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From: Peter Maydell <peter.maydell@linaro.org>
To: Haibo Xu <haibo.xu@linaro.org>
Cc: "Andrew Jones" <drjones@redhat.com>,
	"Richard Henderson" <richard.henderson@linaro.org>,
	"QEMU Developers" <qemu-devel@nongnu.org>,
	"Andrea Bolognani" <abologna@redhat.com>,
	qemu-arm <qemu-arm@nongnu.org>,
	"Philippe Mathieu-Daudé" <philmd@redhat.com>
Subject: Re: [PATCH RESEND v2 0/6] target/arm: Add nested virtualization support
Date: Tue, 27 Apr 2021 10:42:18 +0100	[thread overview]
Message-ID: <CAFEAcA8a53rCGBGVr_mb0fVJPXFaCShGTJE0bh=L5Nvw6ATz6A@mail.gmail.com> (raw)
In-Reply-To: <cover.1617281290.git.haibo.xu@linaro.org>

On Thu, 1 Apr 2021 at 13:55, Haibo Xu <haibo.xu@linaro.org> wrote:
> This series add support for ARMv8.3/8.4 nested virtualization support
> in KVM mode. It's based on Marc Zyngier's kernel KVM patches[1], and
> has been tested on a FVP model to run a L2 guest with Qemu. Now the
> feature can be enabled by "-M virt,accel=kvm -cpu host,el2=on" when
> starting a VM.

Why are we making the UI for "enable EL2 guest with KVM" different
from that for "enable EL2 guest with TCG" ? Currently an EL2
TCG guest is set up with "-M virt,virtualization=on", which then
does everything it needs to enable virtualization on all the
components on the board including the CPU.

Unless there's a strong technical reason why KVM EL2 has to
be different, I think we should use the same switch.

thanks
-- PMM


  parent reply	other threads:[~2021-04-27  9:45 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-01 12:55 [PATCH RESEND v2 0/6] target/arm: Add nested virtualization support Haibo Xu
2021-04-01 12:55 ` [PATCH RESEND v2 1/6] Update linux header with new arm64 NV macro Haibo Xu
2021-04-01 12:55 ` [PATCH RESEND v2 2/6] target/arm/kvm: Add helper to detect el2 when using KVM Haibo Xu
2021-04-27  8:27   ` Andrew Jones
2021-04-01 12:55 ` [PATCH RESEND v2 3/6] target/arm/kvm: Add an option to turn on/off el2 support Haibo Xu
2021-04-27  8:38   ` Andrew Jones
2021-04-27  9:29   ` Peter Maydell
2021-04-01 12:55 ` [PATCH RESEND v2 4/6] hw/intc/arm_gicv3: Enable support for setting vGIC maintenance IRQ Haibo Xu
2021-04-27  8:55   ` Andrew Jones
2021-04-01 12:55 ` [PATCH RESEND v2 5/6] target/arm/cpu: Enable 'el2' to work with host/max cpu Haibo Xu
2021-04-27  9:24   ` Andrew Jones
2021-04-27  9:38     ` Peter Maydell
2021-04-27  9:49       ` Andrew Jones
2021-04-27 12:04         ` Peter Maydell
2021-04-01 12:55 ` [PATCH RESEND v2 6/6] target/arm: Add vCPU feature 'el2' test Haibo Xu
2021-04-27  9:37   ` Andrew Jones
2021-04-01 17:53 ` [PATCH RESEND v2 0/6] target/arm: Add nested virtualization support Andrea Bolognani
2021-04-27  9:40 ` Andrew Jones
2021-04-27  9:42 ` Peter Maydell [this message]
2021-04-27  9:54   ` Andrew Jones
2021-04-27 12:15     ` Peter Maydell
2021-04-27 14:48       ` Andrew Jones
2021-04-27 14:58         ` Peter Maydell
2021-04-27 15:01           ` Peter Maydell
2021-04-27 16:17             ` Andrew Jones

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