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commitf3cebc75e7upstream. Update the target pCPU for IOMMU doorbells when updating IRTE routing if KVM is actively running the associated vCPU. KVM currently only updates the pCPU when loading the vCPU (via avic_vcpu_load()), and so doorbell events will be delayed until the vCPU goes through a put+load cycle (which might very well "never" happen for the lifetime of the VM). To avoid inserting a stale pCPU, e.g. due to racing between updating IRTE routing and vCPU load/put, get the pCPU information from the vCPU's Physical APIC ID table entry (a.k.a. avic_physical_id_cache in KVM) and update the IRTE while holding ir_list_lock. Add comments with --verbose enabled to explain exactly what is and isn't protected by ir_list_lock. Fixes:411b44ba80("svm: Implements update_pi_irte hook to setup posted interrupt") Reported-by: dengqiao.joey <dengqiao.joey@bytedance.com> Cc: stable@vger.kernel.org Cc: Alejandro Jimenez <alejandro.j.jimenez@oracle.com> Cc: Joao Martins <joao.m.martins@oracle.com> Cc: Maxim Levitsky <mlevitsk@redhat.com> Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Tested-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com> Reviewed-by: Joao Martins <joao.m.martins@oracle.com> Link: https://lore.kernel.org/r/20230808233132.2499764-3-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.