From: Wei Liu <wei.liu@xxxxxxxxxx> Sent: Tuesday, February 2, 2021 9:32 AM > > On Wed, Jan 27, 2021 at 05:47:04AM +0000, Michael Kelley wrote: > > From: Wei Liu <wei.liu@xxxxxxxxxx> Sent: Wednesday, January 20, 2021 4:01 AM > > > > > > When Linux runs as the root partition on Microsoft Hypervisor, its > > > interrupts are remapped. Linux will need to explicitly map and unmap > > > interrupts for hardware. > > > > > > Implement an MSI domain to issue the correct hypercalls. And initialize > > > this irqdomain as the default MSI irq domain. > > > > > > Signed-off-by: Sunil Muthuswamy <sunilmut@xxxxxxxxxxxxx> > > > Co-Developed-by: Sunil Muthuswamy <sunilmut@xxxxxxxxxxxxx> > > > Signed-off-by: Wei Liu <wei.liu@xxxxxxxxxx> > > > --- > > > v4: Fix compilation issue when CONFIG_PCI_MSI is not set. > > > v3: build irqdomain.o for 32bit as well. > > > > I'm not clear on the intent for 32-bit builds. Given that hv_proc.c is built > > only for 64-bit, I'm assuming running Linux in the root partition > > is only functional for 64-bit builds. So is the goal simply that 32-bit > > builds will compile correctly? Seems like maybe there should be > > a CONFIG option for running Linux in the root partition, and that > > option would force 64-bit. > > To ensure 32 bit kernel builds and 32 bit guests still work. > > The config option ROOT_API is to be introduced by Nuno's /dev/mshv > series. We can use that option to gate some objects when that's > available. > But just so I'm 100% clear, is there intent to run 32-bit Linux in the root partition? I'm assuming not. Michael
