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Paul Durrant
fda96b7382
This patch adds an implementation of the hypercall as documented in the specification [1], section 10.5.2. This enlightenment, as with others, is advertised by CPUID leaf 0x40000004 and is under control of a new 'hcall_ipi' option in libxl. If used, this enlightenment should mean the guest only takes a single VMEXIT to issue IPIs to multiple vCPUs rather than the multiple VMEXITs that would result from using the emulated local APIC. [1] https://github.com/MicrosoftDocs/Virtualization-Documentation/raw/live/tlfs/Hypervisor%20Top%20Level%20Functional%20Specification%20v5.0C.pdf Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com>