mirror of
https://github.com/xen-project/xen.git
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Roger Pau Monné
0570d7f276
Introduce an option to allow selecting a behavior similar to the pre Xen 4.15 one for accesses to MSRs not explicitly handled. Since commit84e848fd7aand322ec7c89faccesses to MSRs not explicitly handled by Xen result in the injection of a #GP to the guest. This is a behavior change since previously a #GP was only injected if accessing the MSR on the real hardware would also trigger a #GP, or if the attempted to be set bits wouldn't match the hardware values (for PV). The reasons for not leaking hardware MSR values and injecting a #GP are fully valid, so the solution proposed here should be considered a temporary workaround until all the required MSRs are properly handled. This seems to be problematic for some guests, so introduce an option to fallback to this kind of legacy behavior without leaking the underlying MSR values to the guest. When the option is set, for both PV and HVM don't inject a #GP to the guest on MSR read if reading the underlying MSR doesn't result in a #GP, do the same for writes and simply discard the value to be written on that case. Note that for guests restored or migrated from previous Xen versions the option is enabled by default, in order to keep a compatible MSR behavior. Such compatibility is done at the libxl layer, to avoid higher-level toolstacks from having to know the details about this flag. Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Acked-by: Christian Lindig <christian.lindig@citrix.com> Reviewed-by: Ian Jackson <iwj@xenproject.org> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Release-Acked-by: Ian Jackson <iwj@xenproject.org>
104 lines
4.1 KiB
C
104 lines
4.1 KiB
C
/*
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* Copyright (C) 2012 Citrix Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; version 2.1 only. with the special
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* exception on linking described in file LICENSE.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*/
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#ifndef LIBXL_ARCH_H
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#define LIBXL_ARCH_H
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/* fill the arch specific configuration for the domain */
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_hidden
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int libxl__arch_domain_prepare_config(libxl__gc *gc,
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libxl_domain_config *d_config,
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struct xen_domctl_createdomain *config);
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/* save the arch specific configuration for the domain */
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_hidden
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int libxl__arch_domain_save_config(libxl__gc *gc,
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libxl_domain_config *d_config,
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libxl__domain_build_state *state,
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const struct xen_domctl_createdomain *config);
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/* arch specific internal domain creation function */
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_hidden
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int libxl__arch_domain_create(libxl__gc *gc,
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libxl_domain_config *d_config,
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libxl__domain_build_state *state,
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uint32_t domid);
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/* setup arch specific hardware description, i.e. DTB on ARM */
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_hidden
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int libxl__arch_domain_init_hw_description(libxl__gc *gc,
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libxl_domain_build_info *info,
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libxl__domain_build_state *state,
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struct xc_dom_image *dom);
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/* finalize arch specific hardware description. */
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_hidden
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int libxl__arch_domain_finalise_hw_description(libxl__gc *gc,
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uint32_t domid,
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libxl_domain_config *d_config,
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struct xc_dom_image *dom);
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/* perform any pending hardware initialization */
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_hidden
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int libxl__arch_build_dom_finish(libxl__gc *gc,
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libxl_domain_build_info *info,
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struct xc_dom_image *dom,
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libxl__domain_build_state *state);
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/* build vNUMA vmemrange with arch specific information */
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_hidden
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int libxl__arch_vnuma_build_vmemrange(libxl__gc *gc,
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uint32_t domid,
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libxl_domain_build_info *b_info,
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libxl__domain_build_state *state);
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/* arch specific irq map function */
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_hidden
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int libxl__arch_domain_map_irq(libxl__gc *gc, uint32_t domid, int irq);
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_hidden
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void libxl__arch_domain_create_info_setdefault(libxl__gc *gc,
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libxl_domain_create_info *c_info);
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_hidden
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void libxl__arch_domain_build_info_setdefault(libxl__gc *gc,
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libxl_domain_build_info *b_info);
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_hidden
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int libxl__arch_passthrough_mode_setdefault(libxl__gc *gc,
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uint32_t domid /* for logging, only */,
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libxl_domain_config *d_config,
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const libxl_physinfo *physinfo);
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_hidden
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int libxl__arch_extra_memory(libxl__gc *gc,
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const libxl_domain_build_info *info,
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uint64_t *out);
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_hidden
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void libxl__arch_update_domain_config(libxl__gc *gc,
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libxl_domain_config *dst,
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const libxl_domain_config *src);
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#if defined(__i386__) || defined(__x86_64__)
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#define LAPIC_BASE_ADDRESS 0xfee00000
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#define ACPI_INFO_PHYSICAL_ADDRESS 0xfc000000
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int libxl__dom_load_acpi(libxl__gc *gc,
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const libxl_domain_build_info *b_info,
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struct xc_dom_image *dom);
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#endif
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#endif
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