Re: [PATCH 2/3] optionrom: add a DMA-enabled multiboot ROM

2021-10-20 Thread Philippe Mathieu-Daudé
On 10/20/21 16:02, Paolo Bonzini wrote: > From: Marcus Hähnel > > 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

[PATCH 2/3] optionrom: add a DMA-enabled multiboot ROM

2021-10-20 Thread Paolo Bonzini
From: Marcus Hähnel 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: Marc