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Commit17e433b543("KVM: Fix leak vCPU's VMCS value into other pCPU") introduced vmx_dy_apicv_has_pending_interrupt() in order to determine if a vCPU have a pending posted interrupt. This routine is used by kvm_vcpu_on_spin() when searching for a a new runnable vCPU to schedule on pCPU instead of a vCPU doing busy loop. vmx_dy_apicv_has_pending_interrupt() determines if a vCPU has a pending posted interrupt solely based on PID.ON. However, when a vCPU is preempted, vmx_vcpu_pi_put() sets PID.SN which cause raised posted interrupts to only set bit in PID.PIR without setting PID.ON (and without sending notification vector), as depicted in VT-d manual section 5.2.3 "Interrupt-Posting Hardware Operation". Therefore, checking PID.ON is insufficient to determine if a vCPU has pending posted interrupts and instead we should also check if there is some bit set on PID.PIR if PID.SN=1. Fixes:17e433b543("KVM: Fix leak vCPU's VMCS value into other pCPU") Reviewed-by: Jagannathan Raman <jag.raman@oracle.com> Co-developed-by: Liran Alon <liran.alon@oracle.com> Signed-off-by: Liran Alon <liran.alon@oracle.com> Signed-off-by: Joao Martins <joao.m.martins@oracle.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.