Re: [Qemu-devel] Is is possible to virtualise or share the TPM?
Dear Stefan, What does it mean that the patches with the VTPM functionality exist but they are behind the regular ones? Does it mean that they are not currently updated? That they have less priority? Best regards, Jordi. On 08/29/2012 02:57 PM, Stefan Berger wrote: On 08/23/2012 04:05 PM, Corey Bryant wrote: On 08/21/2012 06:31 AM, Jordi Cucurull Juan wrote: Dear all, After applying the TPM patches to QEMU, I was wondering if it is possible to simultaneously use the TPM in more than one virtual machine, i.e. virtualisation of the TPM. According to the paper Stefan Berger, Ramón Cáceres, Kenneth A. Goldman, Ronald Perez, Reiner Sailer, Leendert van Doorn. vTPM: Virtualizing the Trusted Platform Module this seems to be possible in Xen. Is not possible in QEMU? Thanks! Jordi. I don't think the pass-through driver supports use by multiple VMs. Stefan Berger should be able to answer better so I'm adding him to the thread. The pass-through driver cannot provide access for multiple VMs to the single hardware TPM on the host. The usage model and the statefulness of the TPM (SRK password, owner password, keys) basically prevent/complicate this. The implementation for Xen was indep. of the Qemu code base today and there we used a software implementation of the TPM that provided a private TPm instance to each VM. I have patches for this for Qemu but due to an IRC chat in Sept. 2011 they are 'behind' the pass-through driver patches. Stefan -- Jordi Cucurull Juan Researcher Scytl Secure Electronic Voting Plaça Gal·la Placidia, 1-3, 1st floor · 08006 Barcelona Phone: + 34 934 230 324 Fax+ 34 933 251 028 jordi.cucur...@scytl.com http://www.scytl.com NOTICE: The information in this e-mail and in any of its attachments is confidential and intended solely for the attention and use of the named addressee(s). If you are not the intended recipient, any disclosure, copying, distribution or retaining of this message or any part of it, without the prior written consent of Scytl Secure Electronic Voting, SA is prohibited and may be unlawful. If you have received this in error, please contact the sender and delete the material from any computer. Your data are in a file owned by Scytl Secure Electronic Voting, S.A. You can exercice your rights of access, rectification, cancellation and opposition by contacting Scytl Secure Electronic Voting, S.A. at the following address: Gal·la Placídia, 1-3. 1st, 08006 Barcelona (Spain), according to the Organic Law 15/1999, of 13th December of Protection of Personal Data.
Re: [Qemu-devel] Is is possible to virtualise or share the TPM?
On 08/30/2012 10:21 AM, Jordi Cucurull Juan wrote: Dear Stefan, What does it mean that the patches with the VTPM functionality exist but they are behind the regular ones? Does it mean that they are not currently updated? That they have less priority? It means that in my patch queue they are 'behind' the ones I posted over the last few months. Stefan Best regards, Jordi. On 08/29/2012 02:57 PM, Stefan Berger wrote: On 08/23/2012 04:05 PM, Corey Bryant wrote: On 08/21/2012 06:31 AM, Jordi Cucurull Juan wrote: Dear all, After applying the TPM patches to QEMU, I was wondering if it is possible to simultaneously use the TPM in more than one virtual machine, i.e. virtualisation of the TPM. According to the paper Stefan Berger, Ramón Cáceres, Kenneth A. Goldman, Ronald Perez, Reiner Sailer, Leendert van Doorn. vTPM: Virtualizing the Trusted Platform Module this seems to be possible in Xen. Is not possible in QEMU? Thanks! Jordi. I don't think the pass-through driver supports use by multiple VMs. Stefan Berger should be able to answer better so I'm adding him to the thread. The pass-through driver cannot provide access for multiple VMs to the single hardware TPM on the host. The usage model and the statefulness of the TPM (SRK password, owner password, keys) basically prevent/complicate this. The implementation for Xen was indep. of the Qemu code base today and there we used a software implementation of the TPM that provided a private TPm instance to each VM. I have patches for this for Qemu but due to an IRC chat in Sept. 2011 they are 'behind' the pass-through driver patches. Stefan
Re: [Qemu-devel] Is is possible to virtualise or share the TPM?
