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Merge remote-tracking branch 'kvmarm/kvm-arm64/stolen-time' into kvmarm-master/next

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This commit is contained in:
Marc Zyngier 2019-10-24 15:04:09 +01:00
commit a4b28f5c67
36 changed files with 775 additions and 208 deletions
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6
Documentation/admin-guide/kernel-parameters.txt
View File

@ -3083,9 +3083,9 @@
[X86,PV_OPS] Disable paravirtualized VMware scheduler
clock and use the default one.
no-steal-acc [X86,KVM] Disable paravirtualized steal time accounting.
steal time is computed, but won't influence scheduler
behaviour
no-steal-acc [X86,KVM,ARM64] Disable paravirtualized steal time
accounting. steal time is computed, but won't
influence scheduler behaviour
nolapic [X86-32,APIC] Do not enable or use the local APIC.

80
Documentation/virt/kvm/arm/pvtime.rst Normal file
View File

@ -0,0 +1,80 @@
.. SPDX-License-Identifier: GPL-2.0
Paravirtualized time support for arm64
======================================
Arm specification DEN0057/A defines a standard for paravirtualised time
support for AArch64 guests:
https://developer.arm.com/docs/den0057/a
KVM/arm64 implements the stolen time part of this specification by providing
some hypervisor service calls to support a paravirtualized guest obtaining a
view of the amount of time stolen from its execution.
Two new SMCCC compatible hypercalls are defined:
* PV_TIME_FEATURES: 0xC5000020
* PV_TIME_ST: 0xC5000021
These are only available in the SMC64/HVC64 calling convention as
paravirtualized time is not available to 32 bit Arm guests. The existence of
the PV_FEATURES hypercall should be probed using the SMCCC 1.1 ARCH_FEATURES
mechanism before calling it.
PV_TIME_FEATURES
============= ======== ==========
Function ID: (uint32) 0xC5000020
PV_call_id: (uint32) The function to query for support.
Currently only PV_TIME_ST is supported.
Return value: (int64) NOT_SUPPORTED (-1) or SUCCESS (0) if the relevant
PV-time feature is supported by the hypervisor.
============= ======== ==========
PV_TIME_ST
============= ======== ==========
Function ID: (uint32) 0xC5000021
Return value: (int64) IPA of the stolen time data structure for this
VCPU. On failure:
NOT_SUPPORTED (-1)
============= ======== ==========
The IPA returned by PV_TIME_ST should be mapped by the guest as normal memory
with inner and outer write back caching attributes, in the inner shareable
domain. A total of 16 bytes from the IPA returned are guaranteed to be
meaningfully filled by the hypervisor (see structure below).
PV_TIME_ST returns the structure for the calling VCPU.
Stolen Time
-----------
The structure pointed to by the PV_TIME_ST hypercall is as follows:
+-------------+-------------+-------------+----------------------------+
| Field | Byte Length | Byte Offset | Description |
+=============+=============+=============+============================+
| Revision | 4 | 0 | Must be 0 for version 1.0 |
+-------------+-------------+-------------+----------------------------+
| Attributes | 4 | 4 | Must be 0 |
+-------------+-------------+-------------+----------------------------+
| Stolen time | 8 | 8 | Stolen time in unsigned |
| | | | nanoseconds indicating how |
| | | | much time this VCPU thread |
| | | | was involuntarily not |
| | | | running on a physical CPU. |
+-------------+-------------+-------------+----------------------------+
All values in the structure are stored little-endian.
The structure will be updated by the hypervisor prior to scheduling a VCPU. It
will be present within a reserved region of the normal memory given to the
guest. The guest should not attempt to write into this memory. There is a
structure per VCPU of the guest.
It is advisable that one or more 64k pages are set aside for the purpose of
these structures and not used for other purposes, this enables the guest to map
the region using 64k pages and avoids conflicting attributes with other memory.
For the user space interface see Documentation/virt/kvm/devices/vcpu.txt
section "3. GROUP: KVM_ARM_VCPU_PVTIME_CTRL".

14
Documentation/virt/kvm/devices/vcpu.txt
View File

@ -60,3 +60,17 @@ time to use the number provided for a given timer, overwriting any previously
configured values on other VCPUs. Userspace should configure the interrupt
numbers on at least one VCPU after creating all VCPUs and before running any
VCPUs.
3. GROUP: KVM_ARM_VCPU_PVTIME_CTRL
Architectures: ARM64
3.1 ATTRIBUTE: KVM_ARM_VCPU_PVTIME_IPA
Parameters: 64-bit base address
Returns: -ENXIO: Stolen time not implemented
-EEXIST: Base address already set for this VCPU
-EINVAL: Base address not 64 byte aligned
Specifies the base address of the stolen time structure for this VCPU. The
base address must be 64 byte aligned and exist within a valid guest memory
region. See Documentation/virt/kvm/arm/pvtime.txt for more information
including the layout of the stolen time structure.

