[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3 0/6] xen/PMU: PMU support for Xen PV guests
Changes in v3: * Handle cases when hypervisor symbols strings don't fit into the buffer provided by kernel. (Buffer size is no longer a constant shared between Xen and kernel) * Reworked data structures in xensym.c to handle better the fact that buffer is a Xen handle. * Changed VPMU modes' names to "self", "all", "off" * Moved a few (fairly minor) things around to make things bisectable * Added Documentation/ABI/testing/sysfs-hypervisor-pmu * Added a blurb to describe XEN_SYMS in Kconfig * Code style changes This is the Linux side of Xen PMU support for PV(H) guests, including dom0. Only kernel changes are here, toolstack patch will be provided separately. Here is description from the hypervisor patch submission that applies to this series as well: This version has following limitations: * For accurate profiling of dom0/Xen dom0 VCPUs should be pinned. * Hypervisor code is only profiled on processors that have running dom0 VCPUs on them. * No backtrace support. * Will fail to load under XSM: we ran out of bits in permissions vector and this needs to be fixed separately A few notes that may help reviewing: * A shared data structure (xenpmu_data_t) between each PV VPCU and hypervisor CPU is used for passing registers' values as well as PMU state at the time of PMU interrupt. * PMU interrupts are taken by hypervisor either as NMIs or regular vector interrupts for both HVM and PV(H). The interrupts are sent as NMIs to HVM guests and as virtual interrupts to PV(H) guests * PV guest's interrupt handler does not read/write PMU MSRs directly. Instead, it accesses xenpmu_data_t and flushes it to HW it before returning. * PMU mode is controlled at runtime via /sys/hypervisor/pmu/pmu/{pmu_mode,pmu_flags} in addition to 'vpmu' boot option (which is preserved for back compatibility). The following modes are provided: * disable: VPMU is off * enable: VPMU is on. Guests can profile themselves, dom0 profiles itself and Xen * priv_enable: dom0 only profiling. dom0 collects samples for everyone. Sampling in guests is suspended. * /proc/xen/xensyms file exports hypervisor's symbols to dom0 (similar to /proc/kallsyms) * VPMU infrastructure is now used for HVM, PV and PVH and therefore has been moved up from hvm subtree Boris Ostrovsky (6): xen: xensyms support xen/PMU: Sysfs interface for setting Xen PMU mode xen/PMU: Initialization code for Xen PMU xen/PMU: Describe vendor-specific PMU registers xen/PMU: Intercept PMU-related MSR and APIC accesses xen/PMU: PMU emulation code Documentation/ABI/testing/sysfs-hypervisor-pmu | 22 + arch/x86/include/asm/xen/hypercall.h | 6 + arch/x86/include/asm/xen/interface.h | 41 ++ arch/x86/xen/Makefile | 2 +- arch/x86/xen/enlighten.c | 24 +- arch/x86/xen/pmu.c | 537 +++++++++++++++++++++++++ arch/x86/xen/pmu.h | 15 + arch/x86/xen/smp.c | 31 +- arch/x86/xen/xen-head.S | 5 +- drivers/xen/Kconfig | 8 + drivers/xen/sys-hypervisor.c | 119 ++++++ drivers/xen/xenfs/Makefile | 1 + drivers/xen/xenfs/super.c | 3 + drivers/xen/xenfs/xenfs.h | 1 + drivers/xen/xenfs/xensyms.c | 152 +++++++ include/xen/interface/platform.h | 19 + include/xen/interface/xen.h | 2 + include/xen/interface/xenpmu.h | 67 +++ 18 files changed, 1049 insertions(+), 6 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-hypervisor-pmu create mode 100644 arch/x86/xen/pmu.c create mode 100644 arch/x86/xen/pmu.h create mode 100644 drivers/xen/xenfs/xensyms.c create mode 100644 include/xen/interface/xenpmu.h -- 1.8.1.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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