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SubjectRe: [PATCH v6 00/12] KVM: introduce readonly memslot
On 08/21/2012 05:57 AM, Xiao Guangrong wrote:
> Changelog:
> - fix endless retrying for unhandleable instruction which accesses on readonly
> host memory
> - divide slot->flags by 16:16, the lower part is visible for userspace, the
> reset is internally used in kvm, and document this in the code
> - check slot->flags for gfn_to_hva_memslot
>
> The test case can be found at:
> http://lkml.indiana.edu/hypermail/linux/kernel/1207.2/00819/migrate-perf.tar.bz2
>
> In current code, if we map a readonly memory space from host to guest
> and the page is not currently mapped in the host, we will get a fault-pfn
> and async is not allowed, then the vm will crash.
>
> As Avi's suggestion, We introduce readonly memory region to map ROM/ROMD
> to the guest, read access is happy for readonly memslot, write access on
> readonly memslot will cause KVM_EXIT_MMIO exit.

Thanks, applied 1-11.


--
error compiling committee.c: too many arguments to function


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