25
arch/arm/include/asm/kvm_host.h
View File

@ -7,6 +7,7 @@
#ifndef __ARM_KVM_HOST_H__
#define __ARM_KVM_HOST_H__
#include <linux/arm-smccc.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/kvm_types.h>
@ -38,6 +39,7 @@
KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_IRQ_PENDING KVM_ARCH_REQ(1)
#define KVM_REQ_VCPU_RESET KVM_ARCH_REQ(2)
#define KVM_REQ_RECORD_STEAL KVM_ARCH_REQ(3)
DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
@ -331,6 +333,29 @@ static inline int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext)
int kvm_perf_init(void);
int kvm_perf_teardown(void);
static inline long kvm_hypercall_pv_features(struct kvm_vcpu *vcpu)
{
return SMCCC_RET_NOT_SUPPORTED;
}
static inline gpa_t kvm_init_stolen_time(struct kvm_vcpu *vcpu)
{
return GPA_INVALID;
}
static inline void kvm_update_stolen_time(struct kvm_vcpu *vcpu)
{
}
static inline void kvm_arm_pvtime_vcpu_init(struct kvm_vcpu_arch *vcpu_arch)
{
}
static inline bool kvm_arm_is_pvtime_enabled(struct kvm_vcpu_arch *vcpu_arch)
{
return false;
}
void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);

2
arch/arm/kvm/Makefile
View File

@ -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

2
arch/arm/kvm/handle_exit.c
View File

@ -9,7 +9,7 @@
#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"

21
arch/arm/mm/proc-v7-bugs.c
View File

@ -1,7 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/arm-smccc.h>
#include <linux/kernel.h>
#include <linux/psci.h>
#include <linux/smp.h>
#include <asm/cp15.h>
@ -75,26 +74,20 @@ static void cpu_v7_spectre_init(void)
case ARM_CPU_PART_CORTEX_A72: {
struct arm_smccc_res res;
if (psci_ops.smccc_version == SMCCC_VERSION_1_0)
break;
arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_ARCH_WORKAROUND_1, &res);
if ((int)res.a0 != 0)
return;
switch (psci_ops.conduit) {
case PSCI_CONDUIT_HVC:
arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_ARCH_WORKAROUND_1, &res);
if ((int)res.a0 != 0)
break;
switch (arm_smccc_1_1_get_conduit()) {
case SMCCC_CONDUIT_HVC:
per_cpu(harden_branch_predictor_fn, cpu) =
call_hvc_arch_workaround_1;
cpu_do_switch_mm = cpu_v7_hvc_switch_mm;
spectre_v2_method = "hypervisor";
break;
case PSCI_CONDUIT_SMC:
arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_ARCH_WORKAROUND_1, &res);
if ((int)res.a0 != 0)
break;
case SMCCC_CONDUIT_SMC:
per_cpu(harden_branch_predictor_fn, cpu) =
call_smc_arch_workaround_1;
cpu_do_switch_mm = cpu_v7_smc_switch_mm;

29
arch/arm64/include/asm/kvm_host.h
View File

@ -44,6 +44,7 @@
KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_IRQ_PENDING KVM_ARCH_REQ(1)
#define KVM_REQ_VCPU_RESET KVM_ARCH_REQ(2)
#define KVM_REQ_RECORD_STEAL KVM_ARCH_REQ(3)
DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
@ -346,6 +347,13 @@ struct kvm_vcpu_arch {
/* True when deferrable sysregs are loaded on the physical CPU,
* see kvm_vcpu_load_sysregs and kvm_vcpu_put_sysregs. */
bool sysregs_loaded_on_cpu;
/* Guest PV state */
struct {
u64 steal;
u64 last_steal;
gpa_t base;
} steal;
};
/* Pointer to the vcpu's SVE FFR for sve_{save,load}_state() */
@ -486,6 +494,27 @@ void handle_exit_early(struct kvm_vcpu *vcpu, struct kvm_run *run,
int kvm_perf_init(void);
int kvm_perf_teardown(void);
long kvm_hypercall_pv_features(struct kvm_vcpu *vcpu);
gpa_t kvm_init_stolen_time(struct kvm_vcpu *vcpu);
void kvm_update_stolen_time(struct kvm_vcpu *vcpu);
int kvm_arm_pvtime_set_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr);
int kvm_arm_pvtime_get_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr);
int kvm_arm_pvtime_has_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr);
static inline void kvm_arm_pvtime_vcpu_init(struct kvm_vcpu_arch *vcpu_arch)
{
vcpu_arch->steal.base = GPA_INVALID;
}
static inline bool kvm_arm_is_pvtime_enabled(struct kvm_vcpu_arch *vcpu_arch)
{
return (vcpu_arch->steal.base != GPA_INVALID);
}
void kvm_set_sei_esr(struct kvm_vcpu *vcpu, u64 syndrome);
struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);

9
arch/arm64/include/asm/paravirt.h
View File

@ -21,6 +21,13 @@ static inline u64 paravirt_steal_clock(int cpu)
{
return pv_ops.time.steal_clock(cpu);
}
#endif
int __init pv_time_init(void);
#else
#define pv_time_init() do {} while (0)
#endif // CONFIG_PARAVIRT
#endif

17
arch/arm64/include/asm/pvclock-abi.h Normal file
View File

@ -0,0 +1,17 @@
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2019 Arm Ltd. */
#ifndef __ASM_PVCLOCK_ABI_H
#define __ASM_PVCLOCK_ABI_H
/* The below structure is defined in ARM DEN0057A */
struct pvclock_vcpu_stolen_time {
__le32 revision;
__le32 attributes;
__le64 stolen_time;
/* Structure must be 64 byte aligned, pad to that size */
u8 padding[48];
} __packed;
#endif

2
arch/arm64/include/uapi/asm/kvm.h
View File

@ -324,6 +324,8 @@ struct kvm_vcpu_events {
#define KVM_ARM_VCPU_TIMER_CTRL 1
#define KVM_ARM_VCPU_TIMER_IRQ_VTIMER 0
#define KVM_ARM_VCPU_TIMER_IRQ_PTIMER 1
#define KVM_ARM_VCPU_PVTIME_CTRL 2
#define KVM_ARM_VCPU_PVTIME_IPA 0
/* KVM_IRQ_LINE irq field index values */
#define KVM_ARM_IRQ_VCPU2_SHIFT 28

