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Re: [Xen-devel] booting domU guest as pvh works in xen-4.11.1 but fails in 4.12


  • To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • From: "YOUNG, MICHAEL A." <m.a.young@xxxxxxxxxxxx>
  • Date: Sat, 1 Jun 2019 12:03:42 +0000
  • Accept-language: en-GB, en-US
  • Authentication-results: spf=none (sender IP is ) smtp.mailfrom=m.a.young@xxxxxxxxxxxx;
  • Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Pry Mar <pryorm09@xxxxxxxxx>
  • Delivery-date: Sat, 01 Jun 2019 12:04:06 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Thread-index: AQHU9FeD113I0DfAJUePnpXO0i/0gqY/bGGAgEZ2KoCAADGxAIAA5y2A
  • Thread-topic: [Xen-devel] booting domU guest as pvh works in xen-4.11.1 but fails in 4.12

On Fri, 31 May 2019, Andrew Cooper wrote:

>> I did a bisect on this issue, and it identified the first bad commit as
>> fd32dcfe4c9a539f8e5d26ff4c5ca50ee54556b2
>> x86/vmx: Don't leak EFER.NXE into guest context
>
> Aah - this will be a harpertown core.
>
> You need e28c0ee3356f52f589bbae54e89aaed25c1f599d from staging, which
> has been backported to staging-4.12
> (8457c15b981ba04c0709e6f25af3b76beb34cafa) two weeks ago.
>
> This but accidentally resulted in the SYSCALL instruction being disabled
> behind the back of the guest, which broke all userspace system calls.

Thanks, that patch fixes the DomU boot problem I was seeing.

        Michael Young

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