forked from Minki/linux
2ffd9e33ce
Hyper-V host can suggest us to use hypercall for doing remote TLB flush,
this is supposed to work faster than IPIs.
Implementation details: to do HvFlushVirtualAddress{Space,List} hypercalls
we need to put the input somewhere in memory and we don't really want to
have memory allocation on each call so we pre-allocate per cpu memory areas
on boot.
pv_ops patching is happening very early so we need to separate
hyperv_setup_mmu_ops() and hyper_alloc_mmu().
It is possible and easy to implement local TLB flushing too and there is
even a hint for that. However, I don't see a room for optimization on the
host side as both hypercall and native tlb flush will result in vmexit. The
hint is also not set on modern Hyper-V versions.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Jork Loeser <Jork.Loeser@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Simon Xiao <sixiao@microsoft.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: devel@linuxdriverproject.org
Link: http://lkml.kernel.org/r/20170802160921.21791-8-vkuznets@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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| .. | ||
| a.out.h | ||
| auxvec.h | ||
| bitsperlong.h | ||
| boot.h | ||
| bootparam.h | ||
| byteorder.h | ||
| debugreg.h | ||
| e820.h | ||
| errno.h | ||
| fcntl.h | ||
| hw_breakpoint.h | ||
| hwcap2.h | ||
| hyperv.h | ||
| ioctl.h | ||
| ioctls.h | ||
| ipcbuf.h | ||
| ist.h | ||
| Kbuild | ||
| kvm_para.h | ||
| kvm_perf.h | ||
| kvm.h | ||
| ldt.h | ||
| mce.h | ||
| mman.h | ||
| msgbuf.h | ||
| msr.h | ||
| mtrr.h | ||
| param.h | ||
| perf_regs.h | ||
| poll.h | ||
| posix_types_32.h | ||
| posix_types_64.h | ||
| posix_types_x32.h | ||
| posix_types.h | ||
| prctl.h | ||
| processor-flags.h | ||
| ptrace-abi.h | ||
| ptrace.h | ||
| resource.h | ||
| sembuf.h | ||
| setup.h | ||
| shmbuf.h | ||
| sigcontext32.h | ||
| sigcontext.h | ||
| siginfo.h | ||
| signal.h | ||
| socket.h | ||
| sockios.h | ||
| stat.h | ||
| statfs.h | ||
| svm.h | ||
| swab.h | ||
| termbits.h | ||
| termios.h | ||
| types.h | ||
| ucontext.h | ||
| unistd.h | ||
| vm86.h | ||
| vmx.h | ||
| vsyscall.h | ||