104
arch/arm64/kernel/cpu_errata.c
View File

@ -6,7 +6,6 @@
*/
#include <linux/arm-smccc.h>
#include <linux/psci.h>
#include <linux/types.h>
#include <linux/cpu.h>
#include <asm/cpu.h>
@ -166,9 +165,7 @@ static void install_bp_hardening_cb(bp_hardening_cb_t fn,
}
#endif /* CONFIG_KVM_INDIRECT_VECTORS */
#include <uapi/linux/psci.h>
#include <linux/arm-smccc.h>
#include <linux/psci.h>
static void call_smc_arch_workaround_1(void)
{
@ -212,43 +209,31 @@ static int detect_harden_bp_fw(void)
struct arm_smccc_res res;
u32 midr = read_cpuid_id();
if (psci_ops.smccc_version == SMCCC_VERSION_1_0)
return -1;
arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_ARCH_WORKAROUND_1, &res);
switch (psci_ops.conduit) {
case PSCI_CONDUIT_HVC:
arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_ARCH_WORKAROUND_1, &res);
switch ((int)res.a0) {
case 1:
/* Firmware says we're just fine */
return 0;
case 0:
cb = call_hvc_arch_workaround_1;
/* This is a guest, no need to patch KVM vectors */
smccc_start = NULL;
smccc_end = NULL;
break;
default:
return -1;
}
switch ((int)res.a0) {
case 1:
/* Firmware says we're just fine */
return 0;
case 0:
break;
default:
return -1;
}
switch (arm_smccc_1_1_get_conduit()) {
case SMCCC_CONDUIT_HVC:
cb = call_hvc_arch_workaround_1;
/* This is a guest, no need to patch KVM vectors */
smccc_start = NULL;
smccc_end = NULL;
break;
case PSCI_CONDUIT_SMC:
arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_ARCH_WORKAROUND_1, &res);
switch ((int)res.a0) {
case 1:
/* Firmware says we're just fine */
return 0;
case 0:
cb = call_smc_arch_workaround_1;
smccc_start = __smccc_workaround_1_smc_start;
smccc_end = __smccc_workaround_1_smc_end;
break;
default:
return -1;
}
case SMCCC_CONDUIT_SMC:
cb = call_smc_arch_workaround_1;
smccc_start = __smccc_workaround_1_smc_start;
smccc_end = __smccc_workaround_1_smc_end;
break;
default:
@ -308,11 +293,11 @@ void __init arm64_update_smccc_conduit(struct alt_instr *alt,
BUG_ON(nr_inst != 1);
switch (psci_ops.conduit) {
case PSCI_CONDUIT_HVC:
switch (arm_smccc_1_1_get_conduit()) {
case SMCCC_CONDUIT_HVC:
insn = aarch64_insn_get_hvc_value();
break;
case PSCI_CONDUIT_SMC:
case SMCCC_CONDUIT_SMC:
insn = aarch64_insn_get_smc_value();
break;
default:
@ -338,6 +323,8 @@ void __init arm64_enable_wa2_handling(struct alt_instr *alt,
void arm64_set_ssbd_mitigation(bool state)
{
int conduit;
if (!IS_ENABLED(CONFIG_ARM64_SSBD)) {
pr_info_once("SSBD disabled by kernel configuration\n");
return;
@ -351,19 +338,10 @@ void arm64_set_ssbd_mitigation(bool state)
return;
}
switch (psci_ops.conduit) {
case PSCI_CONDUIT_HVC:
arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL);
break;
conduit = arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_WORKAROUND_2, state,
NULL);
case PSCI_CONDUIT_SMC:
arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL);
break;
default:
WARN_ON_ONCE(1);
break;
}
WARN_ON_ONCE(conduit == SMCCC_CONDUIT_NONE);
}
static bool has_ssbd_mitigation(const struct arm64_cpu_capabilities *entry,
@ -373,6 +351,7 @@ static bool has_ssbd_mitigation(const struct arm64_cpu_capabilities *entry,
bool required = true;
s32 val;
bool this_cpu_safe = false;
int conduit;
WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
@ -390,25 +369,10 @@ static bool has_ssbd_mitigation(const struct arm64_cpu_capabilities *entry,
goto out_printmsg;
}
if (psci_ops.smccc_version == SMCCC_VERSION_1_0) {
ssbd_state = ARM64_SSBD_UNKNOWN;
if (!this_cpu_safe)
__ssb_safe = false;
return false;
}
conduit = arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_ARCH_WORKAROUND_2, &res);
switch (psci_ops.conduit) {
case PSCI_CONDUIT_HVC:
arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_ARCH_WORKAROUND_2, &res);
break;
case PSCI_CONDUIT_SMC:
arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_ARCH_WORKAROUND_2, &res);
break;
default:
if (conduit == SMCCC_CONDUIT_NONE) {
ssbd_state = ARM64_SSBD_UNKNOWN;
if (!this_cpu_safe)
__ssb_safe = false;

