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linux/arch/arm64/include/asm/kvm_hyp.h

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 Based on 1 normalized pattern(s): 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 see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 503 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Enrico Weigelt <info@metux.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-03 05:44:50 +00:00
/* SPDX-License-Identifier: GPL-2.0-only */
arm64: KVM: Add a HYP-specific header file In order to expose the various EL2 services that are private to the hypervisor, add a new hyp.h file. So far, it only contains mundane things such as section annotation and VA manipulation. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2015-10-21 09:09:49 +00:00
/*
* Copyright (C) 2015 - ARM Ltd
* Author: Marc Zyngier <marc.zyngier@arm.com>
*/
#ifndef __ARM64_KVM_HYP_H__
#define __ARM64_KVM_HYP_H__
#include <linux/compiler.h>
#include <linux/kvm_host.h>
arm64: KVM: Add synchronization on translation regime change for erratum 1165522 In order to ensure that slipping HCR_EL2.TGE is done at the right time when switching translation regime, let insert the required ISBs that will be patched in when erratum 1165522 is detected. Take this opportunity to add the missing include of asm/alternative.h which was getting there by pure luck. Acked-by: Christoffer Dall <christoffer.dall@arm.com> Reviewed-by: James Morse <james.morse@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2018-12-06 17:31:24 +00:00
#include <asm/alternative.h>
arm64: KVM: Add a HYP-specific header file In order to expose the various EL2 services that are private to the hypervisor, add a new hyp.h file. So far, it only contains mundane things such as section annotation and VA manipulation. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2015-10-21 09:09:49 +00:00
#include <asm/sysreg.h>
KVM: arm64: Introduce hyp context During __guest_enter, save and restore from a new hyp context rather than the host context. This is preparation for separation of the hyp and host context in nVHE. Signed-off-by: Andrew Scull <ascull@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200915104643.2543892-9-ascull@google.com
2020-09-15 10:46:32 +00:00
DECLARE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt);
KVM: arm64: Save chosen hyp vector to a percpu variable Introduce a percpu variable to hold the address of the selected hyp vector that will be used with guests. This avoids the selection process each time a guest is being entered and can be used by nVHE when a separate vector is introduced for the host. Signed-off-by: Andrew Scull <ascull@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200915104643.2543892-6-ascull@google.com
2020-09-15 10:46:29 +00:00
DECLARE_PER_CPU(unsigned long, kvm_hyp_vector);
arm64: KVM: VHE: Introduce unified system register accessors VHE brings its own bag of new system registers, or rather system register accessors, as it define new ways to access both guest and host system registers. For example, from the host: - The host TCR_EL2 register is accessed using the TCR_EL1 accessor - The guest TCR_EL1 register is accessed using the TCR_EL12 accessor Obviously, this is confusing. A way to somehow reduce the complexity of writing code for both ARMv8 and ARMv8.1 is to use a set of unified accessors that will generate the right sysreg, depending on the mode the CPU is running in. For example: - read_sysreg_el1(tcr) will use TCR_EL1 on ARMv8, and TCR_EL12 on ARMv8.1 with VHE. - read_sysreg_el2(tcr) will use TCR_EL2 on ARMv8, and TCR_EL1 on ARMv8.1 with VHE. We end up with three sets of accessors ({read,write}_sysreg_el[012]) that can be directly used from C code. We take this opportunity to also add the definition for the new VHE sysregs. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2015-10-28 12:00:00 +00:00
#define read_sysreg_elx(r,nvh,vh) \
({ \
u64 reg; \
KVM: arm64: Migrate _elx sysreg accessors to msr_s/mrs_s Currently, the {read,write}_sysreg_el*() accessors for accessing particular ELs' sysregs in the presence of VHE rely on some local hacks and define their system register encodings in a way that is inconsistent with the core definitions in <asm/sysreg.h>. As a result, it is necessary to add duplicate definitions for any system register that already needs a definition in sysreg.h for other reasons. This is a bit of a maintenance headache, and the reasons for the _el*() accessors working the way they do is a bit historical. This patch gets rid of the shadow sysreg definitions in <asm/kvm_hyp.h>, converts the _el*() accessors to use the core __msr_s/__mrs_s interface, and converts all call sites to use the standard sysreg #define names (i.e., upper case, with SYS_ prefix). This patch will conflict heavily anyway, so the opportunity to clean up some bad whitespace in the context of the changes is taken. The change exposes a few system registers that have no sysreg.h definition, due to msr_s/mrs_s being used in place of msr/mrs: additions are made in order to fill in the gaps. Signed-off-by: Dave Martin <Dave.Martin@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christoffer Dall <christoffer.dall@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will.deacon@arm.com> Link: https://www.spinics.net/lists/kvm-arm/msg31717.html [Rebased to v4.21-rc1] Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> [Rebased to v5.2-rc5, changelog updates] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2019-04-06 10:29:40 +00:00
