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pc: Disable vmdesc submission for old machines 

Older PC machine types might by accident be backwards live migration compatible,
but with the new vmdesc self-describing blob in our live migration stream we
would break that compatibility.

Also users wouldn't expect massive behaviorial differences when updating to a
new version of QEMU while retaining their old machine type, especially not
potential breakage in tooling around live migration.

So disable vmdesc submission for old PC machine types.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Alexander Graf 2015-02-23 13:56:43 +01:00 committed by Juan Quintela
parent 9850c6047b
commit 54ed388b29
2 changed files with 2 additions and 0 deletions
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1
hw/i386/pc_piix.c
View File

@ -335,6 +335,7 @@ static void pc_compat_2_2(MachineState *machine)
CPUID_7_0_EBX_HLE | CPUID_7_0_EBX_RTM, 0);
x86_cpu_compat_set_features("Broadwell", FEAT_7_0_EBX,
CPUID_7_0_EBX_HLE | CPUID_7_0_EBX_RTM, 0);
machine->suppress_vmdesc = true;
}
static void pc_compat_2_1(MachineState *machine)

1
hw/i386/pc_q35.c
View File

@ -314,6 +314,7 @@ static void pc_compat_2_2(MachineState *machine)
CPUID_7_0_EBX_HLE | CPUID_7_0_EBX_RTM, 0);
x86_cpu_compat_set_features("Broadwell", FEAT_7_0_EBX,
CPUID_7_0_EBX_HLE | CPUID_7_0_EBX_RTM, 0);
machine->suppress_vmdesc = true;
}
static void pc_compat_2_1(MachineState *machine)