From: Christoffer Dall christoffer.dall@arm.com
mainline inclusion from mainline-v5.8-rc5 commit 55009c6ed2d24fc0f5521ab2482f145d269389ea category: feature bugzilla: NA DTS: NA CVE: NA
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We currently intertwine the KVM PSCI implementation with the general dispatch of hypercall handling, which makes perfect sense because PSCI is the only category of hypercalls we support.
However, as we are about to support additional hypercalls, factor out this functionality into a separate hypercall handler file.
Signed-off-by: Christoffer Dall christoffer.dall@arm.com [steven.price@arm.com: rebased] Reviewed-by: Andrew Jones drjones@redhat.com Signed-off-by: Steven Price steven.price@arm.com Signed-off-by: Marc Zyngier maz@kernel.org --- arch/arm/kvm/Makefile | 2 +- arch/arm/kvm/handle_exit.c | 2 +- arch/arm64/kvm/Makefile | 1 + arch/arm64/kvm/handle_exit.c | 4 +- include/kvm/arm_hypercalls.h | 43 ++++++++++++++++++++ include/kvm/arm_psci.h | 2 +- virt/kvm/arm/hypercalls.c | 51 ++++++++++++++++++++++++ virt/kvm/arm/psci.c | 76 +----------------------------------- 8 files changed, 102 insertions(+), 79 deletions(-) create mode 100644 include/kvm/arm_hypercalls.h create mode 100644 virt/kvm/arm/hypercalls.c
diff --git a/arch/arm/kvm/Makefile b/arch/arm/kvm/Makefile index 48de846f2..5994f3b3d 100644 --- a/arch/arm/kvm/Makefile +++ b/arch/arm/kvm/Makefile @@ -24,7 +24,7 @@ obj-y += kvm-arm.o init.o interrupts.o obj-y += handle_exit.o guest.o emulate.o reset.o obj-y += coproc.o coproc_a15.o coproc_a7.o vgic-v3-coproc.o obj-y += $(KVM)/arm/arm.o $(KVM)/arm/mmu.o $(KVM)/arm/mmio.o -obj-y += $(KVM)/arm/psci.o $(KVM)/arm/perf.o +obj-y += $(KVM)/arm/psci.o $(KVM)/arm/perf.o $(KVM)/arm/hypercalls.o obj-y += $(KVM)/arm/aarch32.o
obj-y += $(KVM)/arm/vgic/vgic.o diff --git a/arch/arm/kvm/handle_exit.c b/arch/arm/kvm/handle_exit.c index 910bd8dab..404c67a06 100644 --- a/arch/arm/kvm/handle_exit.c +++ b/arch/arm/kvm/handle_exit.c @@ -21,7 +21,7 @@ #include <asm/kvm_emulate.h> #include <asm/kvm_coproc.h> #include <asm/kvm_mmu.h> -#include <kvm/arm_psci.h> +#include <kvm/arm_hypercalls.h> #include <trace/events/kvm.h>
#include "trace.h" diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile index fd930cdeb..d17040add 100644 --- a/arch/arm64/kvm/Makefile +++ b/arch/arm64/kvm/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_KVM_ARM_HOST) += hyp/ kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o $(KVM)/vfio.o kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/arm.o $(KVM)/arm/mmu.o $(KVM)/arm/mmio.o kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/psci.o $(KVM)/arm/perf.o +kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hypercalls.o
