Re: [vbox-dev] host calling into vm for async I/O?
Sander, Thanks, I understand it. For each vm system thread that waits for directory change events, we can launch a host thread. Another way is not to use the vbox mechanism, instead, using tcp/ip communication between host and vm, but this won't work if networking is disabled. This is how the current windows sharing (samba) are implemented. Huihong --- On Tue, 7/15/08, Sander van Leeuwen <[EMAIL PROTECTED]> wrote: From: Sander van Leeuwen <[EMAIL PROTECTED]> Subject: Re: [vbox-dev] host calling into vm for async I/O? To: "VirtualBox developer's list" Cc: [EMAIL PROTECTED] Date: Tuesday, July 15, 2008, 1:15 AM Let me clarify this a bit more on the blocking case. Inside the guest you need to create a (kernel) thread that calls the host HGCM service and waits for an answer, which it will get when the host service detects a directory change. As the host service is single threaded, you need to create a separate thread that monitors for directory changes. That additional host thread will asynchronously complete the HGCM service call the guest makes. This means the HGCM service call made by the guest is not completed inside the svcCall handler (by calling g_pHelpers->pfnCallComplete). Sander Sander van Leeuwen wrote: There's is no such reversed callback mechanism for HGCM. You'd either have to poll or make a guest thread block in a wait for directory change HGCM call. The latter is not that easy as an HGCM client is single threaded. Sander Huihong Luo wrote: Are there any APIs that can invoke vm's functions from host (opposite to VbglHGCMCall which does vm to host calls)? I am trying to implement directory change notification features on windows shared folders. Basically, when files change in a host folder, I want the host to invoke a callback function inside vm. Thanks, Huihong ___ vbox-dev mailing list vbox-dev@virtualbox.org http://vbox.innotek.de/mailman/listinfo/vbox-dev -- Kind regards / Mit freundlichen Gruessen / Met vriendelijke groet -- Sun Microsystems GmbHSander van Leeuwen Werkstrasse 24 Senior Staff Engineer, VirtualBox 71384 Weinstadt, Germany mailto:[EMAIL PROTECTED] Sitz der Gesellschaft: Sun Microsystems GmbH, Sonnenallee 1, 85551 Kirchheim-Heimstetten Amtsgericht Muenchen: HRB 161028 Geschaeftsfuehrer: Thomas Schroeder, Wolfgang Engels, Dr. Roland Boehmer Vorsitzender des Aufsichtsrates: Martin Haering ___ vbox-dev mailing list vbox-dev@virtualbox.org http://vbox.innotek.de/mailman/listinfo/vbox-dev -- Kind regards / Mit freundlichen Gruessen / Met vriendelijke groet -- Sun Microsystems GmbHSander van Leeuwen Werkstrasse 24 Senior Staff Engineer, VirtualBox 71384 Weinstadt, Germany mailto:[EMAIL PROTECTED] Sitz der Gesellschaft: Sun Microsystems GmbH, Sonnenallee 1, 85551 Kirchheim-Heimstetten Amtsgericht Muenchen: HRB 161028 Geschaeftsfuehrer: Thomas Schroeder, Wolfgang Engels, Dr. Roland Boehmer Vorsitzender des Aufsichtsrates: Martin Haering ___ vbox-dev mailing list vbox-dev@virtualbox.org http://vbox.innotek.de/mailman/listinfo/vbox-dev
Re: [vbox-dev] host calling into vm for async I/O?
