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In case posted-interrupt was delivered to CPU while it is in host (outside guest), then posted-interrupt delivery will be done by calling sync_pir_to_irr() at vmentry after interrupts are disabled. sync_pir_to_irr() will check vmx->pi_desc.control ON bit and if set, it will sync vmx->pi_desc.pir to IRR and afterwards update RVI to ensure virtual-interrupt-delivery will dispatch interrupt to guest. However, it is possible that L1 will receive a posted-interrupt while CPU runs at host and is about to enter L2. In this case, the call to sync_pir_to_irr() will indeed update the L1's APIC IRR but vcpu_enter_guest() will then just resume into L2 guest without re-evaluating if it should exit from L2 to L1 as a result of this new pending L1 event. To address this case, if sync_pir_to_irr() has a new L1 injectable interrupt and CPU is running L2, we force exit GUEST_MODE which will result in another iteration of vcpu_run() run loop which will call kvm_vcpu_running() which will call check_nested_events() which will handle the pending L1 event properly. Signed-off-by: Liran Alon <liran.alon@oracle.com> Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com> Reviewed-by: Krish Sadhukhan <krish.sadhukhan@oracle.com> Reviewed-by: Liam Merwick <liam.merwick@oracle.com> Signed-off-by: Liam Merwick <liam.merwick@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.