asm volatile(ALTERNATIVE(__mrs_s("%0", r##nvh), \
arm64: sysreg: Make mrs_s and msr_s macros work with Clang and LTO Clang's integrated assembler does not allow assembly macros defined in one inline asm block using the .macro directive to be used across separate asm blocks. LLVM developers consider this a feature and not a bug, recommending code refactoring: https://bugs.llvm.org/show_bug.cgi?id=19749 As binutils doesn't allow macros to be redefined, this change uses UNDEFINE_MRS_S and UNDEFINE_MSR_S to define corresponding macros in-place and workaround gcc and clang limitations on redefining macros across different assembler blocks. Specifically, the current state after preprocessing looks like this: asm volatile(".macro mXX_s ... .endm"); void f() { asm volatile("mXX_s a, b"); } With GCC, it gives macro redefinition error because sysreg.h is included in multiple source files, and assembler code for all of them is later combined for LTO (I've seen an intermediate file with hundreds of identical definitions). With clang, it gives macro undefined error because clang doesn't allow sharing macros between inline asm statements. I also seem to remember catching another sort of undefined error with GCC due to reordering of macro definition asm statement and generated asm code for function that uses the macro. The solution with defining and undefining for each use, while certainly not elegant, satisfies both GCC and clang, LTO and non-LTO. Co-developed-by: Alex Matveev <alxmtvv@gmail.com> Co-developed-by: Yury Norov <ynorov@caviumnetworks.com> Co-developed-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
2019-04-24 16:55:37 +00:00
__mrs_s("%0", r##vh), \
arm64: KVM: VHE: Introduce unified system register accessors VHE brings its own bag of new system registers, or rather system register accessors, as it define new ways to access both guest and host system registers. For example, from the host: - The host TCR_EL2 register is accessed using the TCR_EL1 accessor - The guest TCR_EL1 register is accessed using the TCR_EL12 accessor Obviously, this is confusing. A way to somehow reduce the complexity of writing code for both ARMv8 and ARMv8.1 is to use a set of unified accessors that will generate the right sysreg, depending on the mode the CPU is running in. For example: - read_sysreg_el1(tcr) will use TCR_EL1 on ARMv8, and TCR_EL12 on ARMv8.1 with VHE. - read_sysreg_el2(tcr) will use TCR_EL2 on ARMv8, and TCR_EL1 on ARMv8.1 with VHE. We end up with three sets of accessors ({read,write}_sysreg_el[012]) that can be directly used from C code. We take this opportunity to also add the definition for the new VHE sysregs. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2015-10-28 12:00:00 +00:00
ARM64_HAS_VIRT_HOST_EXTN) \
: "=r" (reg)); \
reg; \
})
#define write_sysreg_elx(v,r,nvh,vh) \
do { \
u64 __val = (u64)(v); \
KVM: arm64: Migrate _elx sysreg accessors to msr_s/mrs_s Currently, the {read,write}_sysreg_el*() accessors for accessing particular ELs' sysregs in the presence of VHE rely on some local hacks and define their system register encodings in a way that is inconsistent with the core definitions in <asm/sysreg.h>. As a result, it is necessary to add duplicate definitions for any system register that already needs a definition in sysreg.h for other reasons. This is a bit of a maintenance headache, and the reasons for the _el*() accessors working the way they do is a bit historical. This patch gets rid of the shadow sysreg definitions in <asm/kvm_hyp.h>, converts the _el*() accessors to use the core __msr_s/__mrs_s interface, and converts all call sites to use the standard sysreg #define names (i.e., upper case, with SYS_ prefix). This patch will conflict heavily anyway, so the opportunity to clean up some bad whitespace in the context of the changes is taken. The change exposes a few system registers that have no sysreg.h definition, due to msr_s/mrs_s being used in place of msr/mrs: additions are made in order to fill in the gaps. Signed-off-by: Dave Martin <Dave.Martin@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christoffer Dall <christoffer.dall@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will.deacon@arm.com> Link: https://www.spinics.net/lists/kvm-arm/msg31717.html [Rebased to v4.21-rc1] Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> [Rebased to v5.2-rc5, changelog updates] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2019-04-06 10:29:40 +00:00
