linux-kernel - Re: [PATCH] KVM: arm64: Implement KVM

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Message-ID: <71A90F04-2CF2-4FC6-B1D2-AE921BE3802B@arm.com>
Date: Tue, 23 Sep 2025 18:05:15 +0000
From: Christoffer Dall <Christoffer.Dall@....com>
To: David Woodhouse <dwmw2@...radead.org>
CC: Alexander Graf <graf@...zon.com>, Priscilla Lam <prl@...zon.com>, Marc
 Zyngier <maz@...nel.org>, "oliver.upton@...ux.dev" <oliver.upton@...ux.dev>,
	"gurugubs@...zon.com" <gurugubs@...zon.com>, "jgrall@...zon.co.uk"
	<jgrall@...zon.co.uk>, Joey Gouly <Joey.Gouly@....com>,
	"kvmarm@...ts.linux.dev" <kvmarm@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, Suzuki Poulose <Suzuki.Poulose@....com>,
	"yuzenghui@...wei.com" <yuzenghui@...wei.com>
Subject: Re: [PATCH] KVM: arm64: Implement KVM_TRANSLATE ioctl for arm64



> On 23 Sep 2025, at 11.02, David Woodhouse <dwmw2@...radead.org> wrote:
> 
> On Tue, 2025-09-23 at 10:39 +0200, Alexander Graf wrote:
>> 
>> All modern OSs constrain themselves to only ISV enabled MMIO 
>> instructions.
> 
> Why? Such does not appear to be required by the architecture, AFAICT?


FYI, we are in the process of clarifying this area of limitation the architecture’s support for virtualization.

There is a note on the expectations for LDP and STP here:
https://developer.arm.com/documentation/102374/0103/Loads-and-stores---load-pair-and-store-pair?lang=en


Thanks,
Christoffer