diff --git a/xen/arch/x86/guest/hyperv/Makefile b/xen/arch/x86/guest/hyperv/Makefile index 68170109a9..18902c33e9 100644 --- a/xen/arch/x86/guest/hyperv/Makefile +++ b/xen/arch/x86/guest/hyperv/Makefile @@ -1 +1,2 @@ obj-y += hyperv.o +obj-y += tlb.o diff --git a/xen/arch/x86/guest/hyperv/hyperv.c b/xen/arch/x86/guest/hyperv/hyperv.c index 5ad16cf0fe..91a6782cd9 100644 --- a/xen/arch/x86/guest/hyperv/hyperv.c +++ b/xen/arch/x86/guest/hyperv/hyperv.c @@ -33,6 +33,8 @@ DEFINE_PER_CPU_READ_MOSTLY(void *, hv_input_page); DEFINE_PER_CPU_READ_MOSTLY(void *, hv_vp_assist); DEFINE_PER_CPU_READ_MOSTLY(unsigned int, hv_vp_index); +static bool __read_mostly hcall_page_ready; + static uint64_t generate_guest_id(void) { union hv_guest_os_id id = {}; @@ -119,6 +121,8 @@ static void __init setup_hypercall_page(void) BUG_ON(!hypercall_msr.enable); set_fixmap_x(FIX_X_HYPERV_HCALL, mfn << PAGE_SHIFT); + + hcall_page_ready = true; } static int setup_hypercall_pcpu_arg(void) @@ -199,11 +203,24 @@ static void __init e820_fixup(struct e820map *e820) panic("Unable to reserve Hyper-V hypercall range\n"); } +static int flush_tlb(const cpumask_t *mask, const void *va, + unsigned int flags) +{ + if ( !(ms_hyperv.hints & HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED) ) + return -EOPNOTSUPP; + + if ( !hcall_page_ready || !this_cpu(hv_input_page) ) + return -ENXIO; + + return hyperv_flush_tlb(mask, va, flags); +} + static const struct hypervisor_ops __initconstrel ops = { .name = "Hyper-V", .setup = setup, .ap_setup = ap_setup, .e820_fixup = e820_fixup, + .flush_tlb = flush_tlb, }; /* diff --git a/xen/arch/x86/guest/hyperv/private.h b/xen/arch/x86/guest/hyperv/private.h index 956eff831f..509bedaafa 100644 --- a/xen/arch/x86/guest/hyperv/private.h +++ b/xen/arch/x86/guest/hyperv/private.h @@ -22,10 +22,14 @@ #ifndef __XEN_HYPERV_PRIVIATE_H__ #define __XEN_HYPERV_PRIVIATE_H__ +#include #include DECLARE_PER_CPU(void *, hv_input_page); DECLARE_PER_CPU(void *, hv_vp_assist); DECLARE_PER_CPU(unsigned int, hv_vp_index); +int hyperv_flush_tlb(const cpumask_t *mask, const void *va, + unsigned int flags); + #endif /* __XEN_HYPERV_PRIVIATE_H__ */ diff --git a/xen/arch/x86/guest/hyperv/tlb.c b/xen/arch/x86/guest/hyperv/tlb.c new file mode 100644 index 0000000000..48f527229e --- /dev/null +++ b/xen/arch/x86/guest/hyperv/tlb.c @@ -0,0 +1,41 @@ +/****************************************************************************** + * arch/x86/guest/hyperv/tlb.c + * + * Support for TLB management using hypercalls + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; If not, see . + * + * Copyright (c) 2020 Microsoft. + */ + +#include +#include + +#include "private.h" + +int hyperv_flush_tlb(const cpumask_t *mask, const void *va, + unsigned int flags) +{ + return -EOPNOTSUPP; +} + +/* + * Local variables: + * mode: C + * c-file-style: "BSD" + * c-basic-offset: 4 + * tab-width: 4 + * indent-tabs-mode: nil + * End: + */