From: Michael Kelley <mikelley@microsoft.com> To: will@kernel.org, ardb@kernel.org, arnd@arndb.de, catalin.marinas@arm.com, mark.rutland@arm.com, maz@kernel.org, linux-arm-kernel@lists.infradead.org, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-efi@vger.kernel.org, linux-arch@vger.kernel.org, wei.liu@kernel.org, vkuznets@redhat.com, kys@microsoft.com Cc: mikelley@microsoft.com, sunilmut@microsoft.com, boqun.feng@gmail.com Subject: [PATCH v7 03/10] arm64: hyperv: Add hypercall and register access functions Date: Mon, 24 Aug 2020 09:46:16 -0700 [thread overview] Message-ID: <1598287583-71762-4-git-send-email-mikelley@microsoft.com> (raw) In-Reply-To: <1598287583-71762-1-git-send-email-mikelley@microsoft.com> Add ARM64-specific code to make Hyper-V hypercalls and to access virtual processor synthetic registers via hypercalls. Hypercalls follow the SMC Calling Convention spec v1.1. This code is architecture dependent and is mostly driven by architecture independent code in the VMbus driver and the Hyper-V timer clocksource driver. This code is built only when CONFIG_HYPERV is enabled. Signed-off-by: Michael Kelley <mikelley@microsoft.com> --- MAINTAINERS | 1 + arch/arm64/Kbuild | 1 + arch/arm64/hyperv/Makefile | 2 + arch/arm64/hyperv/hv_core.c | 170 ++++++++++++++++++++++++++++++++++++++ arch/arm64/include/asm/mshyperv.h | 17 ++++ 5 files changed, 191 insertions(+) create mode 100644 arch/arm64/hyperv/Makefile create mode 100644 arch/arm64/hyperv/hv_core.c diff --git a/MAINTAINERS b/MAINTAINERS index 803bade..f67d208 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -8054,6 +8054,7 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git F: Documentation/ABI/stable/sysfs-bus-vmbus F: Documentation/ABI/testing/debugfs-hyperv F: Documentation/networking/device_drivers/ethernet/microsoft/netvsc.rst +F: arch/arm64/hyperv F: arch/arm64/include/asm/hyperv-tlfs.h F: arch/arm64/include/asm/mshyperv.h F: arch/x86/hyperv diff --git a/arch/arm64/Kbuild b/arch/arm64/Kbuild index d646582..7a37608 100644 --- a/arch/arm64/Kbuild +++ b/arch/arm64/Kbuild @@ -3,4 +3,5 @@ obj-y += kernel/ mm/ obj-$(CONFIG_NET) += net/ obj-$(CONFIG_KVM) += kvm/ obj-$(CONFIG_XEN) += xen/ +obj-$(subst m,y,$(CONFIG_HYPERV)) += hyperv/ obj-$(CONFIG_CRYPTO) += crypto/ diff --git a/arch/arm64/hyperv/Makefile b/arch/arm64/hyperv/Makefile new file mode 100644 index 0000000..1697d30 --- /dev/null +++ b/arch/arm64/hyperv/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-y := hv_core.o diff --git a/arch/arm64/hyperv/hv_core.c b/arch/arm64/hyperv/hv_core.c new file mode 100644 index 0000000..9b35011 --- /dev/null +++ b/arch/arm64/hyperv/hv_core.c @@ -0,0 +1,170 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Initialization of the interface with Microsoft's Hyper-V hypervisor, + * and various low level utility routines for interacting with Hyper-V. + * + * Copyright (C) 2019, Microsoft, Inc. + * + * Author : Michael Kelley <mikelley@microsoft.com> + */ + + +#include <linux/types.h> +#include <linux/log2.h> +#include <linux/version.h> +#include <linux/export.