asm volatile(ALTERNATIVE(__msr_s(r##nvh, "%x0"), \
arm64: sysreg: Make mrs_s and msr_s macros work with Clang and LTO Clang's integrated assembler does not allow assembly macros defined in one inline asm block using the .macro directive to be used across separate asm blocks. LLVM developers consider this a feature and not a bug, recommending code refactoring: https://bugs.llvm.org/show_bug.cgi?id=19749 As binutils doesn't allow macros to be redefined, this change uses UNDEFINE_MRS_S and UNDEFINE_MSR_S to define corresponding macros in-place and workaround gcc and clang limitations on redefining macros across different assembler blocks. Specifically, the current state after preprocessing looks like this: asm volatile(".macro mXX_s ... .endm"); void f() { asm volatile("mXX_s a, b"); } With GCC, it gives macro redefinition error because sysreg.h is included in multiple source files, and assembler code for all of them is later combined for LTO (I've seen an intermediate file with hundreds of identical definitions). With clang, it gives macro undefined error because clang doesn't allow sharing macros between inline asm statements. I also seem to remember catching another sort of undefined error with GCC due to reordering of macro definition asm statement and generated asm code for function that uses the macro. The solution with defining and undefining for each use, while certainly not elegant, satisfies both GCC and clang, LTO and non-LTO. Co-developed-by: Alex Matveev <alxmtvv@gmail.com> Co-developed-by: Yury Norov <ynorov@caviumnetworks.com> Co-developed-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
2019-04-24 16:55:37 +00:00
__msr_s(r##vh, "%x0"), \
arm64: KVM: VHE: Introduce unified system register accessors VHE brings its own bag of new system registers, or rather system register accessors, as it define new ways to access both guest and host system registers. For example, from the host: - The host TCR_EL2 register is accessed using the TCR_EL1 accessor - The guest TCR_EL1 register is accessed using the TCR_EL12 accessor Obviously, this is confusing. A way to somehow reduce the complexity of writing code for both ARMv8 and ARMv8.1 is to use a set of unified accessors that will generate the right sysreg, depending on the mode the CPU is running in. For example: - read_sysreg_el1(tcr) will use TCR_EL1 on ARMv8, and TCR_EL12 on ARMv8.1 with VHE. - read_sysreg_el2(tcr) will use TCR_EL2 on ARMv8, and TCR_EL1 on ARMv8.1 with VHE. We end up with three sets of accessors ({read,write}_sysreg_el[012]) that can be directly used from C code. We take this opportunity to also add the definition for the new VHE sysregs. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2015-10-28 12:00:00 +00:00
ARM64_HAS_VIRT_HOST_EXTN) \
: : "rZ" (__val)); \
} while (0)
/*
* Unified accessors for registers that have a different encoding
* between VHE and non-VHE. They must be specified without their "ELx"
KVM: arm64: Migrate _elx sysreg accessors to msr_s/mrs_s Currently, the {read,write}_sysreg_el*() accessors for accessing particular ELs' sysregs in the presence of VHE rely on some local hacks and define their system register encodings in a way that is inconsistent with the core definitions in <asm/sysreg.h>. As a result, it is necessary to add duplicate definitions for any system register that already needs a definition in sysreg.h for other reasons. This is a bit of a maintenance headache, and the reasons for the _el*() accessors working the way they do is a bit historical. This patch gets rid of the shadow sysreg definitions in <asm/kvm_hyp.h>, converts the _el*() accessors to use the core __msr_s/__mrs_s interface, and converts all call sites to use the standard sysreg #define names (i.e., upper case, with SYS_ prefix). This patch will conflict heavily anyway, so the opportunity to clean up some bad whitespace in the context of the changes is taken. The change exposes a few system registers that have no sysreg.h definition, due to msr_s/mrs_s being used in place of msr/mrs: additions are made in order to fill in the gaps. Signed-off-by: Dave Martin <Dave.Martin@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christoffer Dall <christoffer.dall@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will.deacon@arm.com> Link: https://www.spinics.net/lists/kvm-arm/msg31717.html [Rebased to v4.21-rc1] Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> [Rebased to v5.2-rc5, changelog updates] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2019-04-06 10:29:40 +00:00
* encoding, but with the SYS_ prefix, as defined in asm/sysreg.h.
