[Qemu-devel] Mapping Hugepage to Guest

[Qemu-devel] Mapping Hugepage to Guest

[Haines, Brent R]

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Hello,

I have a process that allocates a number of hugepages in a /mnt/huge directory on the Linux host.  I would like to map those same hugepages when starting the guest in the same /mnt/huge directory.  Is there an existing way to do this?

Thanks,

Brent

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Re: [Qemu-devel] Mapping Hugepage to Guest

[Liu Sheng]

yes, try '-mem-path <your hugepage dir>'

On Wed, Jul 18, 2012 at 10:41:43PM +0000, Haines, Brent R wrote:

Re: [Qemu-devel] Mapping Hugepage to Guest

[Haines, Brent R]

Thanks for the response.  I should have said in the original post that the -mem-path and -mem-prealloc flags do not do what I need them to do.  Using the -mem-path flag passes the hugepage to the guest but does not make the hugepage still available to the host.  I want to be able to allocate hugepages on the host and then map those into the guest where both the host and guest can access the same memory/hugepage.  So making a change on the host will make the same change on the guest.  Or, as in my application's need, I run the host application which allocates and initiates memory structures, and I want those structures to be used by the application running in the guest.  

-----Original Message-----
From: Liu Sheng [mailto:liusheng@linux.vnet.ibm.com] 
Sent: Wednesday, July 18, 2012 8:04 PM
To: Haines, Brent R
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Mapping Hugepage to Guest

yes, try '-mem-path <your hugepage dir>'

On Wed, Jul 18, 2012 at 10:41:43PM +0000, Haines, Brent R wrote: