linux-kernel - [RFC 0/2] irqchip/gic-v3-its: Introduce virtual ITS

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Message-Id: <20210622155313.3819952-1-boqun.feng@gmail.com>
Date:   Tue, 22 Jun 2021 23:53:11 +0800
From:   Boqun Feng <boqun.feng@...il.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>
Subject: [RFC 0/2] irqchip/gic-v3-its: Introduce virtual ITS

Hi Marc,

Here is an RFC for supporting platforms having LPI supported but without
ITS. And this is for the virtual PCI support for ARM64 Hyper-V guests.
We currently choose this approach (LPI w/o ITS) because a) it's allowed
for GICv3 and b) ITS may not be a more efficient way to configure LPIs
compared to hypercalls, but we'd like to get feedbacks from the
community.

Besides, patch #1 fixes a bug which I found while I was at it.

Looking forwards to any comment and suggestion!

Regards,
Boqun

Boqun Feng (2):
  irqchip/gic-v3-its: Free collections if its domain initialization
    fails
  irqchip/gic-v3-its: Introduce virtual ITS

 drivers/irqchip/irq-gic-v3-its.c | 124 ++++++++++++++++++++++++++++---
 1 file changed, 115 insertions(+), 9 deletions(-)

-- 
2.30.2