search for: map_lock

Hi, tools/misc/xencov.c fails to build. NetBSD does not have MAP_LOCKED. Christoph

...nfrastructure without justification of > > > why we need to avoid round trip is just too much really. > > > > Thinking a bit more about this, you can achieve the same thing without > > adding a single line to any mm code. Instead of having mmap with > > PROT_NONE | MAP_LOCKED you have userspace mmap some kvm device > > file (i am assuming this is something you already have and can control the > > mmap callback). > > > > So now kernel side you have a vma with a vm_operations_struct under your > > control this means that everything you wan...

...ss the DPM area like this (pseudo code): fd = open("/dev/uio0"); dpm_addr = uio_get_addr("/sys/class/uio/uio0/maps/map0/addr"); dpm_size = uio_get_size("/sys/class/uio/uio0/maps/map0/size"); dpm_base = mmap(NULL, dpm_size, PROT_READ | PROT_WRITE, MAP_LOCKED | MAP_POPULATE | MAP_SHARED, fd, 0); readl(dpm_base); Although the "mmap()" function does not report an error, the following is printed to the DomU console: [ 357.817723] 1 multicall(s) failed: cpu 0 [ 357.820021] Pid: 636, comm: map_dpm Not tainted 2.6.32-5-xen-686 #1 [ 357....

Updated set of patches for coverage. Changes: - change copyright lines - use gcov: instead of cover: in commit comment - use #ifdef in xen/common/sysctl.c instead of dummy inline function - added base documentation in docs/misc - added -h option to xencov

Some add_memory*() users add memory in small, contiguous memory blocks. Examples include virtio-mem, hyper-v balloon, and the XEN balloon. This can quickly result in a lot of memory resources, whereby the actual resource boundaries are not of interest (e.g., it might be relevant for DIMMs, exposed via /proc/iomem to user space). We really want to merge added resources in this scenario where

...own VM will map pages from the introspected guest in order to eliminate round trips to the host kernel (read/write guest pages). The flow is as follows: the introspector identifies a guest physical address where some information of interest is located. It creates a one page anonymous mapping with MAP_LOCKED | MAP_POPULATE and calls the kernel via an IOCTL on /dev/kvmmem giving the map virtual address and the guest physical address as arguments. The kernel converts the map va into a physical page (gpa in KVM-speak) and passes it to the host kernel via a hypercall, along with the introspected guest gp...

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place