140
arch/arm64/kernel/paravirt.c
View File

@ -6,13 +6,153 @@
* Author: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
*/
#define pr_fmt(fmt) "arm-pv: " fmt
#include <linux/arm-smccc.h>
#include <linux/cpuhotplug.h>
#include <linux/export.h>
#include <linux/io.h>
#include <linux/jump_label.h>
#include <linux/printk.h>
#include <linux/psci.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <asm/paravirt.h>
#include <asm/pvclock-abi.h>
#include <asm/smp_plat.h>
struct static_key paravirt_steal_enabled;
struct static_key paravirt_steal_rq_enabled;
struct paravirt_patch_template pv_ops;
EXPORT_SYMBOL_GPL(pv_ops);
struct pv_time_stolen_time_region {
struct pvclock_vcpu_stolen_time *kaddr;
};
static DEFINE_PER_CPU(struct pv_time_stolen_time_region, stolen_time_region);
static bool steal_acc = true;
static int __init parse_no_stealacc(char *arg)
{
steal_acc = false;
return 0;
}
early_param("no-steal-acc", parse_no_stealacc);
/* return stolen time in ns by asking the hypervisor */
static u64 pv_steal_clock(int cpu)
{
struct pv_time_stolen_time_region *reg;
reg = per_cpu_ptr(&stolen_time_region, cpu);
if (!reg->kaddr) {
pr_warn_once("stolen time enabled but not configured for cpu %d\n",
cpu);
return 0;
}
return le64_to_cpu(READ_ONCE(reg->kaddr->stolen_time));
}
static int stolen_time_dying_cpu(unsigned int cpu)
{
struct pv_time_stolen_time_region *reg;
reg = this_cpu_ptr(&stolen_time_region);
if (!reg->kaddr)
return 0;
memunmap(reg->kaddr);
memset(reg, 0, sizeof(*reg));
return 0;
}
static int init_stolen_time_cpu(unsigned int cpu)
{
struct pv_time_stolen_time_region *reg;
struct arm_smccc_res res;
reg = this_cpu_ptr(&stolen_time_region);
arm_smccc_1_1_invoke(ARM_SMCCC_HV_PV_TIME_ST, &res);
if (res.a0 == SMCCC_RET_NOT_SUPPORTED)
return -EINVAL;
reg->kaddr = memremap(res.a0,
sizeof(struct pvclock_vcpu_stolen_time),
MEMREMAP_WB);
if (!reg->kaddr) {
pr_warn("Failed to map stolen time data structure\n");
return -ENOMEM;
}
if (le32_to_cpu(reg->kaddr->revision) != 0 ||
le32_to_cpu(reg->kaddr->attributes) != 0) {
pr_warn_once("Unexpected revision or attributes in stolen time data\n");
return -ENXIO;
}
return 0;
}
static int pv_time_init_stolen_time(void)
{
int ret;
ret = cpuhp_setup_state(CPUHP_AP_ARM_KVMPV_STARTING,
"hypervisor/arm/pvtime:starting",
init_stolen_time_cpu, stolen_time_dying_cpu);
if (ret < 0)
return ret;
return 0;
}
static bool has_pv_steal_clock(void)
{
struct arm_smccc_res res;
/* To detect the presence of PV time support we require SMCCC 1.1+ */
if (psci_ops.smccc_version < SMCCC_VERSION_1_1)
return false;
arm_smccc_1_1_invoke(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_HV_PV_TIME_FEATURES, &res);
if (res.a0 != SMCCC_RET_SUCCESS)
return false;
arm_smccc_1_1_invoke(ARM_SMCCC_HV_PV_TIME_FEATURES,
ARM_SMCCC_HV_PV_TIME_ST, &res);
return (res.a0 == SMCCC_RET_SUCCESS);
}
int __init pv_time_init(void)
{
int ret;
if (!has_pv_steal_clock())
return 0;
ret = pv_time_init_stolen_time();
if (ret)
return ret;
pv_ops.time.steal_clock = pv_steal_clock;
static_key_slow_inc(&paravirt_steal_enabled);
if (steal_acc)
static_key_slow_inc(&paravirt_steal_rq_enabled);
pr_info("using stolen time PV\n");
return 0;
}

3
arch/arm64/kernel/sdei.c
View File

@ -2,6 +2,7 @@
// Copyright (C) 2017 Arm Ltd.
#define pr_fmt(fmt) "sdei: " fmt
#include <linux/arm-smccc.h>
#include <linux/arm_sdei.h>
#include <linux/hardirq.h>
#include <linux/irqflags.h>
@ -161,7 +162,7 @@ unsigned long sdei_arch_get_entry_point(int conduit)
return 0;
}
sdei_exit_mode = (conduit == CONDUIT_HVC) ? SDEI_EXIT_HVC : SDEI_EXIT_SMC;
sdei_exit_mode = (conduit == SMCCC_CONDUIT_HVC) ? SDEI_EXIT_HVC : SDEI_EXIT_SMC;
#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
if (arm64_kernel_unmapped_at_el0()) {

3
arch/arm64/kernel/time.c
View File

@ -30,6 +30,7 @@
#include <asm/thread_info.h>
#include <asm/stacktrace.h>
#include <asm/paravirt.h>
unsigned long profile_pc(struct pt_regs *regs)
{
@ -65,4 +66,6 @@ void __init time_init(void)
/* Calibrate the delay loop directly */
lpj_fine = arch_timer_rate / HZ;
pv_time_init();
}

4
arch/arm64/kvm/Kconfig
View File

@ -21,6 +21,8 @@ if VIRTUALIZATION
config KVM
bool "Kernel-based Virtual Machine (KVM) support"
depends on OF
# for TASKSTATS/TASK_DELAY_ACCT:
depends on NET && MULTIUSER
select MMU_NOTIFIER
select PREEMPT_NOTIFIERS
select HAVE_KVM_CPU_RELAX_INTERCEPT
@ -39,6 +41,8 @@ config KVM
select IRQ_BYPASS_MANAGER
select HAVE_KVM_IRQ_BYPASS
select HAVE_KVM_VCPU_RUN_PID_CHANGE
select TASKSTATS
select TASK_DELAY_ACCT
---help---
Support hosting virtualized guest machines.
We don't support KVM with 16K page tables yet, due to the multiple