kvm-$(CONFIG_KVM_ARM_HOST) += inject_fault.o regmap.o va_layout.o kvm-$(CONFIG_KVM_ARM_HOST) += hyp.o hyp-init.o handle_exit.o diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c index 2349c2662..e893528cd 100644 --- a/arch/arm64/kvm/handle_exit.c +++ b/arch/arm64/kvm/handle_exit.c @@ -22,8 +22,6 @@ #include <linux/kvm.h> #include <linux/kvm_host.h>
-#include <kvm/arm_psci.h> - #include <asm/esr.h> #include <asm/exception.h> #include <asm/kvm_asm.h> @@ -33,6 +31,8 @@ #include <asm/debug-monitors.h> #include <asm/traps.h>
+#include <kvm/arm_hypercalls.h> + #define CREATE_TRACE_POINTS #include "trace.h"
diff --git a/include/kvm/arm_hypercalls.h b/include/kvm/arm_hypercalls.h new file mode 100644 index 000000000..0e2509d27 --- /dev/null +++ b/include/kvm/arm_hypercalls.h @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) 2019 Arm Ltd. */ + +#ifndef __KVM_ARM_HYPERCALLS_H +#define __KVM_ARM_HYPERCALLS_H + +#include <asm/kvm_emulate.h> + +int kvm_hvc_call_handler(struct kvm_vcpu *vcpu); + +static inline u32 smccc_get_function(struct kvm_vcpu *vcpu) +{ + return vcpu_get_reg(vcpu, 0); +} + +static inline unsigned long smccc_get_arg1(struct kvm_vcpu *vcpu) +{ + return vcpu_get_reg(vcpu, 1); +} + +static inline unsigned long smccc_get_arg2(struct kvm_vcpu *vcpu) +{ + return vcpu_get_reg(vcpu, 2); +} + +static inline unsigned long smccc_get_arg3(struct kvm_vcpu *vcpu) +{ + return vcpu_get_reg(vcpu, 3); +} + +static inline void smccc_set_retval(struct kvm_vcpu *vcpu, + unsigned long a0, + unsigned long a1, + unsigned long a2, + unsigned long a3) +{ + vcpu_set_reg(vcpu, 0, a0); + vcpu_set_reg(vcpu, 1, a1); + vcpu_set_reg(vcpu, 2, a2); + vcpu_set_reg(vcpu, 3, a3); +} + +#endif diff --git a/include/kvm/arm_psci.h b/include/kvm/arm_psci.h index 4b1548129..ac8cd19d2 100644 --- a/include/kvm/arm_psci.h +++ b/include/kvm/arm_psci.h @@ -51,7 +51,7 @@ static inline int kvm_psci_version(struct kvm_vcpu *vcpu, struct kvm *kvm) }
-int kvm_hvc_call_handler(struct kvm_vcpu *vcpu); +int kvm_psci_call(struct kvm_vcpu *vcpu);
struct kvm_one_reg;
diff --git a/virt/kvm/arm/hypercalls.c b/virt/kvm/arm/hypercalls.c new file mode 100644 index 000000000..738df465b --- /dev/null +++ b/virt/kvm/arm/hypercalls.c @@ -0,0 +1,51 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2019 Arm Ltd. + +#include <linux/arm-smccc.h> +#include <linux/kvm_host.h> + +#include <asm/kvm_emulate.h> + +#include <kvm/arm_hypercalls.h> +#include <kvm/arm_psci.h> + +int kvm_hvc_call_handler(struct kvm_vcpu *vcpu) +{ + u32 func_id = smccc_get_function(vcpu); + u32 val = SMCCC_RET_NOT_SUPPORTED; + u32 feature; + + switch (func_id) { + case ARM_SMCCC_VERSION_FUNC_ID: + val = ARM_SMCCC_VERSION_1_1; + break; + case ARM_SMCCC_ARCH_FEATURES_FUNC_ID: + feature = smccc_get_arg1(vcpu); + switch(feature) { + case ARM_SMCCC_ARCH_WORKAROUND_1: + if (kvm_arm_harden_branch_predictor()) + val = SMCCC_RET_SUCCESS; + break; + case ARM_SMCCC_ARCH_WORKAROUND_2: + switch (kvm_arm_have_ssbd()) { + case KVM_SSBD_FORCE_DISABLE: + case KVM_SSBD_UNKNOWN: + break; + case KVM_SSBD_KERNEL: + val = SMCCC_RET_SUCCESS; + break; + case KVM_SSBD_FORCE_ENABLE: + case KVM_SSBD_MITIGATED: + val = SMCCC_RET_NOT_REQUIRED; + break; + } + break; + } + break; + default: + return kvm_psci_call(vcpu); + } + + smccc_set_retval(vcpu, val, 0, 0, 0); + return 1; +} diff --git a/virt/kvm/arm/psci.c b/virt/kvm/arm/psci.c index 34d08ee63..155197d8f 100644 --- a/virt/kvm/arm/psci.c +++ b/virt/kvm/arm/psci.c @@ -26,6 +26,7 @@ #include <asm/kvm_host.h>
#include <kvm/arm_psci.h> +#include <kvm/arm_hypercalls.h>
/* * This is an implementation of the Power State Coordination Interface @@ -34,38 +35,6 @@
#define AFFINITY_MASK(level) ~((0x1UL << ((level) * MPIDR_LEVEL_BITS)) - 1)
-static u32 smccc_get_function(struct kvm_vcpu *vcpu) -{ - return vcpu_get_reg(vcpu, 0); -} - -static unsigned long smccc_get_arg1(struct kvm_vcpu *vcpu) -{ - return vcpu_get_reg(vcpu, 1); -} - -static unsigned long smccc_get_arg2(struct kvm_vcpu *vcpu) -{ - return vcpu_get_reg(vcpu, 2); -} - -static unsigned long smccc_get_arg3(struct kvm_vcpu *vcpu) -{ - return vcpu_get_reg(vcpu, 3); -} - -static void smccc_set_retval(struct kvm_vcpu *vcpu, - unsigned long a0, - unsigned long a1, - unsigned long a2, - unsigned long a3) -{ - vcpu_set_reg(vcpu, 0, a0); - vcpu_set_reg(vcpu, 1, a1); - vcpu_set_reg(vcpu, 2, a2); - vcpu_set_reg(vcpu, 3, a3); -} - static unsigned long psci_affinity_mask(unsigned long affinity_level) { if (affinity_level <= 3) @@ -384,7 +353,7 @@ static int kvm_psci_0_1_call(struct kvm_vcpu *vcpu) * Errors: * -EINVAL: Unrecognized PSCI function */ -static int kvm_psci_call(struct kvm_vcpu *vcpu) +int kvm_psci_call(struct kvm_vcpu *vcpu) { switch (kvm_psci_version(vcpu, vcpu->kvm)) { case KVM_ARM_PSCI_1_0: @@ -398,47 +367,6 @@ static int kvm_psci_call(struct kvm_vcpu *vcpu) }; }
-int kvm_hvc_call_handler(struct kvm_vcpu *vcpu) -{ - u32 func_id = smccc_get_function(vcpu); - u32 val = SMCCC_RET_NOT_SUPPORTED; - u32 feature; - - switch (func_id) { - case ARM_SMCCC_VERSION_FUNC_ID: - val = ARM_SMCCC_VERSION_1_1; - break; - case ARM_SMCCC_ARCH_FEATURES_FUNC_ID: - feature = smccc_get_arg1(vcpu); - switch(feature) { - case ARM_SMCCC_ARCH_WORKAROUND_1: - if (kvm_arm_harden_branch_predictor()) - val = SMCCC_RET_SUCCESS; - break; - case ARM_SMCCC_ARCH_WORKAROUND_2: - switch (kvm_arm_have_ssbd()) { - case KVM_SSBD_FORCE_DISABLE: - case KVM_SSBD_UNKNOWN: - break; - case KVM_SSBD_KERNEL: - val = SMCCC_RET_SUCCESS; - break; - case KVM_SSBD_FORCE_ENABLE: - case KVM_SSBD_MITIGATED: - val = SMCCC_RET_NOT_REQUIRED; - break; - } - break; - } - break; - default: - return kvm_psci_call(vcpu); - } - - smccc_set_retval(vcpu, val, 0, 0, 0); - return 1; -} - int kvm_arm_get_fw_num_regs(struct kvm_vcpu *vcpu) { return 1; /* PSCI version */