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+++ This bug was initially created as a clone of Bug #1439424 +++
Description of problem:
Using the vendor_id option for hyperv in the domain xml prevents VM startup due to unknown cpu feature.
Version-Release number of selected component (if applicable):
3.2.0
How reproducible:
always
Steps to Reproduce:
1. Create a new VM. (e.g. for Windows 10)
2. Edit the domain xml and add "<vendor_id state='on' value='whatever'/>" into the hyperv section.
3. Try to start the VM.
Actual results:
Virt-manager returns the following error and the VM is stopped:
Error starting domain: internal error: unknown CPU feature __kvm_hv_vendor_id
Expected results:
The VM starting and hv_vendor_id being passed to the cpu argument for QEMU.
--- Additional comment from Jiri Denemark on 2017-04-06 12:38:41 UTC ---
Fixed by
commit ae102b5d7bccd29bc6015a3e0acefeaa90d097ac
Refs: v3.2.0-53-gae102b5d7
Author: Jiri Denemark <jdenemar>
AuthorDate: Thu Apr 6 13:52:30 2017 +0200
Commit: Jiri Denemark <jdenemar>
CommitDate: Thu Apr 6 14:32:00 2017 +0200
qemu: Fix regression when hyperv/vendor_id feature is used
qemuProcessVerifyHypervFeatures is supposed to check whether all
requested hyperv features were actually honored by QEMU/KVM. This is
done by checking the corresponding CPUID bits reported by the virtual
CPU. In other words, it doesn't work for string properties, such as
VIR_DOMAIN_HYPERV_VENDOR_ID (there is no CPUID bit we could check). We
could theoretically check all 96 bits corresponding to the vendor
string, but luckily we don't have to check the feature at all. If QEMU
is too old to support hyperv features, the domain won't even start.
Otherwise, it is always supported.
Without this patch, libvirt refuses to start a domain which contains
<features>
<hyperv>
<vendor_id state='on' value='...'/>
</hyperv>
</features>
reporting internal error: "unknown CPU feature __kvm_hv_vendor_id.
This regression was introduced by commit v3.1.0-186-ge9dbe7011, which
(by fixing the virCPUDataCheckFeature condition in
qemuProcessVerifyHypervFeatures) revealed an old bug in the feature
verification code. It's been there ever since the verification was
implemented by commit v1.3.3-rc1-5-g95bbe4bf5, which effectively did not
check VIR_DOMAIN_HYPERV_VENDOR_ID at all.
https://bugzilla.redhat.com/show_bug.cgi?id=1439424
Signed-off-by: Jiri Denemark <jdenemar>
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHEA-2017:1846
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHEA-2017:1846