2
arch/arm64/kvm/Makefile
View File

@ -13,6 +13,8 @@ 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) += $(KVM)/arm/pvtime.o
kvm-$(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

9
arch/arm64/kvm/guest.c
View File

@ -868,6 +868,9 @@ int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
case KVM_ARM_VCPU_TIMER_CTRL:
ret = kvm_arm_timer_set_attr(vcpu, attr);
break;
case KVM_ARM_VCPU_PVTIME_CTRL:
ret = kvm_arm_pvtime_set_attr(vcpu, attr);
break;
default:
ret = -ENXIO;
break;
@ -888,6 +891,9 @@ int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
case KVM_ARM_VCPU_TIMER_CTRL:
ret = kvm_arm_timer_get_attr(vcpu, attr);
break;
case KVM_ARM_VCPU_PVTIME_CTRL:
ret = kvm_arm_pvtime_get_attr(vcpu, attr);
break;
default:
ret = -ENXIO;
break;
@ -908,6 +914,9 @@ int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
case KVM_ARM_VCPU_TIMER_CTRL:
ret = kvm_arm_timer_has_attr(vcpu, attr);
break;
case KVM_ARM_VCPU_PVTIME_CTRL:
ret = kvm_arm_pvtime_has_attr(vcpu, attr);
break;
default:
ret = -ENXIO;
break;

4
arch/arm64/kvm/handle_exit.c
View File

@ -11,8 +11,6 @@
#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>
@ -22,6 +20,8 @@
#include <asm/debug-monitors.h>
#include <asm/traps.h>
#include <kvm/arm_hypercalls.h>
#define CREATE_TRACE_POINTS
#include "trace.h"

12
drivers/firmware/arm_sdei.c
View File

@ -967,29 +967,29 @@ static int sdei_get_conduit(struct platform_device *pdev)
if (np) {
if (of_property_read_string(np, "method", &method)) {
pr_warn("missing \"method\" property\n");
return CONDUIT_INVALID;
return SMCCC_CONDUIT_NONE;
}
if (!strcmp("hvc", method)) {
sdei_firmware_call = &sdei_smccc_hvc;
return CONDUIT_HVC;
return SMCCC_CONDUIT_HVC;
} else if (!strcmp("smc", method)) {
sdei_firmware_call = &sdei_smccc_smc;
return CONDUIT_SMC;
return SMCCC_CONDUIT_SMC;
}
pr_warn("invalid \"method\" property: %s\n", method);
} else if (IS_ENABLED(CONFIG_ACPI) && !acpi_disabled) {
if (acpi_psci_use_hvc()) {
sdei_firmware_call = &sdei_smccc_hvc;
return CONDUIT_HVC;
return SMCCC_CONDUIT_HVC;
} else {
sdei_firmware_call = &sdei_smccc_smc;
return CONDUIT_SMC;
return SMCCC_CONDUIT_SMC;
}
}
return CONDUIT_INVALID;
return SMCCC_CONDUIT_NONE;
}
static int sdei_probe(struct platform_device *pdev)

24
drivers/firmware/psci/psci.c
View File

@ -53,10 +53,18 @@ bool psci_tos_resident_on(int cpu)
}
struct psci_operations psci_ops = {
.conduit = PSCI_CONDUIT_NONE,
.conduit = SMCCC_CONDUIT_NONE,
.smccc_version = SMCCC_VERSION_1_0,
};
enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void)
{
if (psci_ops.smccc_version < SMCCC_VERSION_1_1)
return SMCCC_CONDUIT_NONE;
return psci_ops.conduit;
}
typedef unsigned long (psci_fn)(unsigned long, unsigned long,
unsigned long, unsigned long);
static psci_fn *invoke_psci_fn;
@ -212,13 +220,13 @@ static unsigned long psci_migrate_info_up_cpu(void)
0, 0, 0);
}
static void set_conduit(enum psci_conduit conduit)
static void set_conduit(enum arm_smccc_conduit conduit)
{
switch (conduit) {
case PSCI_CONDUIT_HVC:
case SMCCC_CONDUIT_HVC:
invoke_psci_fn = __invoke_psci_fn_hvc;
break;
case PSCI_CONDUIT_SMC:
case SMCCC_CONDUIT_SMC:
invoke_psci_fn = __invoke_psci_fn_smc;
break;
default:
@ -240,9 +248,9 @@ static int get_set_conduit_method(struct device_node *np)
}
if (!strcmp("hvc", method)) {
set_conduit(PSCI_CONDUIT_HVC);
set_conduit(SMCCC_CONDUIT_HVC);
} else if (!strcmp("smc", method)) {
set_conduit(PSCI_CONDUIT_SMC);
set_conduit(SMCCC_CONDUIT_SMC);
} else {
pr_warn("invalid \"method\" property: %s\n", method);
return -EINVAL;
@ -583,9 +591,9 @@ int __init psci_acpi_init(void)
pr_info("probing for conduit method from ACPI.\n");
if (acpi_psci_use_hvc())
set_conduit(PSCI_CONDUIT_HVC);
set_conduit(SMCCC_CONDUIT_HVC);
else
set_conduit(PSCI_CONDUIT_SMC);
set_conduit(SMCCC_CONDUIT_SMC);
return psci_probe();
}