arm64: KVM: VHE: Introduce unified system register accessors VHE brings its own bag of new system registers, or rather system register accessors, as it define new ways to access both guest and host system registers. For example, from the host: - The host TCR_EL2 register is accessed using the TCR_EL1 accessor - The guest TCR_EL1 register is accessed using the TCR_EL12 accessor Obviously, this is confusing. A way to somehow reduce the complexity of writing code for both ARMv8 and ARMv8.1 is to use a set of unified accessors that will generate the right sysreg, depending on the mode the CPU is running in. For example: - read_sysreg_el1(tcr) will use TCR_EL1 on ARMv8, and TCR_EL12 on ARMv8.1 with VHE. - read_sysreg_el2(tcr) will use TCR_EL2 on ARMv8, and TCR_EL1 on ARMv8.1 with VHE. We end up with three sets of accessors ({read,write}_sysreg_el[012]) that can be directly used from C code. We take this opportunity to also add the definition for the new VHE sysregs. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2015-10-28 12:00:00 +00:00
*/
#define read_sysreg_el0(r) read_sysreg_elx(r, _EL0, _EL02)
#define write_sysreg_el0(v,r) write_sysreg_elx(v, r, _EL0, _EL02)
#define read_sysreg_el1(r) read_sysreg_elx(r, _EL1, _EL12)
#define write_sysreg_el1(v,r) write_sysreg_elx(v, r, _EL1, _EL12)
KVM: arm64: Migrate _elx sysreg accessors to msr_s/mrs_s Currently, the {read,write}_sysreg_el*() accessors for accessing particular ELs' sysregs in the presence of VHE rely on some local hacks and define their system register encodings in a way that is inconsistent with the core definitions in <asm/sysreg.h>. As a result, it is necessary to add duplicate definitions for any system register that already needs a definition in sysreg.h for other reasons. This is a bit of a maintenance headache, and the reasons for the _el*() accessors working the way they do is a bit historical. This patch gets rid of the shadow sysreg definitions in <asm/kvm_hyp.h>, converts the _el*() accessors to use the core __msr_s/__mrs_s interface, and converts all call sites to use the standard sysreg #define names (i.e., upper case, with SYS_ prefix). This patch will conflict heavily anyway, so the opportunity to clean up some bad whitespace in the context of the changes is taken. The change exposes a few system registers that have no sysreg.h definition, due to msr_s/mrs_s being used in place of msr/mrs: additions are made in order to fill in the gaps. Signed-off-by: Dave Martin <Dave.Martin@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christoffer Dall <christoffer.dall@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will.deacon@arm.com> Link: https://www.spinics.net/lists/kvm-arm/msg31717.html [Rebased to v4.21-rc1] Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> [Rebased to v5.2-rc5, changelog updates] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2019-04-06 10:29:40 +00:00
#define read_sysreg_el2(r) read_sysreg_elx(r, _EL2, _EL1)
#define write_sysreg_el2(v,r) write_sysreg_elx(v, r, _EL2, _EL1)
arm64: KVM: VHE: Introduce unified system register accessors VHE brings its own bag of new system registers, or rather system register accessors, as it define new ways to access both guest and host system registers. For example, from the host: - The host TCR_EL2 register is accessed using the TCR_EL1 accessor - The guest TCR_EL1 register is accessed using the TCR_EL12 accessor Obviously, this is confusing. A way to somehow reduce the complexity of writing code for both ARMv8 and ARMv8.1 is to use a set of unified accessors that will generate the right sysreg, depending on the mode the CPU is running in. For example: - read_sysreg_el1(tcr) will use TCR_EL1 on ARMv8, and TCR_EL12 on ARMv8.1 with VHE. - read_sysreg_el2(tcr) will use TCR_EL2 on ARMv8, and TCR_EL1 on ARMv8.1 with VHE. We end up with three sets of accessors ({read,write}_sysreg_el[012]) that can be directly used from C code. We take this opportunity to also add the definition for the new VHE sysregs. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2015-10-28 12:00:00 +00:00
