Commit-ID: ab7ff471aa5db670197070760f022622793da7e5 Gitweb: https://git.kernel.org/tip/ab7ff471aa5db670197070760f022622793da7e5 Author: Marcelo Henrique Cerri <[email protected]> AuthorDate: Thu, 5 Oct 2017 10:34:29 -0300 Committer: Ingo Molnar <[email protected]> CommitDate: Tue, 10 Oct 2017 12:54:56 +0200
x86/hyperv: Fix hypercalls with extended CPU ranges for TLB flushing Do not consider the fixed size of hv_vp_set when passing the variable header size to hv_do_rep_hypercall(). The Hyper-V hypervisor specification states that for a hypercall with a variable header only the size of the variable portion should be supplied via the input control. For HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX/LIST_EX calls that means the fixed portion of hv_vp_set should not be considered. That fixes random failures of some applications that are unexpectedly killed with SIGBUS or SIGSEGV. Signed-off-by: Marcelo Henrique Cerri <[email protected]> Cc: Dexuan Cui <[email protected]> Cc: Haiyang Zhang <[email protected]> Cc: Jork Loeser <[email protected]> Cc: Josh Poulson <[email protected]> Cc: K. Y. Srinivasan <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Simon Xiao <[email protected]> Cc: Stephen Hemminger <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Vitaly Kuznetsov <[email protected]> Cc: [email protected] Fixes: 628f54cc6451 ("x86/hyper-v: Support extended CPU ranges for TLB flush hypercalls") Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- arch/x86/hyperv/mmu.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/x86/hyperv/mmu.c b/arch/x86/hyperv/mmu.c index f21cebb..9cc9e1c 100644 --- a/arch/x86/hyperv/mmu.c +++ b/arch/x86/hyperv/mmu.c @@ -251,18 +251,18 @@ static void hyperv_flush_tlb_others_ex(const struct cpumask *cpus, flush->flags |= HV_FLUSH_NON_GLOBAL_MAPPINGS_ONLY; status = hv_do_rep_hypercall( HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX, - 0, nr_bank + 2, flush, NULL); + 0, nr_bank, flush, NULL); } else if (info->end && ((info->end - info->start)/HV_TLB_FLUSH_UNIT) > max_gvas) { status = hv_do_rep_hypercall( HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX, - 0, nr_bank + 2, flush, NULL); + 0, nr_bank, flush, NULL); } else { gva_n = fill_gva_list(flush->gva_list, nr_bank, info->start, info->end); status = hv_do_rep_hypercall( HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX, - gva_n, nr_bank + 2, flush, NULL); + gva_n, nr_bank, flush, NULL); } local_irq_restore(flags);
