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