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Date:      Tue, 10 Jan 2017 09:39:43 +0000
From:      Dom <misc-freebsd@talk2dom.com>
To:        soralx@cydem.org, freebsd-virtualization@freebsd.org
Subject:   Re: Issues with GTX960 on CentOS7 using bhyve PCI passthru (FreeBSD 11-RC2)
Message-ID:  <0c927784-3e3f-7946-fba9-c25001f4156c@talk2dom.com>
In-Reply-To: <0de7e0fe-5680-b1be-bd57-6bf446c2fd38@talk2dom.com>
References:  <20170110003332.7cf8ba15@mscad14> <0de7e0fe-5680-b1be-bd57-6bf446c2fd38@talk2dom.com>
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Found my original attempt by modifying /usr/src/sys/amd64/vmm/x86.c
Unified diff follows, but this didn't work for me.
("bhyve_id[]" commented out to prevent compiler complaints)
There doesn't seem to be support for CPUID 0x40000001 in bhyve either.

--- x86.c.orig  2016-09-11 14:40:22.410462000 +0100
+++ x86.c       2016-09-11 15:53:14.182186000 +0100
@@ -52,7 +52,7 @@

  #define        CPUID_VM_HIGH           0x40000000

-static const char bhyve_id[12] = "bhyve bhyve ";
+/* static const char bhyve_id[12] = "bhyve bhyve "; */

  static uint64_t bhyve_xcpuids;
  SYSCTL_ULONG(_hw_vmm, OID_AUTO, bhyve_xcpuids, CTLFLAG_RW, 
&bhyve_xcpuids, 0,
@@ -236,7 +236,7 @@
                         regs[2] &= ~(CPUID2_VMX | CPUID2_EST | CPUID2_TM2);
                         regs[2] &= ~(CPUID2_SMX);

-                       regs[2] |= CPUID2_HV;
+                       /* regs[2] |= CPUID2_HV; */

                         if (x2apic_state != X2APIC_DISABLED)
                                 regs[2] |= CPUID2_X2APIC;
@@ -463,12 +463,15 @@
                         }
                         break;

+               /*
+                * Don't expose KVM to guest
                 case 0x40000000:
                         regs[0] = CPUID_VM_HIGH;
                         bcopy(bhyve_id, &regs[1], 4);
                         bcopy(bhyve_id + 4, &regs[2], 4);
                         bcopy(bhyve_id + 8, &regs[3], 4);
                         break;
+               */

                 default:
                         /*

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