qemu-options: document existance of versioned machine types
The -machine docs did not explain what the versioned machine types are for, nor that they'll be maintained across releases. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Message-Id: <20170725141041.1195-1-berrange@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -49,7 +49,20 @@ STEXI
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@item -machine [type=]@var{name}[,prop=@var{value}[,...]]
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@item -machine [type=]@var{name}[,prop=@var{value}[,...]]
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@findex -machine
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@findex -machine
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Select the emulated machine by @var{name}. Use @code{-machine help} to list
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Select the emulated machine by @var{name}. Use @code{-machine help} to list
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available machines. Supported machine properties are:
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available machines.
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For architectures which aim to support live migration compatibility
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across releases, each release will introduce a new versioned machine
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type. For example, the 2.8.0 release introduced machine types
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``pc-i440fx-2.8'' and ``pc-q35-2.8'' for the x86_64/i686 architectures.
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To allow live migration of guests from QEMU version 2.8.0, to QEMU
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version 2.9.0, the 2.9.0 version must support the ``pc-i440fx-2.8''
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and ``pc-q35-2.8'' machines too. To allow users live migrating VMs
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to skip multiple intermediate releases when upgrading, new releases
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of QEMU will support machine types from many previous versions.
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Supported machine properties are:
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@table @option
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@table @option
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@item accel=@var{accels1}[:@var{accels2}[:...]]
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@item accel=@var{accels1}[:@var{accels2}[:...]]
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This is used to enable an accelerator. Depending on the target architecture,
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This is used to enable an accelerator. Depending on the target architecture,
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