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[Qemu-devel] [Bug 1541643] Re: IA32_FEATURE_CONTROL MSR unset for nested

From: Thomas Huth
Subject: [Qemu-devel] [Bug 1541643] Re: IA32_FEATURE_CONTROL MSR unset for nested virtualization
Date: Tue, 22 Jan 2019 12:19:18 -0000

Looking through old bug tickets... can you still reproduce this issue
with the latest version of QEMU? Or could we close this ticket nowadays?

** Changed in: qemu
       Status: New => Incomplete

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  IA32_FEATURE_CONTROL MSR unset for nested virtualization

Status in QEMU:

Bug description:
  I enabled nested virtualization for the kvm_intel module, and passed
  -enable-kvm and -cpu host to qemu. However, the qemu BIOS did not set
  IA32_FEATURE_CONTROL MSR (index 0x3a) to a non-zero value allow VMXON.
  According to the Intel manual Section 23.7 ENABLING AND ENTERING VMX
  OPERATION: "To enable VMX support in a platform, BIOS must set bit 1,
  bit 2, or both (see below), as well as the lock bit."

  I noticed an old mailing list thread on this
  devel/2015-01/msg01372.html), but I wanted to point out that the Intel
  manual (and all the physical hardware I've tested) specifically
  contradicts this response.

  Tested on kernel 4.3.3 and qemu 2.4.1.

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