KVM: arm64: Define our own swab32() to avoid a uapi static inline KVM uses swab32() when mediating GIC MMIO accesses if the GICV is badly aligned, and the host and guest differ in endianness. arm64 doesn't provide a __arch_swab32(), so __fswab32() is always backed by the macro implementation that the compiler reduces to a single instruction. But the static-inline causes problems for KVM if the compiler chooses not to inline this function, it may not be located in the __hyp_text where __vgic_v2_perform_cpuif_access() needs it. Create our own __kvm_swab32() macro that calls ___constant_swab32() directly. This way we know it will always be inlined. Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200220165839.256881-3-james.morse@arm.com
2020-02-20 16:58:38 +00:00
/*
* Without an __arch_swab32(), we fall back to ___constant_swab32(), but the
* static inline can allow the compiler to out-of-line this. KVM always wants
* the macro version as its always inlined.
*/
#define __kvm_swab32(x) ___constant_swab32(x)
arm64: KVM: Inject a vSerror if detecting a bad GICV access at EL2 If, when proxying a GICV access at EL2, we detect that the guest is doing something silly, report an EL1 SError instead ofgnoring the access. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
2016-09-06 13:02:17 +00:00
int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu);
arm64: KVM: Implement vgic-v2 save/restore Implement the vgic-v2 save restore (mostly) as a direct translation of the assembly code version. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2015-10-19 14:50:37 +00:00
KVM: arm64: vgic-v3: Take cpu_if pointer directly instead of vcpu If we move the used_lrs field to the version-specific cpu interface structure, the following functions only operate on the struct vgic_v3_cpu_if and not the full vcpu: __vgic_v3_save_state __vgic_v3_restore_state __vgic_v3_activate_traps __vgic_v3_deactivate_traps __vgic_v3_save_aprs __vgic_v3_restore_aprs This is going to be very useful for nested virt, so move the used_lrs field and change the prototypes and implementations of these functions to take the cpu_if parameter directly. No functional change. Reviewed-by: James Morse <james.morse@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org>
2018-12-01 16:41:28 +00:00
void __vgic_v3_save_state(struct vgic_v3_cpu_if *cpu_if);
void __vgic_v3_restore_state(struct vgic_v3_cpu_if *cpu_if);
void __vgic_v3_activate_traps(struct vgic_v3_cpu_if *cpu_if);
void __vgic_v3_deactivate_traps(struct vgic_v3_cpu_if *cpu_if);
void __vgic_v3_save_aprs(struct vgic_v3_cpu_if *cpu_if);
void __vgic_v3_restore_aprs(struct vgic_v3_cpu_if *cpu_if);
KVM: arm64: vgic-v3: Add hook to handle guest GICv3 sysreg accesses at EL2 In order to start handling guest access to GICv3 system registers, let's add a hook that will get called when we trap a system register access. This is gated by a new static key (vgic_v3_cpuif_trap). Tested-by: Alexander Graf <agraf@suse.de> Acked-by: David Daney <david.daney@cavium.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Christoffer Dall <cdall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <cdall@linaro.org>
2017-06-09 11:49:33 +00:00
int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu);
arm64: KVM: Implement vgic-v3 save/restore Implement the vgic-v3 save restore as a direct translation of the assembly code version. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2015-10-19 14:50:58 +00:00
KVM: arm64: Duplicate hyp/timer-sr.c for VHE/nVHE timer-sr.c contains a HVC handler for setting CNTVOFF_EL2 and two helper functions for controlling access to physical counter. The former is used by both VHE/nVHE and is duplicated, the latter are used only by nVHE and moved to nvhe/timer-sr.c. Signed-off-by: David Brazdil <dbrazdil@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200625131420.71444-13-dbrazdil@google.com
2020-06-25 13:14:17 +00:00
#ifdef __KVM_NVHE_HYPERVISOR__
