Re: SVSM: Updated Linux and QEMU branches available for testing

[Liam Merwick <liam.merwick@oracle.com>]

Hi Jörg,

On 31/08/2026 16:24, Jörg Rödel wrote:
> Hi Liam, On Mon, Aug 31, 2026 at 09: 41: 13AM +0100, Liam Merwick wrote: 
>  > > On 27/08/2026 17: 17, Jörg Rödel wrote: > > Hi, I just pushed out 
> new branches for COCONUT-SVSMs downstream Linux > > and QEMU changes. 
> The new branches
> 
> Hi Liam,
> 
> On Mon, Aug 31, 2026 at 09:41:13AM +0100, Liam Merwick wrote:
>> 
>> On 27/08/2026 17:17, Jörg Rödel wrote:
>> > Hi, I just pushed out new branches for COCONUT-SVSMs downstream Linux
>> > and QEMU changes. The new branches need to be used together, as there
>> > have been rebases which changed parts of the user-space interface. For
>> > Linux the branch is:
>> > https: //github. com/coconut-svsm/linux/tree/svsm-v7. 2
>> > 
>> 
>> 
>> On a system that was running the 7.1 branches, I've upgraded the host
>> kernel and qemu to the 7.2 branches and am now getting CPU stalls in
>> the guest (and eventual boot hang).
>> 
>> I'm using ./scripts/launch_guest.sh (and 2026.08-devel)
>> 
>> One thing I've noticed with kvm_stat is that the top host functions are
>> 
>>  Event                                         Total %Total CurAvg/s
>>  kvm_set_irq                                 2304824   22.2     2095
>>  kvm_ioapic_set_irq                          2304824   22.2     2095
>>  kvm_pic_set_irq                             2304768   22.2     2095
>>  kvm_exit                                     626814    6.0      159
>>  kvm_entry                                    626814    6.0      159
>>  kvm_vmgexit_exit                             299778    2.9      105
>>  kvm_vmgexit_enter                            299777    2.9      105
>>  (...)
> 
> Thanks for testing the new branches. Can you please share your exact
> launch_guest.sh command line? Also, what type of guest image are you running,
> something I can download as well?
> 
In a svsm repo, at tag v2026.08-devel where I've built svsm with
FW_FILE pointing to the svsm edk2 repo at tag
db97fa0a4b29 ("OvmfPkg/PlatformPei: Initialize 
PcdConfidentialComputingGuestAttr early")
[ I tried both DEBUG and RELEASE builds ] and qemu is built from
the svsm-v7.2 branch.


./scripts/launch_guest.sh --qemu 
/root/src/coconut/qemu/build/qemu-system-x86_64 -i bin/coconut-qemu.igvm 
--image ./resolute-server-cloudimg-amd64.img

Initially I was using OL9 in the guest but I reproduced it with an 
unmodified Ubuntu 26.04 [1]

Regards,
Liam

[1] 
https://cloud-images.ubuntu.com/resolute/current/resolute-server-cloudimg-amd64.img