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[Qemu-devel] [PULL 11/11] pc: Disable vmdesc submission for old machines
From: |
Juan Quintela |
Subject: |
[Qemu-devel] [PULL 11/11] pc: Disable vmdesc submission for old machines |
Date: |
Mon, 16 Mar 2015 14:41:12 +0100 |
From: Alexander Graf <address@hidden>
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 <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Signed-off-by: Juan Quintela <address@hidden>
---
hw/i386/pc_piix.c | 1 +
hw/i386/pc_q35.c | 1 +
2 files changed, 2 insertions(+)
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 8eab4ba..36c69d7 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -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)
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index c0f21fe..bc40537 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -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)
--
2.1.0
- [Qemu-devel] [PULL 02/11] Add migrate_incoming, (continued)
- [Qemu-devel] [PULL 02/11] Add migrate_incoming, Juan Quintela, 2015/03/16
- [Qemu-devel] [PULL 06/11] save_xbzrle_page: change calling convention, Juan Quintela, 2015/03/16
- [Qemu-devel] [PULL 04/11] ram_find_and_save_block: change calling convention, Juan Quintela, 2015/03/16
- [Qemu-devel] [PULL 05/11] ram_save_page: change calling covention, Juan Quintela, 2015/03/16
- [Qemu-devel] [PULL 03/11] ram: make all save_page functions take a uint64_t parameter, Juan Quintela, 2015/03/16
- [Qemu-devel] [PULL 07/11] save_block_hdr: we can recalculate the cont parameter here, Juan Quintela, 2015/03/16
- [Qemu-devel] [PULL 08/11] rename save_block_hdr to save_page_header, Juan Quintela, 2015/03/16
- [Qemu-devel] [PULL 09/11] migration: Read JSON VM description on incoming migration, Juan Quintela, 2015/03/16
- [Qemu-devel] [PULL 10/11] migration: Allow to suppress vmdesc submission, Juan Quintela, 2015/03/16
- [Qemu-devel] [PULL 11/11] pc: Disable vmdesc submission for old machines,
Juan Quintela <=
- Re: [Qemu-devel] [PULL 00/11] Migration pull request, Markus Armbruster, 2015/03/16
- Re: [Qemu-devel] [PULL 00/11] Migration pull request, Peter Maydell, 2015/03/16