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/hyperv.h> +#include <linux/arm-smccc.h> +#include <asm-generic/bug.h> +#include <asm/hyperv-tlfs.h> +#include <asm/mshyperv.h> + + +/* + * hv_do_hypercall- Invoke the specified hypercall + */ +u64 hv_do_hypercall(u64 control, void *input, void *output) +{ + u64 input_address; + u64 output_address; + struct arm_smccc_res res; + + input_address = input ? virt_to_phys(input) : 0; + output_address = output ? virt_to_phys(output) : 0; + + arm_smccc_1_1_hvc(HV_FUNC_ID, control, + input_address, output_address, &res); + return res.a0; +} +EXPORT_SYMBOL_GPL(hv_do_hypercall); + +/* + * hv_do_fast_hypercall8 -- Invoke the specified hypercall + * with arguments in registers instead of physical memory. + * Avoids the overhead of virt_to_phys for simple hypercalls. + */ + +u64 hv_do_fast_hypercall8(u16 code, u64 input) +{ + u64 control; + struct arm_smccc_res res; + + control = (u64)code | HV_HYPERCALL_FAST_BIT; + + arm_smccc_1_1_hvc(HV_FUNC_ID, control, input, &res); + return res.a0; +} +EXPORT_SYMBOL_GPL(hv_do_fast_hypercall8); + + +/* + * Set a single VP register to a 64-bit value. + */ +void hv_set_vpreg(u32 msr, u64 value) +{ + struct arm_smccc_res res; + + arm_smccc_1_1_hvc( + HV_FUNC_ID, + HVCALL_SET_VP_REGISTERS | HV_HYPERCALL_FAST_BIT | + HV_HYPERCALL_REP_COMP_1, + HV_PARTITION_ID_SELF, + HV_VP_INDEX_SELF, + msr, + 0, + value, + 0, + &res); + + /* + * Something is fundamentally broken in the hypervisor if + * setting a VP register fails. There's really no way to + * continue as a guest VM, so panic. + */ + BUG_ON((res.a0 & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS); +} +EXPORT_SYMBOL_GPL(hv_set_vpreg); + +/* + * Get the value of a single VP register. One version + * returns just 64 bits and another returns the full 128 bits. + * The two versions are separate to avoid complicating the + * calling sequence for the more frequently used 64 bit version. + */ + +static void __hv_get_vpreg_128(u32 msr, struct hv_get_vp_registers_output *res) +{ + struct hv_get_vp_registers_input *input; + u64 status; + + /* + * Allocate a power of 2 size so alignment to that size is + * guaranteed, since the hypercall input area must not cross + * a page boundary. + */ + + input = kzalloc(roundup_pow_of_two(sizeof(input->header) + + sizeof(input->element[0])), GFP_ATOMIC); + + input->header.partitionid = HV_PARTITION_ID_SELF; + input->header.vpindex = HV_VP_INDEX_SELF; + input->header.inputvtl = 0; + input->element[0].name0 = msr; + input->element[0].name1 = 0; + + + status = hv_do_hypercall( + HVCALL_GET_VP_REGISTERS | HV_HYPERCALL_REP_COMP_1, + input, res); + + /* + * Something is fundamentally broken in the hypervisor if + * getting a VP register fails. There's really no way to + * continue as a guest VM, so panic. + */ + BUG_ON((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS); + + kfree(input); +} + +u64 hv_get_vpreg(u32 msr) +{ + struct hv_get_vp_registers_output *output; + u64 result; + + /* + * Allocate a power of 2 size so alignment to that size is + * guaranteed, since the hypercall output area must not cross + * a page boundary. + */ + output = kmalloc(roundup_pow_of_two(sizeof(*output)), GFP_ATOMIC); + + __hv_get_vpreg_128(msr, output); + + result = output->as64.low; + kfree(output); + return result; +} +EXPORT_SYMBOL_GPL(hv_get_vpreg); + +void hv_get_vpreg_128(u32 msr, struct hv_get_vp_registers_output *res) +{ + struct hv_get_vp_registers_output *output; + + /* + * Allocate a power of 2 size so alignment to that size is + * guaranteed, since the hypercall output area must not cross + * a page boundary. + */ + output = kmalloc(roundup_pow_of_two(sizeof(*output)), GFP_ATOMIC); + + __hv_get_vpreg_128(msr, output); + + res->as64.low = output->as64.low; + res->as64.high = output->as64.high; + kfree(output); +} +EXPORT_SYMBOL_GPL(hv_get_vpreg_128); diff --git a/arch/arm64/include/asm/mshyperv.h b/arch/arm64/include/asm/mshyperv.h index 6b1f26c..b17d4a1 100644 --- a/arch/arm64/include/asm/mshyperv.h +++ b/arch/arm64/include/asm/mshyperv.h @@ -26,6 +26,14 @@ #include <linux/arm-smccc.h> #include <asm/hyperv-tlfs.h> +/* + * Declare calls to get and set Hyper-V VP register values on ARM64, which + * requires a hypercall. + */ +extern void hv_set_vpreg(u32 reg, u64 value); +extern u64 hv_get_vpreg(u32 reg); +extern void hv_get_vpreg_128(u32 reg, struct hv_get_vp_registers_output *result); + /* Access various Hyper-V synthetic registers */ static inline void hv_set_simp(u64 val) { @@ -71,6 +79,15 @@ static inline void hv_set_synint_state(u32 sint_num, u64 val) #define hv_get_synint_state(sint_num, val) \ (val = hv_get_vpreg(HV_REGISTER_SINT0 + sint_num)) + +/* SMCCC hypercall parameters */ +#define HV_SMCCC_FUNC_NUMBER 1 +#define HV_FUNC_ID ARM_SMCCC_CALL_VAL( \ + ARM_SMCCC_STD_CALL, \ + ARM_SMCCC_SMC_64, \ + ARM_SMCCC_OWNER_VENDOR_HYP, \ + HV_SMCCC_FUNC_NUMBER) + #include <asm-generic/mshyperv.h> #endif -- 1.8.3.1
WARNING: multiple messages have this Message-ID (diff)
From: Michael Kelley <mikelley@microsoft.com> To: will@kernel.org, ardb@kernel.org, arnd@arndb.de, catalin.marinas@arm.com, mark.rutland@arm.com, maz@kernel.org, linux-arm-kernel@lists.infradead.org, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-efi@vger.kernel.org, linux-arch@vger.kernel.org, wei.liu@kernel.org, vkuznets@redhat.com, kys@microsoft.com Cc: sunilmut@microsoft.com, boqun.feng@gmail.com, mikelley@microsoft.com Subject: [PATCH v7 03/10] arm64: hyperv: Add hypercall and register access functions Date: Mon, 24 Aug 2020 09:46:16 -0700 [thread overview] Message-ID: <1598287583-71762-4-git-send-email-mikelley@microsoft.com> (raw) In-Reply-To: <1598287583-71762-1-git-send-email-mikelley@microsoft.com> Add ARM64-specific code to make Hyper-V hypercalls and to access virtual processor synthetic registers via hypercalls. Hypercalls follow the SMC Calling Convention spec v1.1. This code is architecture dependent and is mostly driven by architecture independent code in the VMbus driver and the Hyper-V timer clocksource driver. This code is built only when CONFIG_HYPERV is enabled. Signed-off-by: Michael Kelley <mikelley@microsoft.com> --- MAINTAINERS | 1 + arch/arm64/Kbuild | 1 + arch/arm64/hyperv/Makefile | 2 + arch/arm64/hyperv/hv_core.c | 170 ++++++++++++++++++++++++++++++++++++++ arch/arm64/include/asm/mshyperv.h | 17 ++++ 5 files changed, 191 insertions(+) create mode 100644 arch/arm64/hyperv/Makefile create mode 100644 arch/arm64/hyperv/hv_core.c diff --git a/MAINTAINERS b/MAINTAINERS index 803bade..f67d208 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -8054,6 +8054,7 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git F: Documentation/ABI/stable/sysfs-bus-vmbus F: Documentation/ABI/testing/debugfs-hyperv F: Documentation/networking/device_drivers/ethernet/microsoft/netvsc.rst +F: arch/arm64/hyperv F: arch/arm64/include/asm/hyperv-tlfs.h F: arch/arm64/include/asm/mshyperv.h F: arch/x86/hyperv diff --git a/arch/arm64/Kbuild b/arch/arm64/Kbuild index d646582..7a37608 100644 --- a/arch/arm64/Kbuild +++ b/arch/arm64/Kbuild @@ -3,4 +3,5 @@ obj-y += kernel/ mm/ obj-$(CONFIG_NET) += net/ obj-$(CONFIG_KVM) += kvm/ obj-$(CONFIG_XEN) += xen/ +obj-$(subst m,y,$(CONFIG_HYPERV)) += hyperv/ obj-$(CONFIG_CRYPTO) += crypto/ diff --git a/arch/arm64/hyperv/Makefile b/arch/arm64/hyperv/Makefile new file mode 100644 index 0000000..1697d30 --- /dev/null +++ b/arch/arm64/hyperv/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-y := hv_core.o diff --git a/arch/arm64/hyperv/hv_core.c b/arch/arm64/hyperv/hv_core.c new file mode 100644 index 0000000..9b35011 --- /dev/null +++ b/arch/arm64/hyperv/hv_core.c @@ -0,0 +1,170 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Initialization of the interface with Microsoft's Hyper-V hypervisor, + * and various low level utility routines for interacting with Hyper-V. + * + * Copyright (C) 2019, Microsoft, Inc. + * + * Author : Michael Kelley <mikelley@microsoft.com> + */ + + +#include <linux/types.h> +#include <linux/log2.h> +#include <linux/version.h> +#include <linux/export.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/hyperv.h> +#include <linux/arm-smccc.h> +#include <asm-generic/bug.h> +#include <asm/hyperv-tlfs.h> +#include <asm/mshyperv.h> + + +/* + * hv_do_hypercall- Invoke the specified hypercall + */ +u64 hv_do_hypercall(u64 control, void *input, void *output) +{ + u64 input_address; + u64 output_address; + struct arm_smccc_res res; + + input_address = input ? virt_to_phys(input) : 0; + output_address = output ? virt_to_phys(output) : 0; + + arm_smccc_1_1_hvc(HV_FUNC_ID, control, + input_address, output_address, &res); + return res.a0; +} +EXPORT_SYMBOL_GPL(hv_do_hypercall); + +/* + * hv_do_fast_hypercall8 -- Invoke the specified hypercall + * with arguments in registers instead of physical memory. + * Avoids the overhead of virt_to_phys for simple hypercalls. + */ + +u64 hv_do_fast_hypercall8(u16 code, u64 input) +{ + u64 control; + struct arm_smccc_res res; + + control = (u64)code | HV_HYPERCALL_FAST_BIT; + + arm_smccc_1_1_hvc(HV_FUNC_ID, control, input, &res); + return res.a0; +} +EXPORT_SYMBOL_GPL(hv_do_fast_hypercall8); + + +/* + * Set a single VP register to a 64-bit value. + */ +void hv_set_vpreg(u32 msr, u64 value) +{ + struct arm_smccc_res res; + + arm_smccc_1_1_hvc( + HV_FUNC_ID, + HVCALL_SET_VP_REGISTERS | HV_HYPERCALL_FAST_BIT | + HV_HYPERCALL_REP_COMP_1, + HV_PARTITION_ID_SELF, + HV_VP_INDEX_SELF, + msr, + 0, + value, + 0, + &res); + + /* + * Something is fundamentally broken in the hypervisor if + * setting a VP register fails. There's really no way to + * continue as a guest VM, so panic. + */ + BUG_ON((res.a0 & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS); +} +EXPORT_SYMBOL_GPL(hv_set_vpreg); + +/* + * Get the value of a single VP register. One version + * returns just 64 bits and another returns the full 128 bits. + * The two versions are separate to avoid complicating the + * calling sequence for the more frequently used 64 bit version. + */ + +static void __hv_get_vpreg_128(u32 msr, struct hv_get_vp_registers_output *res) +{ + struct hv_get_vp_registers_input *input; + u64 status; + + /* + * Allocate a power of 2 size so alignment to that size is + * guaranteed, since the hypercall input area must not cross + * a page boundary. + */ + + input = kzalloc(roundup_pow_of_two(sizeof(input->header) + + sizeof(input->element[0])), GFP_ATOMIC); + + input->header.partitionid = HV_PARTITION_ID_SELF; + input->header.vpindex = HV_VP_INDEX_SELF; + input->header.inputvtl = 0; + input->element[0].name0 = msr; + input->element[0].name1 = 0; + + + status = hv_do_hypercall( + HVCALL_GET_VP_REGISTERS | HV_HYPERCALL_REP_COMP_1, + input, res); + + /* + * Something is fundamentally broken in the hypervisor if + * getting a VP register fails. There's really no way to + * continue as a guest VM, so panic. + */ + BUG_ON((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS); + + kfree(input); +} + +u64 hv_get_vpreg(u32 msr) +{ + struct hv_get_vp_registers_output *output; + u64 result; + + /* + * Allocate a power of 2 size so alignment to that size is + * guaranteed, since the hypercall output area must not cross + * a page boundary. + */ + output = kmalloc(roundup_pow_of_two(sizeof(*output)), GFP_ATOMIC); + + __hv_get_vpreg_128(msr, output); + + result = output->as64.low; + kfree(output); + return result; +} +EXPORT_SYMBOL_GPL(hv_get_vpreg); + +void hv_get_vpreg_128(u32 msr, struct hv_get_vp_registers_output *res) +{ + struct hv_get_vp_registers_output *output; + + /* + * Allocate a power of 2 size so alignment to that size is + * guaranteed, since the hypercall output area must not cross + * a page boundary. + */ + output = kmalloc(roundup_pow_of_two(sizeof(*output)), GFP_ATOMIC); + + __hv_get_vpreg_128(msr, output); + + res->as64.low = output->as64.low; + res->as64.high = output->as64.high; + kfree(output); +} +EXPORT_SYMBOL_GPL(hv_get_vpreg_128); diff --git a/arch/arm64/include/asm/mshyperv.h b/arch/arm64/include/asm/mshyperv.h index 6b1f26c..b17d4a1 100644 --- a/arch/arm64/include/asm/mshyperv.h +++ b/arch/arm64/include/asm/mshyperv.h @@ -26,6 +26,14 @@ #include <linux/arm-smccc.h> #include <asm/hyperv-tlfs.h> +/* + * Declare calls to get and set Hyper-V VP register values on ARM64, which + * requires a hypercall. + */ +extern void hv_set_vpreg(u32 reg, u64 value); +extern u64 hv_get_vpreg(u32 reg); +extern void hv_get_vpreg_128(u32 reg, struct hv_get_vp_registers_output *result); + /* Access various Hyper-V synthetic registers */ static inline void hv_set_simp(u64 val) { @@ -71,6 +79,15 @@ static inline void hv_set_synint_state(u32 sint_num, u64 val) #define hv_get_synint_state(sint_num, val) \ (val = hv_get_vpreg(HV_REGISTER_SINT0 + sint_num)) + +/* SMCCC hypercall parameters */ +#define HV_SMCCC_FUNC_NUMBER 1 +#define HV_FUNC_ID ARM_SMCCC_CALL_VAL( \ + ARM_SMCCC_STD_CALL, \ + ARM_SMCCC_SMC_64, \ + ARM_SMCCC_OWNER_VENDOR_HYP, \ + HV_SMCCC_FUNC_NUMBER) + #include <asm-generic/mshyperv.h> #endif -- 1.8.3.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-08-24 16:54 UTC|newest] Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-08-24 16:46 [PATCH v7 00/10] Enable Linux guests on Hyper-V on ARM64 Michael Kelley 2020-08-24 16:46 ` Michael Kelley 2020-08-24 16:46 ` [PATCH v7 01/10] arm/arm64: smccc-1.1: Add vendor specific owner definition Michael Kelley 2020-08-24 16:46 ` Michael Kelley 2020-08-24 16:46 ` [PATCH v7 02/10] arm64: hyperv: Add core Hyper-V include files Michael Kelley 2020-08-24 16:46 ` Michael Kelley 2020-08-24 18:38 ` Arnd Bergmann 2020-08-24 18:38 ` Arnd Bergmann 2020-08-24 16:46 ` Michael Kelley [this message] 2020-08-24 16:46 ` [PATCH v7 03/10] arm64: hyperv: Add hypercall and register access functions Michael Kelley 2020-08-24 16:46 ` [PATCH v7 04/10] arm64: hyperv: Add memory alloc/free functions for Hyper-V size pages Michael Kelley 2020-08-24 16:46 ` Michael Kelley 2020-08-24 16:46 ` [PATCH v7 05/10] arm64: hyperv: Add interrupt handlers for VMbus and stimer Michael Kelley 2020-08-24 16:46 ` Michael Kelley 2020-08-24 18:54 ` Arnd Bergmann 2020-08-24 18:54 ` Arnd Bergmann 2020-08-25 22:04 ` Michael Kelley 2020-08-25 22:04 ` Michael Kelley 2020-08-26 7:14 ` Arnd Bergmann 2020-08-26 7:14 ` Arnd Bergmann 2020-08-24 16:46 ` [PATCH v7 06/10] arm64: hyperv: Add kexec and panic handlers Michael Kelley 2020-08-24 16:46 ` Michael Kelley 2020-08-24 16:46 ` [PATCH v7 07/10] arm64: hyperv: Initialize hypervisor on boot Michael Kelley 2020-08-24 16:46 ` Michael Kelley 2020-08-24 18:33 ` Arnd Bergmann 2020-08-24 18:33 ` Arnd Bergmann 2020-08-25 21:20 ` Michael Kelley 2020-08-25 21:20 ` Michael Kelley 2020-08-26 7:18 ` Arnd Bergmann 2020-08-26 7:18 ` Arnd Bergmann 2020-08-24 16:46 ` [PATCH v7 08/10] Drivers: hv: vmbus: Add hooks for per-CPU IRQ Michael Kelley 2020-08-24 16:46 ` Michael Kelley 2020-08-24 16:46 ` [PATCH v7 09/10] arm64: efi: Export screen_info Michael Kelley 2020-08-24 16:46 ` Michael Kelley 2020-08-24 17:21 ` Ard Biesheuvel 2020-08-24 17:21 ` Ard Biesheuvel 2020-08-24 17:35 ` Greg KH 2020-08-24 17:35 ` Greg KH 2020-08-24 17:40 ` Michael Kelley 2020-08-24 17:40 ` Michael Kelley 2020-08-24 17:52 ` Greg KH 2020-08-24 17:52 ` Greg KH 2020-08-24 16:46 ` [PATCH v7 10/10] Drivers: hv: Enable Hyper-V code to be built on ARM64 Michael Kelley 2020-08-24 16:46 ` Michael Kelley 2020-08-24 17:24 ` Ard Biesheuvel 2020-08-24 17:24 ` Ard Biesheuvel 2020-08-24 17:28 ` Michael Kelley 2020-08-24 17:28 ` Michael Kelley 2020-08-25 8:47 ` Ben Dooks 2020-08-25 8:47 ` Ben Dooks
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