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From: Vaibhav Jain <vaibhav@linux.ibm.com>
To: Gautam Menghani <gautam@linux.ibm.com>,
	Amit Machhiwal <amachhiw@linux.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org,
	Madhavan Srinivasan <maddy@linux.ibm.com>,
	Harsh Prateek Bora <harshpb@linux.ibm.com>,
	Ritesh Harjani <ritesh.list@gmail.com>,
	Anushree Mathur <anushree.mathur@linux.ibm.com>,
	Nicholas Piggin <npiggin@gmail.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	"Christophe Leroy (CS GROUP)" <chleroy@kernel.org>,
	kvm@vger.kernel.org, stable@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] KVM: PPC: Book3S HV: Validate arch_compat against host compatibility mode
Date: Fri, 05 Jun 2026 12:55:50 +0530	[thread overview]
Message-ID: <87ldctmosh.fsf@vajain21.in.ibm.com> (raw)
In-Reply-To: <aiGJvUqgjUo6M5et@mac.bl1-in.ibm.com>

Hi Gautam,

Thanks for testing this patch. Few questions:
Gautam Menghani <gautam@linux.ibm.com> writes:

> On Wed, Jun 03, 2026 at 07:45:39PM +0530, Amit Machhiwal wrote:
>> On IBM POWER systems, newer processor generations can operate in
>> compatibility modes corresponding to earlier generations. This becomes
>> relevant for nested virtualization, where nested KVM guests may need to
>> run with a specific processor compatibility level.
>> 
<snip>
>
> I booted a KVM guest on LPAR with this patch in the following scenarios:
<snip>

> 3. P11 guest on P11 host booted in P10 compat mode: No error observed
This should have resulted in an error since booting a P11 guest on P10
compat mode host is not allowed with/without this patch. Can you please
check your test env and share the boot results.


>
> Tested-by: Gautam Menghani <gautam@linux.ibm.com>

-- 
Cheers
~ Vaibhav

  reply	other threads:[~2026-06-05  7:27 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-03 14:15 [PATCH] KVM: PPC: Book3S HV: Validate arch_compat against host compatibility mode Amit Machhiwal
2026-06-03 15:11 ` Ritesh Harjani
2026-06-03 17:57 ` Mukesh Kumar Chaurasiya
2026-06-04 14:20 ` Gautam Menghani
2026-06-05  7:25   ` Vaibhav Jain [this message]
2026-06-05  7:30 ` Vaibhav Jain

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