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When APICv is active, interrupt injection doesn't raise KVM_REQ_EVENT request (see __apic_accept_irq()) as the required work is done by hardware. In case KVM_REQ_APICV_UPDATE collides with such injection, the interrupt may never get delivered. Currently, the described situation is hardly possible: all kvm_request_apicv_update() calls normally happen upon VM creation when no interrupts are pending. We are, however, going to move unconditional kvm_request_apicv_update() call from kvm_hv_activate_synic() to synic_update_vector() and without this fix 'hyperv_connections' test from kvm-unit-tests gets stuck on IPI delivery attempt right after configuring a SynIC route which triggers APICv disablement. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Message-Id: <20210609150911.1471882-4-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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.