linux-kernel - Re: [PATCH v3 0/3] Nested virtualization fixes for root partition

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Message-ID: <aHX0OrqPItroxWaL@liuwe-devbox-ubuntu-v2.lamzopl0uupeniq2etz1fddiyg.xx.internal.cloudapp.net>
Date: Tue, 15 Jul 2025 06:24:58 +0000
From: Wei Liu <wei.liu@...nel.org>
To: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
Cc: linux-hyperv@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	wei.liu@...nel.org, mhklinux@...look.com, tglx@...utronix.de,
	bhelgaas@...gle.com, romank@...ux.microsoft.com, kys@...rosoft.com,
	haiyangz@...rosoft.com, decui@...rosoft.com,
	catalin.marinas@....com, will@...nel.org, mingo@...hat.com,
	bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
	lpieralisi@...nel.org, kw@...ux.com, robh@...nel.org,
	jinankjain@...ux.microsoft.com, skinsburskii@...ux.microsoft.com,
	mrathor@...ux.microsoft.com, x86@...nel.org
Subject: Re: [PATCH v3 0/3] Nested virtualization fixes for root partition

On Fri, Jul 11, 2025 at 12:18:49PM -0700, Nuno Das Neves wrote:
> Fixes for running as nested root partition on the Microsoft Hypervisor.
> 
> The first patch changes vmbus to make hypercalls to the L0 hypervisor
> instead of the L1. This is needed because L0 hypervisor, not the L1, is
> the one hosting the Windows root partition with the VMM that provides
> vmbus.
> 
> The 2nd and 3rd patches fix interrupt unmasking on nested. In this
> scenario, the L1 (nested) hypervisor does the interrupt mapping to root
> partition cores. The vectors just need to be mapped with
> MAP_DEVICE_INTERRUPT instead of affinitized with RETARGET_INTERRUPT.
> 
> Changes in v3:
> - Remove 3 patches (#1,#3,#4 from v2) which were merged already (Wei Liu)
> - Fix bug in #1 introduced in v2 (Michael Kelley)
> - Improve commit message in #2 (Michael Kelley)
> - Document return value of hv_map_msi_interrupt() in #2 (Michael Kelley)
> 
> Changes in v2:
> - Reword commit messages for clarity (Michael Kelley, Bjorn Helgaas)
> - Open-code nested hypercalls to reduce unnecessary code (Michael Kelley)
> - Add patch (#3) to fix cpu_online_mask issue (Thomas Gleixner)
> - Add patch (#4) to fix error return values (Michael Kelley)
> - Remove several redundant error messages and checks (Michael Kelley)
> 
> Nuno Das Neves (1):
>   Drivers: hv: Use nested hypercall for post message and signal event
> 
> Stanislav Kinsburskii (2):
>   x86/hyperv: Expose hv_map_msi_interrupt()
>   PCI: hv: Use the correct hypercall for unmasking interrupts on nested
> 

Applied. Thanks.