2
include/Kbuild
View File

@ -67,6 +67,8 @@ header-test- += keys/big_key-type.h
header-test- += keys/request_key_auth-type.h
header-test- += keys/trusted.h
header-test- += kvm/arm_arch_timer.h
header-test-$(CONFIG_ARM) += kvm/arm_hypercalls.h
header-test-$(CONFIG_ARM64) += kvm/arm_hypercalls.h
header-test- += kvm/arm_pmu.h
header-test-$(CONFIG_ARM) += kvm/arm_psci.h
header-test-$(CONFIG_ARM64) += kvm/arm_psci.h

43
include/kvm/arm_hypercalls.h Normal file
View File

@ -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

2
include/kvm/arm_psci.h
View File

@ -40,7 +40,7 @@ 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;

75
include/linux/arm-smccc.h
View File

@ -45,6 +45,7 @@
#define ARM_SMCCC_OWNER_SIP 2
#define ARM_SMCCC_OWNER_OEM 3
#define ARM_SMCCC_OWNER_STANDARD 4
#define ARM_SMCCC_OWNER_STANDARD_HYP 5
#define ARM_SMCCC_OWNER_TRUSTED_APP 48
#define ARM_SMCCC_OWNER_TRUSTED_APP_END 49
#define ARM_SMCCC_OWNER_TRUSTED_OS 50
@ -80,6 +81,22 @@
#include <linux/linkage.h>
#include <linux/types.h>
enum arm_smccc_conduit {
SMCCC_CONDUIT_NONE,
SMCCC_CONDUIT_SMC,
SMCCC_CONDUIT_HVC,
};
/**
* arm_smccc_1_1_get_conduit()
*
* Returns the conduit to be used for SMCCCv1.1 or later.
*
* When SMCCCv1.1 is not present, returns SMCCC_CONDUIT_NONE.
*/
enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void);
/**
* struct arm_smccc_res - Result from SMC/HVC call
* @a0-a3 result values from registers 0 to 3
@ -302,5 +319,63 @@ asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
#define SMCCC_RET_NOT_SUPPORTED -1
#define SMCCC_RET_NOT_REQUIRED -2
/*
* Like arm_smccc_1_1* but always returns SMCCC_RET_NOT_SUPPORTED.
* Used when the SMCCC conduit is not defined. The empty asm statement
* avoids compiler warnings about unused variables.
*/
#define __fail_smccc_1_1(...) \
do { \
__declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
asm ("" __constraints(__count_args(__VA_ARGS__))); \
if (___res) \
___res->a0 = SMCCC_RET_NOT_SUPPORTED; \
} while (0)
/*
* arm_smccc_1_1_invoke() - make an SMCCC v1.1 compliant call
*
* This is a variadic macro taking one to eight source arguments, and
* an optional return structure.
*
* @a0-a7: arguments passed in registers 0 to 7
* @res: result values from registers 0 to 3
*
* This macro will make either an HVC call or an SMC call depending on the
* current SMCCC conduit. If no valid conduit is available then -1
* (SMCCC_RET_NOT_SUPPORTED) is returned in @res.a0 (if supplied).
*
* The return value also provides the conduit that was used.
*/
#define arm_smccc_1_1_invoke(...) ({ \
int method = arm_smccc_1_1_get_conduit(); \
switch (method) { \
case SMCCC_CONDUIT_HVC: \
arm_smccc_1_1_hvc(__VA_ARGS__); \
break; \
case SMCCC_CONDUIT_SMC: \
arm_smccc_1_1_smc(__VA_ARGS__); \
break; \
default: \
__fail_smccc_1_1(__VA_ARGS__); \
method = SMCCC_CONDUIT_NONE; \
break; \
} \
method; \
})
/* Paravirtualised time calls (defined by ARM DEN0057A) */
#define ARM_SMCCC_HV_PV_TIME_FEATURES \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
ARM_SMCCC_SMC_64, \
ARM_SMCCC_OWNER_STANDARD_HYP, \
0x20)
#define ARM_SMCCC_HV_PV_TIME_ST \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
ARM_SMCCC_SMC_64, \
ARM_SMCCC_OWNER_STANDARD_HYP, \
0x21)
#endif /*__ASSEMBLY__*/
#endif /*__LINUX_ARM_SMCCC_H*/

6
include/linux/arm_sdei.h
View File

@ -5,12 +5,6 @@
#include <uapi/linux/arm_sdei.h>
enum sdei_conduit_types {
CONDUIT_INVALID = 0,
CONDUIT_SMC,
CONDUIT_HVC,
};
#include <acpi/ghes.h>
#ifdef CONFIG_ARM_SDE_INTERFACE

1
include/linux/cpuhotplug.h
View File

@ -136,6 +136,7 @@ enum cpuhp_state {
/* Must be the last timer callback */
CPUHP_AP_DUMMY_TIMER_STARTING,
CPUHP_AP_ARM_XEN_STARTING,
CPUHP_AP_ARM_KVMPV_STARTING,
CPUHP_AP_ARM_CORESIGHT_STARTING,
CPUHP_AP_ARM64_ISNDEP_STARTING,
CPUHP_AP_SMPCFD_DYING,

