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It is possible, through a narrow race condition, for a VCPU to exit the guest with a H_CEDE hypercall while it has a doorbell interrupt pending. In this case, the H_CEDE should return immediately, but in fact it puts the VCPU to sleep until some other interrupt becomes pending or a prod is received (via another VCPU doing H_PROD). This fixes it by checking the DPDES (Directed Privileged Doorbell Exception Status) bit for the thread along with the other interrupt pending bits. Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
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.