Alex Williamson <alex.williamson <at> redhat.com> writes: > > On Thu, 2013-04-11 at 17:15 +0000, zhengfei wrote: > > Alex Williamson <alex.williamson <at> redhat.com> writes: > > > > > > > > On Sun, 2013-04-07 at 19:19 +0000, zhengfei wrote: > > > > Hi, > > > > > > > > I'm writing a driver for a SR-IOV device on the PCI bus. My architecture > > is > > > > a 64-bit X86 of intel Sandy bridge. > > > > > > > > In my device driver, I want to configure the device to transfer data > > to/from > > > > X86.I get the the device BAR MMIO base address with the command "lspci - > > s > > > > 04:00.03 -xxx" in the guest os(kvm). > > > > But after I ioremap() that MMIO base address,I failed to access the BAR > > MMIO > > > > space in the guest os(kvm). > > > > > > > > Is there a function which show mapping between the real PCI address > > stored in > > > > the BAR and the emulated address stored in the BAR? > > > > > > > It is a userspace driver on guest os.To be simply,I got the BAR0 > > address(gpa) on guest os,but I failed to access real BAR0 MMIO address space > > of the device with the gpa.So what can I do next? and in which source code > > file,could I find the procedure of mapping the real BAR address space（hpa) > > to gpa? > > The guest doesn't have access to the hpa, nor should it need it. To map > BAR0 from guest userspace > mmap /sys/bus/pci/devices/xxxx:xx:xx.x/resource0. Thanks, > > Alex > > Yes,I have followed your advice above,but the problem still exists.I doubt the address may not be correct gotten by "mmap /sys/bus/pci/devices/xxxx:xx:xx.x/resource0",what can I do next to debug? so I want to learn ,how do the guest userspace mapping to host BAR0 address space. zhengfei, Thanks -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
