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Introduce Xen support to ARM64

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Merge tag 'xen-arm64-3.1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/sstabellini/xen into upstream

Introduce Xen support to ARM64

* tag 'xen-arm64-3.1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/sstabellini/xen:
  MAINTAINERS: add myself as arm64/xen maintainer
  arm64/xen: introduce CONFIG_XEN and hypercall.S on ARM64
  arm64/xen: use XEN_IO_PROTO_ABI_ARM on ARM64
  arm64/xen: implement ioremap_cached on arm64
  arm64/xen: introduce asm/xen header files on arm64
  arm/xen: define xen_remap as ioremap_cached
This commit is contained in:
Catalin Marinas 2013-06-12 16:11:35 +01:00
commit d822d2a1e3
15 changed files with 173 additions and 3 deletions
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7
MAINTAINERS
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@ -9105,6 +9105,13 @@ S: Supported
F: arch/arm/xen/
F: arch/arm/include/asm/xen/
XEN HYPERVISOR ARM64
M: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
L: xen-devel@lists.xensource.com (moderated for non-subscribers)
S: Supported
F: arch/arm64/xen/
F: arch/arm64/include/asm/xen/
XEN NETWORK BACKEND DRIVER
M: Ian Campbell <ian.campbell@citrix.com>
L: xen-devel@lists.xensource.com (moderated for non-subscribers)

3
arch/arm/include/asm/xen/page.h
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@ -1,7 +1,6 @@
#ifndef _ASM_ARM_XEN_PAGE_H
#define _ASM_ARM_XEN_PAGE_H
#include <asm/mach/map.h>
#include <asm/page.h>
#include <asm/pgtable.h>
@ -88,6 +87,6 @@ static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
return __set_phys_to_machine(pfn, mfn);
}
#define xen_remap(cookie, size) __arm_ioremap((cookie), (size), MT_MEMORY);
#define xen_remap(cookie, size) ioremap_cached((cookie), (size));
#endif /* _ASM_ARM_XEN_PAGE_H */

10
arch/arm64/Kconfig
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@ -183,6 +183,16 @@ config HW_PERF_EVENTS
source "mm/Kconfig"
config XEN_DOM0
def_bool y
depends on XEN
config XEN
bool "Xen guest support on ARM64 (EXPERIMENTAL)"
depends on ARM64 && OF
help
Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.
endmenu
menu "Boot options"

1
arch/arm64/Makefile
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@ -37,6 +37,7 @@ TEXT_OFFSET := 0x00080000
export TEXT_OFFSET GZFLAGS
core-y += arch/arm64/kernel/ arch/arm64/mm/
core-$(CONFIG_XEN) += arch/arm64/xen/
libs-y := arch/arm64/lib/ $(libs-y)
libs-y += $(LIBGCC)

6
arch/arm64/include/asm/hypervisor.h Normal file
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@ -0,0 +1,6 @@
#ifndef _ASM_ARM64_HYPERVISOR_H
#define _ASM_ARM64_HYPERVISOR_H
#include <asm/xen/hypervisor.h>
#endif

2
arch/arm64/include/asm/io.h
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@ -228,10 +228,12 @@ extern void __iounmap(volatile void __iomem *addr);
#define PROT_DEFAULT (PTE_TYPE_PAGE | PTE_AF | PTE_DIRTY)
#define PROT_DEVICE_nGnRE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_ATTRINDX(MT_DEVICE_nGnRE))
#define PROT_NORMAL_NC (PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL_NC))
#define PROT_NORMAL (PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL))
#define ioremap(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE))
#define ioremap_nocache(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE))
#define ioremap_wc(addr, size) __ioremap((addr), (size), __pgprot(PROT_NORMAL_NC))
#define ioremap_cached(addr, size) __ioremap((addr), (size), __pgprot(PROT_NORMAL))
#define iounmap __iounmap
#define PROT_SECT_DEFAULT (PMD_TYPE_SECT | PMD_SECT_AF)

26
arch/arm64/include/asm/sync_bitops.h Normal file
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@ -0,0 +1,26 @@
#ifndef __ASM_SYNC_BITOPS_H__
#define __ASM_SYNC_BITOPS_H__
#include <asm/bitops.h>
#include <asm/cmpxchg.h>
/* sync_bitops functions are equivalent to the SMP implementation of the
* original functions, independently from CONFIG_SMP being defined.
*
* We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But
* under Xen you might be communicating with a completely external entity
* who might be on another CPU (e.g. two uniprocessor guests communicating
* via event channels and grant tables). So we need a variant of the bit
* ops which are SMP safe even on a UP kernel.
*/
#define sync_set_bit(nr, p) set_bit(nr, p)
#define sync_clear_bit(nr, p) clear_bit(nr, p)
#define sync_change_bit(nr, p) change_bit(nr, p)
#define sync_test_and_set_bit(nr, p) test_and_set_bit(nr, p)
#define sync_test_and_clear_bit(nr, p) test_and_clear_bit(nr, p)
#define sync_test_and_change_bit(nr, p) test_and_change_bit(nr, p)
#define sync_test_bit(nr, addr) test_bit(nr, addr)
#define sync_cmpxchg cmpxchg
#endif

