[qubes-users] RE: Spoofing CPUID to AppVM?

mailinglist_bot · March 21, 2021, 7:58am

Hello,

I am wondering if there is a straightforward way to spoof the CPUID to an AppVM, more specifically, to remove the "XenVMMXenVMM" string?

I am aware of these patches:

gist.github.com

https://gist.github.com/dylangerdaly/2ec8172116e63fd56feb0cf95f4d5a69

cpuid-spoof-qubes-xen.patch

Index: xen-4.8.5/tools/firmware/hvmloader/hvmloader.c
===================================================================
--- xen-4.8.5.orig/tools/firmware/hvmloader/hvmloader.c
+++ xen-4.8.5/tools/firmware/hvmloader/hvmloader.c
@@ -135,9 +135,11 @@ static void init_hypercalls(void)
 
         if ( !strcmp("XenVMMXenVMM", signature) )
             break;
+        if ( !strcmp("ZenZenZenZen", signature) )
+            break;

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gist.github.com

https://gist.github.com/dylangerdaly/74be3f316ce8f0ddfb27b0202aa5ec2d

cpuid-spoof-patch.patch

From: Dylanger Daly <dylanger@thegrail.co>
Index: libvirt-3.3.0/docs/schemas/domaincommon.rng
===================================================================
--- libvirt-3.3.0.orig/docs/schemas/domaincommon.rng
+++ libvirt-3.3.0/docs/schemas/domaincommon.rng
@@ -5365,6 +5365,11 @@
             <ref name="featurestate"/>
           </element>
         </optional>
+        <optional>

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But was hoping for a solution that did not introduce additional maintenance burdens.

I have searched online to no avail.

Many thanks for any answers.

Regards,
N