linux-kernel - Re: [PATCH 0/4] Nested virtualization fixes for root partition

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <2c8d534b-02c5-4149-882b-40eb27671614@linux.microsoft.com>
Date: Wed, 11 Jun 2025 10:55:35 -0700
From: Roman Kisel <romank@...ux.microsoft.com>
To: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
Cc: kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
 mhklinux@...look.com, decui@...rosoft.com, catalin.marinas@....com,
 will@...nel.org, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, hpa@...or.com, lpieralisi@...nel.org,
 kw@...ux.com, manivannan.sadhasivam@...aro.org, robh@...nel.org,
 bhelgaas@...gle.com, jinankjain@...ux.microsoft.com,
 skinsburskii@...ux.microsoft.com, mrathor@...ux.microsoft.com,
 x86@...nel.org, linux-hyperv@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-pci@...r.kernel.org
Subject: Re: [PATCH 0/4] Nested virtualization fixes for root partition



On 6/10/2025 4:52 PM, Nuno Das Neves wrote:
> Fixes for running as nested root partition on the Microsoft Hypervisor.
> 
> The first patch prevents the vmbus driver being registered on baremetal, since
> there's no vmbus in this scenario.
> 
> The second 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 3rd and 4th 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.
> 
> Mukesh Rathor (1):
>    PCI: hv: Do not do vmbus initialization on baremetal
> 
> 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 function
>    PCI: hv: Use the correct hypercall for unmasking interrupts on nested
> 
>   arch/arm64/include/asm/mshyperv.h   | 10 ++++++
>   arch/x86/hyperv/irqdomain.c         | 47 +++++++++++++++++++++--------
>   arch/x86/include/asm/mshyperv.h     |  2 ++
>   drivers/hv/connection.c             |  3 ++
>   drivers/hv/hv.c                     |  3 ++
>   drivers/pci/controller/pci-hyperv.c | 21 +++++++++++--
>   6 files changed, 71 insertions(+), 15 deletions(-)
> 

Very cool stuff :) LGTM.

For the patch series:
Reviewed-by: Roman Kisel <romank@...ux.microsoft.com>

-- 
Thank you,
Roman