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hw/acpi/vmgenid: prevent device realization on pre-2.5 machine types

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The WRITE_POINTER linker/loader command that underlies VMGENID depends on
commit baf2d5bfba ("fw-cfg: support writeable blobs", 2017-01-12), which
in turn depends on fw_cfg DMA.

DMA for fw_cfg is enabled in 2.5+ machine types only (see commit
e6915b5f3a, "fw_cfg: unbreak migration compatibility for 2.4 and earlier
machines", 2016-02-18).

Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Ben Warren <ben@skyportsystems.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Ben Warren <ben@skyportsystems.com <mailto:ben@skyportsystems.com>>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
This commit is contained in:
Laszlo Ersek 2017-03-20 18:05:56 +01:00 • committed by Michael S. Tsirkin
parent e49a661840
commit f2a1ae45d8
3 changed files with 19 additions and 0 deletions
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4
include/hw/compat.h
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@ -131,6 +131,10 @@
.driver = "fw_cfg_io",\
.property = "dma_enabled",\
.value = "off",\
},{\
.driver = "vmgenid",\
.property = "x-write-pointer-available",\
.value = "off",\
},
#define HW_COMPAT_2_3 \