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x86/shim: Kconfig and command line options
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Signed-off-by: Wei Liu <wei.liu2@citrix.com>
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Andrew Cooper authored and Wei Liu committed
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@@ -1473,6 +1473,17 @@ do; there may be other custom operating systems which do. If you're
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certain you don't plan on having PV guests which use this feature,
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turning it off can reduce the attack surface.
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### pv-shim (x86)
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> `= <boolean>`
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> Default: `false`
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This option is intended for use by a toolstack, when choosing to run a PV
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guest compatibly inside an HVM container.
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In this mode, the kernel and initrd passed as modules to the hypervisor are
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constructed into a plain unprivileged PV domain.
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### rcu-idle-timer-period-ms
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> `= <integer>`
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@@ -133,6 +133,28 @@ config PVH_GUEST
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---help---
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Support booting using the PVH ABI.
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If unsure, say N.
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config PV_SHIM
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def_bool n
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prompt "PV Shim"
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depends on PV && XEN_GUEST
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---help---
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Build Xen with a mode which acts as a shim to allow PV guest to run
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in an HVM/PVH container. This mode can only be enabled with command
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line option.
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If unsure, say N.
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config PV_SHIM_EXCLUSIVE
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def_bool n
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prompt "PV Shim Exclusive"
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depends on PV_SHIM
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---help---
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Build Xen in a way which unconditionally assumes PV_SHIM mode. This
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option is only intended for use when building a dedicated PV Shim
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firmware, and will not function correctly in other scenarios.
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If unsure, say N.
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endmenu
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@@ -11,6 +11,7 @@ obj-y += iret.o
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obj-y += misc-hypercalls.o
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obj-y += mm.o
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obj-y += ro-page-fault.o
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obj-$(CONFIG_PV_SHIM) += shim.o
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obj-y += traps.o
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obj-bin-y += dom0_build.init.o
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@@ -0,0 +1,39 @@
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/******************************************************************************
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* arch/x86/pv/shim.c
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*
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* Functionaltiy for PV Shim mode
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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 General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright (c) 2017 Citrix Systems Ltd.
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*/
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#include <xen/init.h>
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#include <xen/types.h>
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#include <asm/apic.h>
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#ifndef CONFIG_PV_SHIM_EXCLUSIVE
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bool pv_shim;
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boolean_param("pv-shim", pv_shim);
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#endif
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/*
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* Local variables:
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* mode: C
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* c-file-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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@@ -22,6 +22,7 @@
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#include <asm/guest/hypercall.h>
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#include <asm/guest/pvh-boot.h>
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#include <asm/guest/xen.h>
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#include <asm/pv/shim.h>
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#endif /* __X86_GUEST_H__ */
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@@ -0,0 +1,42 @@
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/******************************************************************************
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* asm-x86/guest/shim.h
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms and conditions of the GNU General Public
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* License, version 2, as published by the Free Software Foundation.
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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 GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright (c) 2017 Citrix Systems Ltd.
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*/
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#ifndef __X86_PV_SHIM_H__
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#define __X86_PV_SHIM_H__
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#include <xen/types.h>
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#if defined(CONFIG_PV_SHIM_EXCLUSIVE)
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# define pv_shim 1
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#elif defined(CONFIG_PV_SHIM)
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extern bool pv_shim;
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#else
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# define pv_shim 0
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#endif /* CONFIG_PV_SHIM{,_EXCLUSIVE} */
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#endif /* __X86_PV_SHIM_H__ */
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/*
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* Local variables:
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* mode: C
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* c-file-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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