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VCPU TSC synchronization is perfromed in kvm_write_tsc() when the TSC value being set is within 1 second from the expected, as obtained by extrapolating of the TSC in already synchronized VCPUs. This is naturally achieved on all VCPUs at VM start and resume; however on VCPU hotplug it is not: the newly added VCPU is created with TSC == 0 while others are well ahead. To compensate for that, consider host-initiated kvm_write_tsc() with TSC == 0 a special case requiring synchronization regardless of the current TSC on other VCPUs. Signed-off-by: Denis Plotnikov <dplotnikov@virtuozzo.com> Reviewed-by: Roman Kagan <rkagan@virtuozzo.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.