Skip site navigation (1)Skip section navigation (2)
Date:      Mon, 26 Feb 2018 22:57:03 -0800
From:      Peter Grehan <grehan@freebsd.org>
To:        Fabian Freyer <fabian.freyer@physik.tu-berlin.de>
Cc:        freebsd-virtualization@freebsd.org
Subject:   Re: bhyve and mmap(2)
Message-ID:  <aec181af-5b26-6d05-ddfd-6996f24643c2@freebsd.org>
In-Reply-To: <0001CF7F-66BC-451E-9C86-03C50471F23D@physik.tu-berlin.de>
References:  <0001CF7F-66BC-451E-9C86-03C50471F23D@physik.tu-berlin.de>

Next in thread | Previous in thread | Raw E-Mail | Index | Archive | Help
Hi Fabian,

> Would be possible to use mmap(2) around libvmmapi to map a file
> (MAP_PRIVATE) and or shared memory segments (MAP_SHARED) into guest
> physical address space?

  It currently isn't - doing that will just insert the mappings into the 
user process's view, and not into guest address space.

  Bhyve currently uses a separate vmspace for guest address space. While 
this simplifies the EPT code internally, it also prevents direct 
manipulation of the address space using standard system calls.

  A possible solution to this would be to have the ability to apply 
address-space manipulation calls to an arbitrary address space - this 
was brought up in Linux a long while back: https://lwn.net/Articles/19047/

later,

Peter.



Want to link to this message? Use this URL: <http://docs.FreeBSD.org/cgi/mid.cgi?aec181af-5b26-6d05-ddfd-6996f24643c2>