KVM: arm/arm64: Move timer save/restore out of the hyp code As we are about to be lazy with saving and restoring the timer registers, we prepare by moving all possible timer configuration logic out of the hyp code. All virtual timer registers can be programmed from EL1 and since the arch timer is always a level triggered interrupt we can safely do this with interrupts disabled in the host kernel on the way to the guest without taking vtimer interrupts in the host kernel (yet). The downside is that the cntvoff register can only be programmed from hyp mode, so we jump into hyp mode and back to program it. This is also safe, because the host kernel doesn't use the virtual timer in the KVM code. It may add a little performance performance penalty, but only until following commits where we move this operation to vcpu load/put. Signed-off-by: Christoffer Dall <cdall@linaro.org> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
2017-01-04 15:10:28 +00:00
void __timer_enable_traps(struct kvm_vcpu *vcpu);
void __timer_disable_traps(struct kvm_vcpu *vcpu);
KVM: arm64: Duplicate hyp/timer-sr.c for VHE/nVHE timer-sr.c contains a HVC handler for setting CNTVOFF_EL2 and two helper functions for controlling access to physical counter. The former is used by both VHE/nVHE and is duplicated, the latter are used only by nVHE and moved to nvhe/timer-sr.c. Signed-off-by: David Brazdil <dbrazdil@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200625131420.71444-13-dbrazdil@google.com
2020-06-25 13:14:17 +00:00
#endif
arm64: KVM: Implement timer save/restore Implement the timer save restore as a direct translation of the assembly code version. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2015-10-19 15:32:20 +00:00
KVM: arm64: Split hyp/sysreg-sr.c to VHE/nVHE sysreg-sr.c contains KVM's code for saving/restoring system registers, with some code shared between VHE/nVHE. These common routines are moved to a header file, VHE-specific code is moved to vhe/sysreg-sr.c and nVHE-specific code to nvhe/sysreg-sr.c. Signed-off-by: David Brazdil <dbrazdil@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200625131420.71444-12-dbrazdil@google.com
2020-06-25 13:14:16 +00:00
#ifdef __KVM_NVHE_HYPERVISOR__
KVM: arm64: Unify non-VHE host/guest sysreg save and restore functions There is no need to have multiple identical functions with different names for saving host and guest state. When saving and restoring state for the host and guest, the state is the same for both contexts, and that's why we have the kvm_cpu_context structure. Delete one version and rename the other into simply save/restore. Reviewed-by: Andrew Jones <drjones@redhat.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-10-10 20:40:13 +00:00
void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt);
void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt);
KVM: arm64: Split hyp/sysreg-sr.c to VHE/nVHE sysreg-sr.c contains KVM's code for saving/restoring system registers, with some code shared between VHE/nVHE. These common routines are moved to a header file, VHE-specific code is moved to vhe/sysreg-sr.c and nVHE-specific code to nvhe/sysreg-sr.c. Signed-off-by: David Brazdil <dbrazdil@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200625131420.71444-12-dbrazdil@google.com
2020-06-25 13:14:16 +00:00
#else
KVM: arm64: Introduce separate VHE/non-VHE sysreg save/restore functions As we are about to handle system registers quite differently between VHE and non-VHE systems. In preparation for that, we need to split some of the handling functions between VHE and non-VHE functionality. For now, we simply copy the non-VHE functions, but we do change the use of static keys for VHE and non-VHE functionality now that we have separate functions. Reviewed-by: Andrew Jones <drjones@redhat.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-10-10 20:19:31 +00:00
void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt);
void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt);
void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt);
void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt);
KVM: arm64: Split hyp/sysreg-sr.c to VHE/nVHE sysreg-sr.c contains KVM's code for saving/restoring system registers, with some code shared between VHE/nVHE. These common routines are moved to a header file, VHE-specific code is moved to vhe/sysreg-sr.c and nVHE-specific code to nvhe/sysreg-sr.c. Signed-off-by: David Brazdil <dbrazdil@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200625131420.71444-12-dbrazdil@google.com
