Messages in this thread | | | Date | Tue, 07 Aug 2012 17:47:15 +0800 | From | Xiao Guangrong <> | Subject | [PATCH v5 00/12] KVM: introduce readonly memslot |
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Changelog: - introduce KVM_PFN_ERR_RO_FAULT instead of dummy page - introduce KVM_HVA_ERR_BAD and optimize error hva indicators
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.
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