On Thu, Nov 22, 2018 at 03:10:57AM +0000, kys@xxxxxxxxxxxxxxxxx wrote: > From: Michael Kelley <mikelley@xxxxxxxxxxxxx> > > Add ARM64-specific code to enable Hyper-V. This code includes: > * Detecting Hyper-V and initializing the guest/Hyper-V interface > * Setting up Hyper-V's synthetic clocks > * Making hypercalls using the HVC instruction > * Setting up VMbus and stimer0 interrupts > * Setting up kexec and crash handlers > This code is architecture dependent code and is mostly driven by > architecture independent code in the VMbus driver in drivers/hv/hv.c > and drivers/hv/vmbus_drv.c. > > This code is built only when CONFIG_HYPERV is enabled. > > Signed-off-by: Michael Kelley <mikelley@xxxxxxxxxxxxx> > Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> > --- > MAINTAINERS | 1 + > arch/arm64/Makefile | 1 + > arch/arm64/hyperv/Makefile | 2 + > arch/arm64/hyperv/hv_hvc.S | 54 +++++ > arch/arm64/hyperv/hv_init.c | 441 +++++++++++++++++++++++++++++++++++ > arch/arm64/hyperv/mshyperv.c | 178 ++++++++++++++ > 6 files changed, 677 insertions(+) > create mode 100644 arch/arm64/hyperv/Makefile > create mode 100644 arch/arm64/hyperv/hv_hvc.S > create mode 100644 arch/arm64/hyperv/hv_init.c > create mode 100644 arch/arm64/hyperv/mshyperv.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index 72f19cef4c48..326eeb32a0cd 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -6837,6 +6837,7 @@ F: arch/x86/kernel/cpu/mshyperv.c > F: arch/x86/hyperv > F: arch/arm64/include/asm/hyperv-tlfs.h > F: arch/arm64/include/asm/mshyperv.h > +F: arch/arm64/hyperv > F: drivers/hid/hid-hyperv.c > F: drivers/hv/ > F: drivers/input/serio/hyperv-keyboard.c > diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile > index 6cb9fc7e9382..ad9ec0579553 100644 > --- a/arch/arm64/Makefile > +++ b/arch/arm64/Makefile > @@ -106,6 +106,7 @@ core-y += arch/arm64/kernel/ arch/arm64/mm/ > core-$(CONFIG_NET) += arch/arm64/net/ > core-$(CONFIG_KVM) += arch/arm64/kvm/ > core-$(CONFIG_XEN) += arch/arm64/xen/ > +core-$(CONFIG_HYPERV) += arch/arm64/hyperv/ > core-$(CONFIG_CRYPTO) += arch/arm64/crypto/ > libs-y := arch/arm64/lib/ $(libs-y) > core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a > diff --git a/arch/arm64/hyperv/Makefile b/arch/arm64/hyperv/Makefile > new file mode 100644 > index 000000000000..988eda55330c > --- /dev/null > +++ b/arch/arm64/hyperv/Makefile > @@ -0,0 +1,2 @@ > +# SPDX-License-Identifier: GPL-2.0 > +obj-y := hv_init.o hv_hvc.o mshyperv.o > diff --git a/arch/arm64/hyperv/hv_hvc.S b/arch/arm64/hyperv/hv_hvc.S > new file mode 100644 > index 000000000000..82636969b4f2 > --- /dev/null > +++ b/arch/arm64/hyperv/hv_hvc.S > @@ -0,0 +1,54 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > + > +/* > + * Microsoft Hyper-V hypervisor invocation routines > + * > + * Copyright (C) 2018, Microsoft, Inc. > + * > + * Author : Michael Kelley <mikelley@xxxxxxxxxxxxx> > + * > + * 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. > + * > + * 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, GOOD TITLE or > + * NON INFRINGEMENT. See the GNU General Public License for more > + * details. > + */ > + > +#include <linux/linkage.h> > + > + .text > +/* > + * Do the HVC instruction. For Hyper-V the argument is always 1. > + * x0 contains the hypercall control value, while additional registers > + * vary depending on the hypercall, and whether the hypercall arguments > + * are in memory or in registers (a "fast" hypercall per the Hyper-V > + * TLFS). When the arguments are in memory x1 is the guest physical > + * address of the input arguments, and x2 is the guest physical > + * address of the output arguments. When the arguments are in > + * registers, the register values depends on the hypercall. Note > + * that this version cannot return any values in registers. > + */ > +ENTRY(hv_do_hvc) > + hvc #1 > + ret > +ENDPROC(hv_do_hvc) > + > +/* > + * This variant of HVC invocation is for hv_get_vpreg and > + * hv_get_vpreg_128. The input parameters are passed in registers > + * along with a pointer in x4 to where the output result should > + * be stored. The output is returned in x15 and x16. x18 is used as > + * scratch space to avoid buildng a stack frame, as Hyper-V does > + * not preserve registers x0-x17. > + */ > +ENTRY(hv_do_hvc_fast_get) > + mov x18, x4 > + hvc #1 > + str x15,[x18] > + str x16,[x18,#8] > + ret > +ENDPROC(hv_do_hvc_fast_get) Why are you not following the ARM SMCCC? It would be /much/ better if you could just follow the standard, which is already implemented by include/linux/smccc.h. Will _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
