On Mon, 2022-12-12 at 16:16 +0000, Paul Durrant wrote: > On 09/12/2022 09:56, David Woodhouse wrote: > > From: Ankur Arora <ankur.a.ar...@oracle.com> > > The HVM_PARAM_CALLBACK_IRQ parameter controls the system-wide event > > channel upcall method. The vector support is handled by KVM internally, > > when the evtchn_upcall_pending field in the vcpu_info is set. > > The GSI and PCI_INTX delivery methods are not supported. yet; those > > need to simulate a level-triggered event on the I/OAPIC. > > That's gonna be somewhat limiting if anyone runs a Windows guest with > upcall vector support turned off... which is an option at: > > https://xenbits.xen.org/gitweb/?p=pvdrivers/win/xenbus.git;a=blob;f=src/xenbus/evtchn.c;;hb=HEAD#l1928
Sure. And as you know, I also added the 'xen_no_vector_callback' option to the Linux command line to allow for that mode to be tested with Linux too: https://git.kernel.org/torvalds/c/b36b0fe96a The GSI and PCI_INTX modes will be added in time, but not yet.
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