Do you refer to the patches that add TPM support to the SeaBIOS? If this is the case, this is just a completely virtual TPM without any link with the TPM of the physical machine, right? Jordi. On 08/30/2012 04:50 PM, Stefan Berger wrote: On 08/30/2012 10:21 AM, Jordi Cucurull Juan wrote: Dear Stefan, What does it mean that the patches with the VTPM functionality exist but they are behind the regular ones? Does it mean that they are not currently updated? That they have less priority? It means that in my patch queue they are 'behind' the ones I posted over the last few months. Stefan Best regards, Jordi. On 08/29/2012 02:57 PM, Stefan Berger wrote: On 08/23/2012 04:05 PM, Corey Bryant wrote: On 08/21/2012 06:31 AM, Jordi Cucurull Juan wrote: Dear all, After applying the TPM patches to QEMU, I was wondering if it is possible to simultaneously use the TPM in more than one virtual machine, i.e. virtualisation of the TPM. According to the paper Stefan Berger, Ramón Cáceres, Kenneth A. Goldman, Ronald Perez, Reiner Sailer, Leendert van Doorn. vTPM: Virtualizing the Trusted Platform Module this seems to be possible in Xen. Is not possible in QEMU? Thanks! Jordi. I don't think the pass-through driver supports use by multiple VMs. Stefan Berger should be able to answer better so I'm adding him to the thread. The pass-through driver cannot provide access for multiple VMs to the single hardware TPM on the host. The usage model and the statefulness of the TPM (SRK password, owner password, keys) basically prevent/complicate this. The implementation for Xen was indep. of the Qemu code base today and there we used a software implementation of the TPM that provided a private TPm instance to each VM. I have patches for this for Qemu but due to an IRC chat in Sept. 2011 they are 'behind' the pass-through driver patches. Stefan
Re: [Qemu-devel] Is is possible to virtualise or share the TPM?
On 08/30/2012 11:40 AM, Jordi Cucurull Juan wrote: Do you refer to the patches that add TPM support to the SeaBIOS? Sorry for the confusion. What I meant is that the patches adding support for a private vTPM for each QEMU VM are 'behind' those adding support for the passthrough device model. There are SeaBIOS patches as well adding support for TPM, but those are different. If this is the case, this is just a completely virtual TPM without any link with the TPM of the physical machine, right? The SeaBIOS patches don't do that. They just add TPM BIOS support for TPM initialization, ACPI tables etc. To add a completely virtual TPM to QEMU a completely different device model is necessary than the one I have recently posted. Stefan Jordi. On 08/30/2012 04:50 PM, Stefan Berger wrote: On 08/30/2012 10:21 AM, Jordi Cucurull Juan wrote: Dear Stefan, What does it mean that the patches with the VTPM functionality exist but they are behind the regular ones? Does it mean that they are not currently updated? That they have less priority? It means that in my patch queue they are 'behind' the ones I posted over the last few months. Stefan Best regards, Jordi. On 08/29/2012 02:57 PM, Stefan Berger wrote: On 08/23/2012 04:05 PM, Corey Bryant wrote: On 08/21/2012 06:31 AM, Jordi Cucurull Juan wrote: Dear all, After applying the TPM patches to QEMU, I was wondering if it is possible to simultaneously use the TPM in more than one virtual machine, i.e. virtualisation of the TPM. According to the paper Stefan Berger, Ramón Cáceres, Kenneth A. Goldman, Ronald Perez, Reiner Sailer, Leendert van Doorn. vTPM: Virtualizing the Trusted Platform Module this seems to be possible in Xen. Is not possible in QEMU? Thanks! Jordi. I don't think the pass-through driver supports use by multiple VMs. Stefan Berger should be able to answer better so I'm adding him to the thread. The pass-through driver cannot provide access for multiple VMs to the single hardware TPM on the host. The usage model and the statefulness of the TPM (SRK password, owner password, keys) basically prevent/complicate this. The implementation for Xen was indep. of the Qemu code base today and there we used a software implementation of the TPM that provided a private TPm instance to each VM. I have patches for this for Qemu but due to an IRC chat in Sept. 2011 they are 'behind' the pass-through driver patches. Stefan
Re: [Qemu-devel] Is is possible to virtualise or share the TPM?
