia Huck <cohuck@redhat.com>
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(cherry picked from commit 59dc32a3494d6afdd420f3e401f1f324a1179256)
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Signed-off-by: Bruce Rogers <brogers@suse.com>
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---
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hw/s390x/s390-virtio-ccw.c | 11 +++++++++++
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1 file changed, 11 insertions(+)
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diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
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index e00040a00ba60b20b42ee26a299b..db45249320abf7920ec8730790c2 100644
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--- a/hw/s390x/s390-virtio-ccw.c
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+++ b/hw/s390x/s390-virtio-ccw.c
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@@ -43,6 +43,7 @@
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#include "hw/qdev-properties.h"
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#include "hw/s390x/tod.h"
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#include "sysemu/sysemu.h"
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+#include "sysemu/balloon.h"
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#include "hw/s390x/pv.h"
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#include <linux/kvm.h>
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#include "migration/blocker.h"
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@@ -329,6 +330,7 @@ static void s390_machine_unprotect(S390CcwMachineState *ms)
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ms->pv = false;
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migrate_del_blocker(pv_mig_blocker);
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error_free_or_abort(&pv_mig_blocker);
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+ qemu_balloon_inhibit(false);
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}
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static int s390_machine_protect(S390CcwMachineState *ms)
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@@ -336,10 +338,18 @@ static int s390_machine_protect(S390CcwMachineState *ms)
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Error *local_err = NULL;
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int rc;
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+ /*
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+ * Ballooning on protected VMs needs support in the guest for
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+ * sharing and unsharing balloon pages. Block ballooning for
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+ * now, until we have a solution to make at least Linux guests
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+ * either support it or fail gracefully.
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+ */
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+ qemu_balloon_inhibit(true);
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error_setg(&pv_mig_blocker,
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"protected VMs are currently not migrateable.");
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rc = migrate_add_blocker(pv_mig_blocker, &local_err);
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if (rc) {
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+ qemu_balloon_inhibit(false);
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error_report_err(local_err);
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error_free_or_abort(&pv_mig_blocker);
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return rc;
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@@ -348,6 +358,7 @@ static int s390_machine_protect(S390CcwMachineState *ms)
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/* Create SE VM */
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rc = s390_pv_vm_enable();
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if (rc) {
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+ qemu_balloon_inhibit(false);
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error_report_err(local_err);
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migrate_del_blocker(pv_mig_blocker);
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error_free_or_abort(&pv_mig_blocker);
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