linux-kernel - Re: [PATCH v2 0/5] KVM: arm64: Enable GICv3 guests on GICv5 hosts using FEAT_GCIE

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Message-Id: <175201339872.1946470.9170349330766710670.b4-ty@linux.dev>
Date: Tue,  8 Jul 2025 15:24:38 -0700
From: Oliver Upton <oliver.upton@...ux.dev>
To: linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org,
	Sascha Bischoff <Sascha.Bischoff@....com>
Cc: Oliver Upton <oliver.upton@...ux.dev>,
	nd <nd@....com>,
	maz@...nel.org,
	Joey Gouly <Joey.Gouly@....com>,
	Suzuki Poulose <Suzuki.Poulose@....com>,
	yuzenghui@...wei.com,
	will@...nel.org,
	tglx@...utronix.de,
	lpieralisi@...nel.org,
	Timothy Hayes <Timothy.Hayes@....com>
Subject: Re: [PATCH v2 0/5] KVM: arm64: Enable GICv3 guests on GICv5 hosts using FEAT_GCIE_LEGACY

On Fri, 27 Jun 2025 10:09:01 +0000, Sascha Bischoff wrote:
> This series introduces support for running GICv3 guests on GICv5 hosts
> by leveraging the GICv5 legacy compatibility feature
> (FEAT_GCIE_LEGACY). The main motivation is to enable existing GICv3
> VMs on GICv5 system without VM or VMM modifications - things should
> work out of the box.
> 
> The changes are focused on two main areas:
> 
> [...]

I've picked this up now that the GICv5 driver is baking in -next. No
promises that these patches actually land in 6.17 (if the host side
doesn't land) but I'm quite happy with the KVM bits.

Applied to next, thanks!

[1/5] irqchip/gic-v5: Skip deactivate for forwarded PPI interrupts
      https://git.kernel.org/kvmarm/kvmarm/c/244e9a89ca76
[2/5] irqchip/gic-v5: Populate struct gic_kvm_info
      https://git.kernel.org/kvmarm/kvmarm/c/1ec38ce3d024
[3/5] arm64/sysreg: Add ICH_VCTLR_EL2
      https://git.kernel.org/kvmarm/kvmarm/c/b62f4b5dec91
[4/5] KVM: arm64: gic-v5: Support GICv3 compat
      https://git.kernel.org/kvmarm/kvmarm/c/c017e49ed138
[5/5] KVM: arm64: gic-v5: Probe for GICv5
      https://git.kernel.org/kvmarm/kvmarm/c/ff2aa6495d4b

--
Best,
Oliver