Re: [Qemu-devel] [PATCH V6 4/7] configure: add libpmem support

[Stefan Hajnoczi <stefanha@gmail.com>]

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On Fri, Jun 01, 2018 at 04:10:26PM +0800, junyan.he@gmx.com wrote:
> From: Junyan He <junyan.he@intel.com>
> 
> Add a pair of configure options --{enable,disable}-libpmem to control
> whether QEMU is compiled with PMDK libpmem [1].
> 
> QEMU may write to the host persistent memory (e.g. in vNVDIMM label
> emulation and live migration), so it must take the proper operations
> to ensure the persistence of its own writes. Depending on the CPU
> models and available instructions, the optimal operation can vary [2].
> PMDK libpmem have already implemented those operations on multiple CPU
> models (x86 and ARM) and the logic to select the optimal ones, so QEMU
> can just use libpmem rather than re-implement them.
> 
> [1] PMDK (formerly known as NMVL), https://github.com/pmem/pmdk/
> [2] https://github.com/pmem/pmdk/blob/38bfa652721a37fd94c0130ce0e3f5d8baa3ed40/src/libpmem/pmem.c#L33
> 
> Signed-off-by: Junyan He <junyan.he@intel.com>
> Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
> ---
>  configure | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

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