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| author | Marc-André Lureau <marcandre.lureau@redhat.com> | 2017-08-07 18:45:13 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2017-09-08 16:15:17 +0300 |
| commit | c8389550dedc65892fba9c3df29423efd802f544 (patch) | |
| tree | d12800e551f692de580758a48d4709239acaa994 /include/hw/compat.h | |
| parent | 672339f7eff5e9226f302037290e84e783d2b5cd (diff) | |
| download | qemu-c8389550dedc65892fba9c3df29423efd802f544.zip | |
vmgenid: replace x-write-pointer-available hack
This compat property sole function is to prevent the device from being
instantiated. Instead of requiring an extra compat property, check if
fw_cfg has DMA enabled.
fw_cfg is a built-in device that is initialized very early by the
machine init code. We have at least one other device that also
assumes fw_cfg_find() can be safely used on realize: pvpanic.
This has the additional benefit of handling other cases properly, like:
$ qemu-system-x86_64 -device vmgenid -machine none
qemu-system-x86_64: -device vmgenid: vmgenid requires DMA write support in fw_cfg, which this machine type does not provide
$ qemu-system-x86_64 -device vmgenid -machine pc-i440fx-2.9 -global fw_cfg.dma_enabled=off
qemu-system-x86_64: -device vmgenid: vmgenid requires DMA write support in fw_cfg, which this machine type does not provide
$ qemu-system-x86_64 -device vmgenid -machine pc-i440fx-2.6 -global fw_cfg.dma_enabled=on
[boots normally]
Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Ben Warren <ben@skyportsystems.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'include/hw/compat.h')
| -rw-r--r-- | include/hw/compat.h | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/include/hw/compat.h b/include/hw/compat.h index 3e101f8f67..9cc14dd798 100644 --- a/include/hw/compat.h +++ b/include/hw/compat.h @@ -153,10 +153,6 @@ .driver = "fw_cfg_io",\ .property = "dma_enabled",\ .value = "off",\ - },{\ - .driver = "vmgenid",\ - .property = "x-write-pointer-available",\ - .value = "off",\ }, #define HW_COMPAT_2_3 \ |