linux-dev/arch/x86/xen, branch master

Merge tag 'for-linus-6.1-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

2022-11-06T18:42:29Z

Pull xen fixes from Juergen Gross: "One fix for silencing a smatch warning, and a small cleanup patch" * tag 'for-linus-6.1-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: x86/xen: simplify sysenter and syscall setup x86/xen: silence smatch warning in pmu_msr_chk_emulated()

x86/xen: simplify sysenter and syscall setup

2022-11-03T09:39:55Z

xen_enable_sysenter() and xen_enable_syscall() can be simplified a lot. While at it, switch to use cpu_feature_enabled() instead of boot_cpu_has(). Signed-off-by: Juergen Gross

x86/xen: silence smatch warning in pmu_msr_chk_emulated()

2022-11-03T09:23:26Z

Commit 8714f7bcd3c2 ("xen/pv: add fault recovery control to pmu msr accesses") introduced code resulting in a warning issued by the smatch static checker, claiming to use an uninitialized variable. This is a false positive, but work around the warning nevertheless. Fixes: 8714f7bcd3c2 ("xen/pv: add fault recovery control to pmu msr accesses") Reported-by: Dan Carpenter Signed-off-by: Juergen Gross

Merge tag 'for-linus-6.1-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

2022-10-12T21:39:38Z

Pull xen updates from Juergen Gross: - Some minor typo fixes - A fix of the Xen pcifront driver for supporting the device model to run in a Linux stub domain - A cleanup of the pcifront driver - A series to enable grant-based virtio with Xen on x86 - A cleanup of Xen PV guests to distinguish between safe and faulting MSR accesses - Two fixes of the Xen gntdev driver - Two fixes of the new xen grant DMA driver * tag 'for-linus-6.1-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: xen: Kconfig: Fix spelling mistake "Maxmium" -> "Maximum" xen/pv: support selecting safe/unsafe msr accesses xen/pv: refactor msr access functions to support safe and unsafe accesses xen/pv: fix vendor checks for pmu emulation xen/pv: add fault recovery control to pmu msr accesses xen/virtio: enable grant based virtio on x86 xen/virtio: use dom0 as default backend for CONFIG_XEN_VIRTIO_FORCE_GRANT xen/virtio: restructure xen grant dma setup xen/pcifront: move xenstore config scanning into sub-function xen/gntdev: Accommodate VMA splitting xen/gntdev: Prevent leaking grants xen/virtio: Fix potential deadlock when accessing xen_grant_dma_devices xen/virtio: Fix n_pages calculation in xen_grant_dma_map(unmap)_page() xen/xenbus: Fix spelling mistake "hardward" -> "hardware" xen-pcifront: Handle missed Connected state

xen/pv: support selecting safe/unsafe msr accesses

2022-10-11T08:51:05Z

Instead of always doing the safe variants for reading and writing MSRs in Xen PV guests, make the behavior controllable via Kconfig option and a boot parameter. The default will be the current behavior, which is to always use the safe variant. Signed-off-by: Juergen Gross

xen/pv: refactor msr access functions to support safe and unsafe accesses

2022-10-11T08:50:58Z

Refactor and rename xen_read_msr_safe() and xen_write_msr_safe() to support both cases of MSR accesses, safe ones and potentially GP-fault generating ones. This will prepare to no longer swallow GPs silently in xen_read_msr() and xen_write_msr(). Signed-off-by: Juergen Gross Reviewed-by: Jan Beulich Signed-off-by: Juergen Gross

xen/pv: fix vendor checks for pmu emulation

2022-10-11T08:50:55Z

The CPU vendor checks for pmu emulation are rather limited today, as the assumption seems to be that only Intel and AMD are existing and/or supported vendors. Fix that by handling Centaur and Zhaoxin CPUs the same way as Intel, and Hygon the same way as AMD. While at it fix the return type of is_intel_pmu_msr(). Suggested-by: Jan Beulich Signed-off-by: Juergen Gross Reviewed-by: Jan Beulich Signed-off-by: Juergen Gross

xen/pv: add fault recovery control to pmu msr accesses

2022-10-11T08:50:51Z

Today pmu_msr_read() and pmu_msr_write() fall back to the safe variants of read/write MSR in case the MSR access isn't emulated via Xen. Allow the caller to select that faults should not be recovered from by passing NULL for the error pointer. Restructure the code to make it more readable. Signed-off-by: Juergen Gross Reviewed-by: Jan Beulich Signed-off-by: Juergen Gross

Merge tag 'bitmap-6.1-rc1' of https://github.com/norov/linux

2022-10-10T19:49:34Z

Pull bitmap updates from Yury Norov: - Fix unsigned comparison to -1 in CPUMAP_FILE_MAX_BYTES (Phil Auld) - cleanup nr_cpu_ids vs nr_cpumask_bits mess (me) This series cleans that mess and adds new config FORCE_NR_CPUS that allows to optimize cpumask subsystem if the number of CPUs is known at compile-time. - optimize find_bit() functions (me) Reworks find_bit() functions based on new FIND_{FIRST,NEXT}_BIT() macros. - add find_nth_bit() (me) Adds find_nth_bit(), which is ~70 times faster than bitcounting with for_each() loop: for_each_set_bit(bit, mask, size) if (n-- == 0) return bit; Also adds bitmap_weight_and() to let people replace this pattern: tmp = bitmap_alloc(nbits); bitmap_and(tmp, map1, map2, nbits); weight = bitmap_weight(tmp, nbits); bitmap_free(tmp); with a single bitmap_weight_and() call. - repair cpumask_check() (me) After switching cpumask to use nr_cpu_ids, cpumask_check() started generating many false-positive warnings. This series fixes it. - Add for_each_cpu_andnot() and for_each_cpu_andnot() (Valentin Schneider) Extends the API with one more function and applies it in sched/core. * tag 'bitmap-6.1-rc1' of https://github.com/norov/linux: (28 commits) sched/core: Merge cpumask_andnot()+for_each_cpu() into for_each_cpu_andnot() lib/test_cpumask: Add for_each_cpu_and(not) tests cpumask: Introduce for_each_cpu_andnot() lib/find_bit: Introduce find_next_andnot_bit() cpumask: fix checking valid cpu range lib/bitmap: add tests for for_each() loops lib/find: optimize for_each() macros lib/bitmap: introduce for_each_set_bit_wrap() macro lib/find_bit: add find_next{,_and}_bit_wrap cpumask: switch for_each_cpu{,_not} to use for_each_bit() net: fix cpu_max_bits_warn() usage in netif_attrmask_next{,_and} cpumask: add cpumask_nth_{,and,andnot} lib/bitmap: remove bitmap_ord_to_pos lib/bitmap: add tests for find_nth_bit() lib: add find_nth{,_and,_andnot}_bit() lib/bitmap: add bitmap_weight_and() lib/bitmap: don't call __bitmap_weight() in kernel code tools: sync find_bit() implementation lib/find_bit: optimize find_next_bit() functions lib/find_bit: create find_first_zero_bit_le() ...

xen/virtio: enable grant based virtio on x86

2022-10-10T12:31:26Z

Use an x86-specific virtio_check_mem_acc_cb() for Xen in order to setup the correct DMA ops. Signed-off-by: Juergen Gross Reviewed-by: Oleksandr Tyshchenko # common code Reviewed-by: Boris Ostrovsky Signed-off-by: Juergen Gross