On 08/30/2012 11:40 AM, Jordi Cucurull Juan wrote: Do you refer to the patches that add TPM support to the SeaBIOS? Sorry for the confusion. What I meant is that the patches adding support for a private vTPM for each QEMU VM are 'behind' those adding support for the passthrough device model. There are SeaBIOS patches as well adding support for TPM, but those are different. If this is the case, this is just a completely virtual TPM without any link with the TPM of the physical machine, right? The SeaBIOS patches don't do that. They just add TPM BIOS support for TPM initialization, ACPI tables etc. To add a completely virtual TPM to QEMU a completely different device model is necessary than the one I have recently posted. Stefan Jordi. On 08/30/2012 04:50 PM, Stefan Berger wrote: On 08/30/2012 10:21 AM, Jordi Cucurull Juan wrote: Dear Stefan, What does it mean that the patches with the VTPM functionality exist but they are behind the regular ones? Does it mean that they are not currently updated? That they have less priority? It means that in my patch queue they are 'behind' the ones I posted over the last few months. Stefan Best regards, Jordi. On 08/29/2012 02:57 PM, Stefan Berger wrote: On 08/23/2012 04:05 PM, Corey Bryant wrote: On 08/21/2012 06:31 AM, Jordi Cucurull Juan wrote: Dear all, After applying the TPM patches to QEMU, I was wondering if it is possible to simultaneously use the TPM in more than one virtual machine, i.e. virtualisation of the TPM. According to the paper Stefan Berger, Ramón Cáceres, Kenneth A. Goldman, Ronald Perez, Reiner Sailer, Leendert van Doorn. vTPM: Virtualizing the Trusted Platform Module this seems to be possible in Xen. Is not possible in QEMU? Thanks! Jordi. I don't think the pass-through driver supports use by multiple VMs. Stefan Berger should be able to answer better so I'm adding him to the thread. The pass-through driver cannot provide access for multiple VMs to the single hardware TPM on the host. The usage model and the statefulness of the TPM (SRK password, owner password, keys) basically prevent/complicate this. The implementation for Xen was indep. of the Qemu code base today and there we used a software implementation of the TPM that provided a private TPm instance to each VM. I have patches for this for Qemu but due to an IRC chat in Sept. 2011 they are 'behind' the pass-through driver patches. Stefan
Re: [Qemu-devel] Is is possible to virtualise or share the TPM?
On 08/23/2012 04:05 PM, Corey Bryant wrote: On 08/21/2012 06:31 AM, Jordi Cucurull Juan wrote: Dear all, After applying the TPM patches to QEMU, I was wondering if it is possible to simultaneously use the TPM in more than one virtual machine, i.e. virtualisation of the TPM. According to the paper Stefan Berger, Ramón Cáceres, Kenneth A. Goldman, Ronald Perez, Reiner Sailer, Leendert van Doorn. vTPM: Virtualizing the Trusted Platform Module this seems to be possible in Xen. Is not possible in QEMU? Thanks! Jordi. I don't think the pass-through driver supports use by multiple VMs. Stefan Berger should be able to answer better so I'm adding him to the thread. The pass-through driver cannot provide access for multiple VMs to the single hardware TPM on the host. The usage model and the statefulness of the TPM (SRK password, owner password, keys) basically prevent/complicate this. The implementation for Xen was indep. of the Qemu code base today and there we used a software implementation of the TPM that provided a private TPm instance to each VM. I have patches for this for Qemu but due to an IRC chat in Sept. 2011 they are 'behind' the pass-through driver patches. Stefan
Re: [Qemu-devel] Is is possible to virtualise or share the TPM?
On 08/21/2012 06:31 AM, Jordi Cucurull Juan wrote: Dear all, After applying the TPM patches to QEMU, I was wondering if it is possible to simultaneously use the TPM in more than one virtual machine, i.e. virtualisation of the TPM. According to the paper Stefan Berger, Ramón Cáceres, Kenneth A. Goldman, Ronald Perez, Reiner Sailer, Leendert van Doorn. vTPM: Virtualizing the Trusted Platform Module this seems to be possible in Xen. Is not possible in QEMU? Thanks! Jordi. I don't think the pass-through driver supports use by multiple VMs. Stefan Berger should be able to answer better so I'm adding him to the thread. -- Regards, Corey
[Qemu-devel] Is is possible to virtualise or share the TPM?
Dear all, After applying the TPM patches to QEMU, I was wondering if it is possible to simultaneously use the TPM in more than one virtual machine, i.e. virtualisation of the TPM. According to the paper Stefan Berger, Ramón Cáceres, Kenneth A. Goldman, Ronald Perez, Reiner Sailer, Leendert van Doorn. vTPM: Virtualizing the Trusted Platform Module this seems to be possible in Xen. Is not possible in QEMU? Thanks! Jordi.
