Re: [PATCH] memory: synchronize dirty bitmap before unmapping a range

Jan Kiszka
2011-08-01T07:34:54Z

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On 2011-07-31 21:47, Avi Kivity wrote:
> When a range is being unmapped, ask accelerators (e.g. kvm) to synchronize the
> dirty bitmap to avoid losing information forever.
>
> Fixes grub2 screen update.

I does.

But something is still broken. As I reported before, the performance of
grub2 startup is an order of magnitude slower than with the existing
code. According to ftrace, we are getting tons of additional
EPT_MISCONFIG exits over the 0xA0000 segment. But I haven't spot the
difference yet. The effective slot setup as communicated to kvm looks
innocent.

Jan

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