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Message-ID: <1370273624-26976-5-git-send-email-stefano.stabellini@eu.citrix.com> Date: Mon, 3 Jun 2013 16:33:44 +0100 From: Stefano Stabellini <stefano.stabellini@...citrix.com> To: <linux-arm-kernel@...ts.infradead.org> CC: <linux-kernel@...r.kernel.org>, <xen-devel@...ts.xensource.com>, <Stefano.Stabellini@...citrix.com>, <will.deacon@....com>, <catalin.marinas@....com>, <Ian.Campbell@...rix.com>, <konrad.wilk@...cle.com>, Stefano Stabellini <stefano.stabellini@...citrix.com> Subject: [PATCH v2 5/5] arm64/xen: introduce CONFIG_XEN and hypercall.S on ARM64 Introduce CONFIG_XEN and the implementation of hypercall.S (that is the only ARMv8 specific code in Xen support for ARM). Compile enlighten.c and grant_table.c from arch/arm. Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com> Changes in v2: - remove depends on !GENERIC_ATOMIC64; - compile enlighten.c and grant_table.c from arch/arm directly; - fix the privcmd implementation: according to the aarch64 procedure call ABI the first 7 parameters are passed on registers so we don't need to push/pop anything. --- arch/arm64/Kconfig | 10 +++++ arch/arm64/Makefile | 1 + arch/arm64/xen/Makefile | 2 + arch/arm64/xen/hypercall.S | 94 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 107 insertions(+), 0 deletions(-) create mode 100644 arch/arm64/xen/Makefile create mode 100644 arch/arm64/xen/hypercall.S diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 56b3f6d..b5d6ada 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -182,6 +182,16 @@ 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" diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index c95c5cb..79dd13d 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -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) diff --git a/arch/arm64/xen/Makefile b/arch/arm64/xen/Makefile new file mode 100644 index 0000000..be24040 --- /dev/null +++ b/arch/arm64/xen/Makefile @@ -0,0 +1,2 @@ +xen-arm-y += $(addprefix ../../arm/xen/, enlighten.o grant-table.o) +obj-y := xen-arm.o hypercall.o diff --git a/arch/arm64/xen/hypercall.S b/arch/arm64/xen/hypercall.S new file mode 100644 index 0000000..8e362cc --- /dev/null +++ b/arch/arm64/xen/hypercall.S @@ -0,0 +1,94 @@ +/****************************************************************************** + * hypercall.S + * + * Xen hypercall wrappers + * + * Stefano Stabellini <stefano.stabellini@...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 ARM AEBI + * procedure calling convention: the first paramter is passed in x0, the + * second in x1, the third in x2 and the fourth in x3. Considering that + * Xen hypercalls have 5 arguments at most, the fifth paramter is passed + * in rx, differently from the procedure calling convention of using the + * stack for that case. + * + * 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 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); -- 1.7.2.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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