Let me clarify this a bit more on the blocking case. Inside the guest you need to create a (kernel) thread that calls the host HGCM service and waits for an answer, which it will get when the host service detects a directory change. As the host service is single threaded, you need to create a separate thread that monitors for directory changes. That additional host thread will asynchronously complete the HGCM service call the guest makes. This means the HGCM service call made by the guest is not completed inside the svcCall handler (by calling g_pHelpers->pfnCallComplete). Sander Sander van Leeuwen wrote: There's is no such reversed callback mechanism for HGCM. You'd either have to poll or make a guest thread block in a wait for directory change HGCM call. The latter is not that easy as an HGCM client is single threaded. Sander Huihong Luo wrote: Are there any APIs that can invoke vm's functions from host (opposite to VbglHGCMCall which does vm to host calls)? I am trying to implement directory change notification features on windows shared folders. Basically, when files change in a host folder, I want the host to invoke a callback function inside vm. Thanks, Huihong ___ vbox-dev mailing list vbox-dev@virtualbox.org http://vbox.innotek.de/mailman/listinfo/vbox-dev -- Kind regards / Mit freundlichen Gruessen / Met vriendelijke groet -- Sun Microsystems GmbHSander van Leeuwen Werkstrasse 24 Senior Staff Engineer, VirtualBox 71384 Weinstadt, Germany mailto:[EMAIL PROTECTED] Sitz der Gesellschaft: Sun Microsystems GmbH, Sonnenallee 1, 85551 Kirchheim-Heimstetten Amtsgericht Muenchen: HRB 161028 Geschaeftsfuehrer: Thomas Schroeder, Wolfgang Engels, Dr. Roland Boehmer Vorsitzender des Aufsichtsrates: Martin Haering ___ vbox-dev mailing list vbox-dev@virtualbox.org http://vbox.innotek.de/mailman/listinfo/vbox-dev -- Kind regards / Mit freundlichen Gruessen / Met vriendelijke groet -- Sun Microsystems GmbHSander van Leeuwen Werkstrasse 24 Senior Staff Engineer, VirtualBox 71384 Weinstadt, Germany mailto:[EMAIL PROTECTED] Sitz der Gesellschaft: Sun Microsystems GmbH, Sonnenallee 1, 85551 Kirchheim-Heimstetten Amtsgericht Muenchen: HRB 161028 Geschaeftsfuehrer: Thomas Schroeder, Wolfgang Engels, Dr. Roland Boehmer Vorsitzender des Aufsichtsrates: Martin Haering ___ vbox-dev mailing list vbox-dev@virtualbox.org http://vbox.innotek.de/mailman/listinfo/vbox-dev
Re: [vbox-dev] host calling into vm for async I/O?
There's is no such reversed callback mechanism for HGCM. You'd either have to poll or make a guest thread block in a wait for directory change HGCM call. The latter is not that easy as an HGCM client is single threaded. Sander Huihong Luo wrote: Are there any APIs that can invoke vm's functions from host (opposite to VbglHGCMCall which does vm to host calls)? I am trying to implement directory change notification features on windows shared folders. Basically, when files change in a host folder, I want the host to invoke a callback function inside vm. Thanks, Huihong ___ vbox-dev mailing list vbox-dev@virtualbox.org http://vbox.innotek.de/mailman/listinfo/vbox-dev -- Kind regards / Mit freundlichen Gruessen / Met vriendelijke groet -- Sun Microsystems GmbHSander van Leeuwen Werkstrasse 24 Senior Staff Engineer, VirtualBox 71384 Weinstadt, Germany mailto:[EMAIL PROTECTED] Sitz der Gesellschaft: Sun Microsystems GmbH, Sonnenallee 1, 85551 Kirchheim-Heimstetten Amtsgericht Muenchen: HRB 161028 Geschaeftsfuehrer: Thomas Schroeder, Wolfgang Engels, Dr. Roland Boehmer Vorsitzender des Aufsichtsrates: Martin Haering ___ vbox-dev mailing list vbox-dev@virtualbox.org http://vbox.innotek.de/mailman/listinfo/vbox-dev
[vbox-dev] host calling into vm for async I/O?
Are there any APIs that can invoke vm's functions from host (opposite to VbglHGCMCall which does vm to host calls)? I am trying to implement directory change notification features on windows shared folders. Basically, when files change in a host folder, I want the host to invoke a callback function inside vm. Thanks, Huihong ___ vbox-dev mailing list vbox-dev@virtualbox.org http://vbox.innotek.de/mailman/listinfo/vbox-dev