2020-06-25 13:14:16 +00:00
#endif
arm64: KVM: Implement system register save/restore Implement the system register save/restore as a direct translation of the assembly code version. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
2015-10-19 17:02:48 +00:00
KVM: arm64: Improve debug register save/restore flow Instead of having multiple calls from the world switch path to the debug logic, each figuring out if the dirty bit is set and if we should save/restore the debug registers, let's just provide two hooks to the debug save/restore functionality, one for switching to the guest context, and one for switching to the host context, and we get the benefit of only having to evaluate the dirty flag once on each path, plus we give the compiler some more room to inline some of this functionality. Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Andrew Jones <drjones@redhat.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-10-10 18:10:08 +00:00
void __debug_switch_to_guest(struct kvm_vcpu *vcpu);
void __debug_switch_to_host(struct kvm_vcpu *vcpu);
arm64: KVM: Implement debug save/restore Implement the debug save restore as a direct translation of the assembly code version. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Tested-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
2015-10-19 20:02:46 +00:00
arm64: KVM: Implement fpsimd save/restore Implement the fpsimd save restore, keeping the lazy part in assembler (as returning to C would be overkill). Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
2015-10-26 08:34:09 +00:00
void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
KVM: arm64: Split hyp/switch.c to VHE/nVHE switch.c implements context-switching for KVM, with large parts shared between VHE/nVHE. These common routines are moved to a header file, VHE-specific code is moved to vhe/switch.c and nVHE-specific code is moved to nvhe/switch.c. Previously __kvm_vcpu_run needed a different symbol name for VHE/nVHE. This is cleaned up and the caller in arm.c simplified. Signed-off-by: David Brazdil <dbrazdil@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200625131420.71444-10-dbrazdil@google.com
2020-06-25 13:14:14 +00:00
#ifndef __KVM_NVHE_HYPERVISOR__
KVM: arm64: Configure c15, PMU, and debug register traps on cpu load/put for VHE We do not have to change the c15 trap setting on each switch to/from the guest on VHE systems, because this setting only affects guest EL1/EL0 (and therefore not the VHE host). The PMU and debug trap configuration can also be done on vcpu load/put instead, because they don't affect how the VHE host kernel can access the debug registers while executing KVM kernel code. Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Andrew Jones <drjones@redhat.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-08-04 11:47:18 +00:00
void activate_traps_vhe_load(struct kvm_vcpu *vcpu);
void deactivate_traps_vhe_put(void);
KVM: arm64: Split hyp/switch.c to VHE/nVHE switch.c implements context-switching for KVM, with large parts shared between VHE/nVHE. These common routines are moved to a header file, VHE-specific code is moved to vhe/switch.c and nVHE-specific code is moved to nvhe/switch.c. Previously __kvm_vcpu_run needed a different symbol name for VHE/nVHE. This is cleaned up and the caller in arm.c simplified. Signed-off-by: David Brazdil <dbrazdil@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200625131420.71444-10-dbrazdil@google.com
2020-06-25 13:14:14 +00:00
#endif
KVM: arm64: Configure c15, PMU, and debug register traps on cpu load/put for VHE We do not have to change the c15 trap setting on each switch to/from the guest on VHE systems, because this setting only affects guest EL1/EL0 (and therefore not the VHE host). The PMU and debug trap configuration can also be done on vcpu load/put instead, because they don't affect how the VHE host kernel can access the debug registers while executing KVM kernel code. Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Andrew Jones <drjones@redhat.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-08-04 11:47:18 +00:00