26
include/linux/kvm_host.h
View File

@ -746,6 +746,28 @@ int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
unsigned long len);
int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
gpa_t gpa, unsigned long len);
#define __kvm_put_guest(kvm, gfn, offset, value, type) \
({ \
unsigned long __addr = gfn_to_hva(kvm, gfn); \
type __user *__uaddr = (type __user *)(__addr + offset); \
int __ret = -EFAULT; \
\
if (!kvm_is_error_hva(__addr)) \
__ret = put_user(value, __uaddr); \
if (!__ret) \
mark_page_dirty(kvm, gfn); \
__ret; \
})
#define kvm_put_guest(kvm, gpa, value, type) \
({ \
gpa_t __gpa = gpa; \
struct kvm *__kvm = kvm; \
__kvm_put_guest(__kvm, __gpa >> PAGE_SHIFT, \
offset_in_page(__gpa), (value), type); \
})
int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
@ -1240,7 +1262,7 @@ extern unsigned int halt_poll_ns_grow_start;
extern unsigned int halt_poll_ns_shrink;
struct kvm_device {
struct kvm_device_ops *ops;
const struct kvm_device_ops *ops;
struct kvm *kvm;
void *private;
struct list_head vm_node;
@ -1293,7 +1315,7 @@ struct kvm_device_ops {
void kvm_device_get(struct kvm_device *dev);
void kvm_device_put(struct kvm_device *dev);
struct kvm_device *kvm_device_from_filp(struct file *filp);
int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type);
int kvm_register_device_ops(const struct kvm_device_ops *ops, u32 type);
void kvm_unregister_device_ops(u32 type);
extern struct kvm_device_ops kvm_mpic_ops;

2
include/linux/kvm_types.h
View File

@ -35,6 +35,8 @@ typedef unsigned long gva_t;
typedef u64 gpa_t;
typedef u64 gfn_t;
#define GPA_INVALID (~(gpa_t)0)
typedef unsigned long hva_t;
typedef u64 hpa_t;
typedef u64 hfn_t;

9
include/linux/psci.h
View File

@ -7,6 +7,7 @@
#ifndef __LINUX_PSCI_H
#define __LINUX_PSCI_H
#include <linux/arm-smccc.h>
#include <linux/init.h>
#include <linux/types.h>
@ -18,12 +19,6 @@ bool psci_tos_resident_on(int cpu);
int psci_cpu_suspend_enter(u32 state);
bool psci_power_state_is_valid(u32 state);
enum psci_conduit {
PSCI_CONDUIT_NONE,
PSCI_CONDUIT_SMC,
PSCI_CONDUIT_HVC,
};
enum smccc_version {
SMCCC_VERSION_1_0,
SMCCC_VERSION_1_1,
@ -38,7 +33,7 @@ struct psci_operations {
int (*affinity_info)(unsigned long target_affinity,
unsigned long lowest_affinity_level);
int (*migrate_info_type)(void);
enum psci_conduit conduit;
enum arm_smccc_conduit conduit;
enum smccc_version smccc_version;
};

2
include/uapi/linux/kvm.h
View File

@ -1235,6 +1235,8 @@ enum kvm_device_type {
#define KVM_DEV_TYPE_ARM_VGIC_ITS KVM_DEV_TYPE_ARM_VGIC_ITS
KVM_DEV_TYPE_XIVE,
#define KVM_DEV_TYPE_XIVE KVM_DEV_TYPE_XIVE
KVM_DEV_TYPE_ARM_PV_TIME,
#define KVM_DEV_TYPE_ARM_PV_TIME KVM_DEV_TYPE_ARM_PV_TIME
KVM_DEV_TYPE_MAX,
};

11
virt/kvm/arm/arm.c
View File

@ -40,6 +40,10 @@
#include <asm/kvm_coproc.h>
#include <asm/sections.h>
#include <kvm/arm_hypercalls.h>
#include <kvm/arm_pmu.h>
#include <kvm/arm_psci.h>
#ifdef REQUIRES_VIRT
__asm__(".arch_extension virt");
#endif
@ -373,6 +377,8 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
kvm_arm_reset_debug_ptr(vcpu);
kvm_arm_pvtime_vcpu_init(&vcpu->arch);
return kvm_vgic_vcpu_init(vcpu);
}
@ -402,6 +408,8 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
kvm_vcpu_load_sysregs(vcpu);
kvm_arch_vcpu_load_fp(vcpu);
kvm_vcpu_pmu_restore_guest(vcpu);
if (kvm_arm_is_pvtime_enabled(&vcpu->arch))
kvm_make_request(KVM_REQ_RECORD_STEAL, vcpu);
if (single_task_running())
vcpu_clear_wfe_traps(vcpu);
@ -667,6 +675,9 @@ static void check_vcpu_requests(struct kvm_vcpu *vcpu)
* that a VCPU sees new virtual interrupts.
*/
kvm_check_request(KVM_REQ_IRQ_PENDING, vcpu);
if (kvm_check_request(KVM_REQ_RECORD_STEAL, vcpu))
kvm_update_stolen_time(vcpu);
}
}

71
virt/kvm/arm/hypercalls.c Normal file
View File

@ -0,0 +1,71 @@
// 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);
long val = SMCCC_RET_NOT_SUPPORTED;
u32 feature;
gpa_t gpa;
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:
switch (kvm_arm_harden_branch_predictor()) {
case KVM_BP_HARDEN_UNKNOWN:
break;
case KVM_BP_HARDEN_WA_NEEDED:
val = SMCCC_RET_SUCCESS;
break;
case KVM_BP_HARDEN_NOT_REQUIRED:
val = SMCCC_RET_NOT_REQUIRED;
break;
}
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;
case ARM_SMCCC_HV_PV_TIME_FEATURES:
val = SMCCC_RET_SUCCESS;
break;
}
break;
case ARM_SMCCC_HV_PV_TIME_FEATURES:
val = kvm_hypercall_pv_features(vcpu);
break;
case ARM_SMCCC_HV_PV_TIME_ST:
gpa = kvm_init_stolen_time(vcpu);
if (gpa != GPA_INVALID)
val = gpa;
break;
default:
return kvm_psci_call(vcpu);
}
smccc_set_retval(vcpu, val, 0, 0, 0);
return 1;
}