21
arch/arm64/include/asm/xen/events.h Normal file
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@ -0,0 +1,21 @@
#ifndef _ASM_ARM64_XEN_EVENTS_H
#define _ASM_ARM64_XEN_EVENTS_H
#include <asm/ptrace.h>
#include <asm/atomic.h>
enum ipi_vector {
XEN_PLACEHOLDER_VECTOR,
/* Xen IPIs go here */
XEN_NR_IPIS,
};
static inline int xen_irqs_disabled(struct pt_regs *regs)
{
return raw_irqs_disabled_flags((unsigned long) regs->pstate);
}
#define xchg_xen_ulong(ptr, val) xchg((ptr), (val))
#endif /* _ASM_ARM64_XEN_EVENTS_H */

1
arch/arm64/include/asm/xen/hypercall.h Normal file
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@ -0,0 +1 @@
#include <../../arm/include/asm/xen/hypercall.h>

1
arch/arm64/include/asm/xen/hypervisor.h Normal file
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@ -0,0 +1 @@
#include <../../arm/include/asm/xen/hypervisor.h>

1
arch/arm64/include/asm/xen/interface.h Normal file
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@ -0,0 +1 @@
#include <../../arm/include/asm/xen/interface.h>

1
arch/arm64/include/asm/xen/page.h Normal file
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@ -0,0 +1 @@
#include <../../arm/include/asm/xen/page.h>

2
arch/arm64/xen/Makefile Normal file
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@ -0,0 +1,2 @@
xen-arm-y += $(addprefix ../../arm/xen/, enlighten.o grant-table.o)
obj-y := xen-arm.o hypercall.o

92
arch/arm64/xen/hypercall.S Normal file
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@ -0,0 +1,92 @@
/******************************************************************************
* hypercall.S
*
* Xen hypercall wrappers
*
* Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Citrix, 2012
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
/*
* The Xen hypercall calling convention is very similar to the procedure
* call standard for the ARM 64-bit architecture: the first parameter is
* passed in x0, the second in x1, the third in x2, the fourth in x3 and
* the fifth in x4.
*
* The hypercall number is passed in x16.
*
* The return value is in x0.
*
* The hvc ISS is required to be 0xEA1, that is the Xen specific ARM
* hypercall tag.
*
* Parameter structs passed to hypercalls are laid out according to
* the ARM 64-bit EABI standard.
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <xen/interface/xen.h>
#define XEN_IMM 0xEA1
#define HYPERCALL_SIMPLE(hypercall) \
ENTRY(HYPERVISOR_##hypercall) \
mov x16, #__HYPERVISOR_##hypercall; \
hvc XEN_IMM; \
ret; \
ENDPROC(HYPERVISOR_##hypercall)
#define HYPERCALL0 HYPERCALL_SIMPLE
#define HYPERCALL1 HYPERCALL_SIMPLE
#define HYPERCALL2 HYPERCALL_SIMPLE
#define HYPERCALL3 HYPERCALL_SIMPLE
#define HYPERCALL4 HYPERCALL_SIMPLE
#define HYPERCALL5 HYPERCALL_SIMPLE
.text
HYPERCALL2(xen_version);
HYPERCALL3(console_io);
HYPERCALL3(grant_table_op);
HYPERCALL2(sched_op);
HYPERCALL2(event_channel_op);
HYPERCALL2(hvm_op);
HYPERCALL2(memory_op);
HYPERCALL2(physdev_op);
HYPERCALL3(vcpu_op);
ENTRY(privcmd_call)
mov x16, x0
mov x0, x1
mov x1, x2
mov x2, x3
mov x3, x4
mov x4, x5
hvc XEN_IMM
ret
ENDPROC(privcmd_call);

2
include/xen/interface/io/protocols.h
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@ -15,7 +15,7 @@
# define XEN_IO_PROTO_ABI_NATIVE XEN_IO_PROTO_ABI_IA64
#elif defined(__powerpc64__)
# define XEN_IO_PROTO_ABI_NATIVE XEN_IO_PROTO_ABI_POWERPC64
#elif defined(__arm__)
#elif defined(__arm__) || defined(__aarch64__)
# define XEN_IO_PROTO_ABI_NATIVE XEN_IO_PROTO_ABI_ARM
#else
# error arch fixup needed here