KVM: arm64: Introduce hyp context During __guest_enter, save and restore from a new hyp context rather than the host context. This is preparation for separation of the hyp and host context in nVHE. Signed-off-by: Andrew Scull <ascull@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200915104643.2543892-9-ascull@google.com
2020-09-15 10:46:32 +00:00
u64 __guest_enter(struct kvm_vcpu *vcpu);
KVM: arm64: Split hyp/switch.c to VHE/nVHE switch.c implements context-switching for KVM, with large parts shared between VHE/nVHE. These common routines are moved to a header file, VHE-specific code is moved to vhe/switch.c and nVHE-specific code is moved to nvhe/switch.c. Previously __kvm_vcpu_run needed a different symbol name for VHE/nVHE. This is cleaned up and the caller in arm.c simplified. Signed-off-by: David Brazdil <dbrazdil@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200625131420.71444-10-dbrazdil@google.com
2020-06-25 13:14:14 +00:00
KVM: arm64: Remove hyp_panic arguments hyp_panic is able to find all the context it needs from within itself so remove the argument. The __hyp_panic wrapper becomes redundant so is also removed. Signed-off-by: Andrew Scull <ascull@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200915104643.2543892-3-ascull@google.com
2020-09-15 10:46:26 +00:00
void __noreturn hyp_panic(void);
KVM: arm64: Split hyp/switch.c to VHE/nVHE switch.c implements context-switching for KVM, with large parts shared between VHE/nVHE. These common routines are moved to a header file, VHE-specific code is moved to vhe/switch.c and nVHE-specific code is moved to nvhe/switch.c. Previously __kvm_vcpu_run needed a different symbol name for VHE/nVHE. This is cleaned up and the caller in arm.c simplified. Signed-off-by: David Brazdil <dbrazdil@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200625131420.71444-10-dbrazdil@google.com
2020-06-25 13:14:14 +00:00
#ifdef __KVM_NVHE_HYPERVISOR__
KVM: arm64: nVHE: Handle hyp panics Restore the host context when panicking from hyp to give the best chance of the panic being clean. The host requires that registers be preserved such as x18 for the shadow callstack. If the panic is caused by an exception from EL1, the host context is still valid so the panic can return straight back to the host. If the panic comes from EL2 then it's most likely that the hyp context is active and the host context needs to be restored. There are windows before and after the host context is saved and restored that restoration is attempted incorrectly and the panic won't be clean. Signed-off-by: Andrew Scull <ascull@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200915104643.2543892-14-ascull@google.com
2020-09-15 10:46:37 +00:00
void __noreturn __hyp_do_panic(bool restore_host, u64 spsr, u64 elr, u64 par);
KVM: arm64: Split hyp/switch.c to VHE/nVHE switch.c implements context-switching for KVM, with large parts shared between VHE/nVHE. These common routines are moved to a header file, VHE-specific code is moved to vhe/switch.c and nVHE-specific code is moved to nvhe/switch.c. Previously __kvm_vcpu_run needed a different symbol name for VHE/nVHE. This is cleaned up and the caller in arm.c simplified. Signed-off-by: David Brazdil <dbrazdil@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200625131420.71444-10-dbrazdil@google.com
2020-06-25 13:14:14 +00:00
#endif
arm64: KVM: Implement guest entry Contrary to the previous patch, the guest entry is fairly different from its assembly counterpart, mostly because it is only concerned with saving/restoring the GP registers, and nothing else. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2015-10-22 07:32:18 +00:00
arm64: KVM: Add a HYP-specific header file In order to expose the various EL2 services that are private to the hypervisor, add a new hyp.h file. So far, it only contains mundane things such as section annotation and VA manipulation. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2015-10-21 09:09:49 +00:00
#endif /* __ARM64_KVM_HYP_H__ */
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