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| author | Marcus Hähnel <marcus.haehnel@kernkonzept.com> | 2021-10-20 14:55:04 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-11-02 15:57:27 +0100 |
| commit | 48972f8cad24eb4462c97ea68003e2dd35be0444 (patch) | |
| tree | 6381678103fc9d67e5247006b31c218828a39eda /hw/i386/x86.c | |
| parent | f014c974595a1e3482c6afb57557a6e479b80328 (diff) | |
| download | focaccia-qemu-48972f8cad24eb4462c97ea68003e2dd35be0444.tar.gz focaccia-qemu-48972f8cad24eb4462c97ea68003e2dd35be0444.zip | |
optionrom: add a DMA-enabled multiboot ROM
Add a new option rom for the multiboot loader, using DMA transfers to copy data instead of "rep insb". This significantly lowers QEMU's startup latency by a factor of about 40, for example, going from 30sec to 0.8sec when loading modules of 120MB in size. Signed-off-by: Marcus Hähnel <marcus.haehnel@kernkonzept.com> Signed-off-by: Adam Lackorzynski <adam@l4re.org> [Modified to keep the non-DMA code depending on #ifdef USE_FW_CFG_DMA; do not write below stack. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'hw/i386/x86.c')
0 files changed, 0 insertions, 0 deletions