84
virt/kvm/arm/psci.c
View File

@ -15,6 +15,7 @@
#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
@ -23,38 +24,6 @@
#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)
@ -373,7 +342,7 @@ 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:
@ -387,55 +356,6 @@ 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:
switch (kvm_arm_harden_branch_predictor()) {
case KVM_BP_HARDEN_UNKNOWN:
break;
case KVM_BP_HARDEN_WA_NEEDED:
val = SMCCC_RET_SUCCESS;
break;
case KVM_BP_HARDEN_NOT_REQUIRED:
val = SMCCC_RET_NOT_REQUIRED;
break;
}
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 3; /* PSCI version and two workaround registers */

131
virt/kvm/arm/pvtime.c Normal file
View File

@ -0,0 +1,131 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2019 Arm Ltd.
#include <linux/arm-smccc.h>
#include <linux/kvm_host.h>
#include <asm/kvm_mmu.h>
#include <asm/pvclock-abi.h>
#include <kvm/arm_hypercalls.h>
void kvm_update_stolen_time(struct kvm_vcpu *vcpu)
{
struct kvm *kvm = vcpu->kvm;
u64 steal;
__le64 steal_le;
u64 offset;
int idx;
u64 base = vcpu->arch.steal.base;
if (base == GPA_INVALID)
return;
/* Let's do the local bookkeeping */
steal = vcpu->arch.steal.steal;
steal += current->sched_info.run_delay - vcpu->arch.steal.last_steal;
vcpu->arch.steal.last_steal = current->sched_info.run_delay;
vcpu->arch.steal.steal = steal;
steal_le = cpu_to_le64(steal);
idx = srcu_read_lock(&kvm->srcu);
offset = offsetof(struct pvclock_vcpu_stolen_time, stolen_time);
kvm_put_guest(kvm, base + offset, steal_le, u64);
srcu_read_unlock(&kvm->srcu, idx);
}
long kvm_hypercall_pv_features(struct kvm_vcpu *vcpu)
{
u32 feature = smccc_get_arg1(vcpu);
long val = SMCCC_RET_NOT_SUPPORTED;
switch (feature) {
case ARM_SMCCC_HV_PV_TIME_FEATURES:
case ARM_SMCCC_HV_PV_TIME_ST:
val = SMCCC_RET_SUCCESS;
break;
}
return val;
}
gpa_t kvm_init_stolen_time(struct kvm_vcpu *vcpu)
{
struct pvclock_vcpu_stolen_time init_values = {};
struct kvm *kvm = vcpu->kvm;
u64 base = vcpu->arch.steal.base;
int idx;
if (base == GPA_INVALID)
return base;
/*
* Start counting stolen time from the time the guest requests
* the feature enabled.
*/
vcpu->arch.steal.steal = 0;
vcpu->arch.steal.last_steal = current->sched_info.run_delay;
idx = srcu_read_lock(&kvm->srcu);
kvm_write_guest(kvm, base, &init_values, sizeof(init_values));
srcu_read_unlock(&kvm->srcu, idx);
return base;
}
int kvm_arm_pvtime_set_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr)
{
u64 __user *user = (u64 __user *)attr->addr;
struct kvm *kvm = vcpu->kvm;
u64 ipa;
int ret = 0;
int idx;
if (attr->attr != KVM_ARM_VCPU_PVTIME_IPA)
return -ENXIO;
if (get_user(ipa, user))
return -EFAULT;
if (!IS_ALIGNED(ipa, 64))
return -EINVAL;
if (vcpu->arch.steal.base != GPA_INVALID)
return -EEXIST;
/* Check the address is in a valid memslot */
idx = srcu_read_lock(&kvm->srcu);
if (kvm_is_error_hva(gfn_to_hva(kvm, ipa >> PAGE_SHIFT)))
ret = -EINVAL;
srcu_read_unlock(&kvm->srcu, idx);
if (!ret)
vcpu->arch.steal.base = ipa;
return ret;
}
int kvm_arm_pvtime_get_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr)
{
u64 __user *user = (u64 __user *)attr->addr;
u64 ipa;
if (attr->attr != KVM_ARM_VCPU_PVTIME_IPA)
return -ENXIO;
ipa = vcpu->arch.steal.base;
if (put_user(ipa, user))
return -EFAULT;
return 0;
}
int kvm_arm_pvtime_has_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr)
{
switch (attr->attr) {
case KVM_ARM_VCPU_PVTIME_IPA:
return 0;
}
return -ENXIO;
}

6
virt/kvm/kvm_main.c
View File

@ -3046,14 +3046,14 @@ struct kvm_device *kvm_device_from_filp(struct file *filp)
return filp->private_data;
}
static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
static const struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
#ifdef CONFIG_KVM_MPIC
[KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops,
[KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops,
#endif
};
int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type)
int kvm_register_device_ops(const struct kvm_device_ops *ops, u32 type)
{
if (type >= ARRAY_SIZE(kvm_device_ops_table))
return -ENOSPC;
@ -3074,7 +3074,7 @@ void kvm_unregister_device_ops(u32 type)
static int kvm_ioctl_create_device(struct kvm *kvm,
struct kvm_create_device *cd)
{
struct kvm_device_ops *ops = NULL;
const struct kvm_device_ops *ops = NULL;
struct kvm_device *dev;
bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
int type;