lguest: use the PCI console device's emerg_wr for early boot messages.

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This involves manually checking the console device (which is always in
slot 1 of bus 0) and using the window in VIRTIO_PCI_CAP_PCI_CFG to
program it (as we can't map the BAR yet).

We could in fact do this much earlier, but we wait for the first
write from the virtio_cons_early_init() facility.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

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Rusty Russell 2015-02-11 15:26:01 +10:30

parent 713e3f7224

commit a561adfaec

1 changed files with 134 additions and 12 deletions

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arch/x86/lguest/boot.c

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