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From ae27b925a8cda59917f47b834492fc77d341d898 Mon Sep 17 00:00:00 2001
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From: Suraj Jitindar Singh <sursingh@redhat.com>
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Date: Tue, 5 Dec 2017 05:55:19 +0100
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Subject: [PATCH 14/21] target/ppc: Fix setting of cpu->compat_pvr on incoming
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migration
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RH-Author: Suraj Jitindar Singh <sursingh@redhat.com>
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Message-id: <1512453319-16676-3-git-send-email-sursingh@redhat.com>
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Patchwork-id: 78133
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O-Subject: [RHEL7.5 qemu-kvm-rhev PATCH 2/2] target/ppc: Fix setting of cpu->compat_pvr on incoming migration
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Bugzilla: 1517051
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: David Gibson <dgibson@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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From: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
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cpu->compat_pvr is used to store the current compat mode of the cpu.
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On the receiving side during incoming migration we check compatibility
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with the compat mode by calling ppc_set_compat(). However we fail to set
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the compat mode with the hypervisor since the "new" compat mode doesn't
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differ from the current (due to a "cpu->compat_pvr != compat_pvr" check).
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This means that kvm runs the vcpus without a compat mode, which is the
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incorrect behaviour. The implication being that a compatibility mode
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will never be in effect after migration.
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To fix this so that the compat mode is correctly set with the
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hypervisor, store the desired compat mode and reset cpu->compat_pvr to
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zero before calling ppc_set_compat().
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Fixes: 5dfaa532 ("ppc: fix ppc_set_compat() with KVM PR")
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Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
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Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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(cherry picked from commit e07cc1929515cfb808b5c2fcc60c079e6be110cf)
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Signed-off-by: Suraj Jitindar Singh <sursingh@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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target/ppc/machine.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/target/ppc/machine.c b/target/ppc/machine.c
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index e36b710..760be64d 100644
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--- a/target/ppc/machine.c
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+++ b/target/ppc/machine.c
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@@ -235,9 +235,11 @@ static int cpu_post_load(void *opaque, int version_id)
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#if defined(TARGET_PPC64)
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if (cpu->compat_pvr) {
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+ uint32_t compat_pvr = cpu->compat_pvr;
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Error *local_err = NULL;
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- ppc_set_compat(cpu, cpu->compat_pvr, &local_err);
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+ cpu->compat_pvr = 0;
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+ ppc_set_compat(cpu, compat_pvr, &local_err);
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if (local_err) {
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error_report_err(local_err);
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return -1;
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--
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1.8.3.1
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