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qemu/target/arm/kvm64.c
Colton Lewis 682814e2a3 arm64: Restore trapless ptimer access 
Due to recent KVM changes, QEMU is setting a ptimer offset resulting
in unintended trap and emulate access and a consequent performance
hit. Filter out the PTIMER_CNT register to restore trapless ptimer
access.

Quoting Andrew Jones:

Simply reading the CNT register and writing back the same value is
enough to set an offset, since the timer will have certainly moved
past whatever value was read by the time it's written.  QEMU
frequently saves and restores all registers in the get-reg-list array,
unless they've been explicitly filtered out (with Linux commit
680232a94c12, KVM_REG_ARM_PTIMER_CNT is now in the array). So, to
restore trapless ptimer accesses, we need a QEMU patch to filter out
the register.

See
https://lore.kernel.org/kvmarm/gsntttsonus5.fsf@coltonlewis-kvm.c.googlers.com/T/#m0770023762a821db2a3f0dd0a7dc6aa54e0d0da9
for additional context.

Cc: qemu-stable@nongnu.org
Signed-off-by: Andrew Jones <andrew.jones@linux.dev>
Signed-off-by: Colton Lewis <coltonlewis@google.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Colton Lewis <coltonlewis@google.com>
Message-id: 20230831190052.129045-1-coltonlewis@google.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2023-09-08 16:41:35 +01:00

1348 lines
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/*
* ARM implementation of KVM hooks, 64 bit specific code
*
* Copyright Mian-M. Hamayun 2013, Virtual Open Systems
* Copyright Alex Bennée 2014, Linaro
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include <sys/ioctl.h>
#include <sys/ptrace.h>
#include <linux/elf.h>
#include <linux/kvm.h>
#include "qapi/error.h"
#include "cpu.h"
#include "qemu/timer.h"
#include "qemu/error-report.h"
#include "qemu/host-utils.h"
#include "qemu/main-loop.h"
#include "exec/gdbstub.h"
#include "sysemu/runstate.h"
#include "sysemu/kvm.h"
#include "sysemu/kvm_int.h"
#include "kvm_arm.h"
#include "internals.h"
#include "hw/acpi/acpi.h"
#include "hw/acpi/ghes.h"
#include "hw/arm/virt.h"
static bool have_guest_debug;
void kvm_arm_init_debug(KVMState *s)
{
have_guest_debug = kvm_check_extension(s,
KVM_CAP_SET_GUEST_DEBUG);
max_hw_wps = kvm_check_extension(s, KVM_CAP_GUEST_DEBUG_HW_WPS);
hw_watchpoints = g_array_sized_new(true, true,
sizeof(HWWatchpoint), max_hw_wps);
max_hw_bps = kvm_check_extension(s, KVM_CAP_GUEST_DEBUG_HW_BPS);
hw_breakpoints = g_array_sized_new(true, true,
sizeof(HWBreakpoint), max_hw_bps);
return;
}
int kvm_arch_insert_hw_breakpoint(vaddr addr, vaddr len, int type)
{
switch (type) {
case GDB_BREAKPOINT_HW:
return insert_hw_breakpoint(addr);
break;
case GDB_WATCHPOINT_READ:
case GDB_WATCHPOINT_WRITE:
case GDB_WATCHPOINT_ACCESS:
return insert_hw_watchpoint(addr, len, type);
default:
return -ENOSYS;
}
}
int kvm_arch_remove_hw_breakpoint(vaddr addr, vaddr len, int type)
{
switch (type) {
case GDB_BREAKPOINT_HW:
return delete_hw_breakpoint(addr);
case GDB_WATCHPOINT_READ:
case GDB_WATCHPOINT_WRITE:
case GDB_WATCHPOINT_ACCESS:
return delete_hw_watchpoint(addr, len, type);
default:
return -ENOSYS;
}
}
void kvm_arch_remove_all_hw_breakpoints(void)
{
if (cur_hw_wps > 0) {
g_array_remove_range(hw_watchpoints, 0, cur_hw_wps);
}
if (cur_hw_bps > 0) {
g_array_remove_range(hw_breakpoints, 0, cur_hw_bps);
}
}
void kvm_arm_copy_hw_debug_data(struct kvm_guest_debug_arch *ptr)
{
int i;
memset(ptr, 0, sizeof(struct kvm_guest_debug_arch));
for (i = 0; i < max_hw_wps; i++) {
HWWatchpoint *wp = get_hw_wp(i);
ptr->dbg_wcr[i] = wp->wcr;
ptr->dbg_wvr[i] = wp->wvr;
}
for (i = 0; i < max_hw_bps; i++) {
HWBreakpoint *bp = get_hw_bp(i);
ptr->dbg_bcr[i] = bp->bcr;
ptr->dbg_bvr[i] = bp->bvr;
}
}
bool kvm_arm_hw_debug_active(CPUState *cs)
{
return ((cur_hw_wps > 0) || (cur_hw_bps > 0));
}
static bool kvm_arm_set_device_attr(CPUState *cs, struct kvm_device_attr *attr,
const char *name)
{
int err;
err = kvm_vcpu_ioctl(cs, KVM_HAS_DEVICE_ATTR, attr);
if (err != 0) {
error_report("%s: KVM_HAS_DEVICE_ATTR: %s", name, strerror(-err));
return false;
}
err = kvm_vcpu_ioctl(cs, KVM_SET_DEVICE_ATTR, attr);
if (err != 0) {
error_report("%s: KVM_SET_DEVICE_ATTR: %s", name, strerror(-err));
return false;
}
return true;
}
void kvm_arm_pmu_init(CPUState *cs)
{
struct kvm_device_attr attr = {
.group = KVM_ARM_VCPU_PMU_V3_CTRL,
.attr = KVM_ARM_VCPU_PMU_V3_INIT,
};
if (!ARM_CPU(cs)->has_pmu) {
return;
}
if (!kvm_arm_set_device_attr(cs, &attr, "PMU")) {
error_report("failed to init PMU");
abort();
}
}
void kvm_arm_pmu_set_irq(CPUState *cs, int irq)
{
struct kvm_device_attr attr = {
.group = KVM_ARM_VCPU_PMU_V3_CTRL,
.addr = (intptr_t)&irq,
.attr = KVM_ARM_VCPU_PMU_V3_IRQ,
};
if (!ARM_CPU(cs)->has_pmu) {
return;
}
if (!kvm_arm_set_device_attr(cs, &attr, "PMU")) {
error_report("failed to set irq for PMU");
abort();
}
}
void kvm_arm_pvtime_init(CPUState *cs, uint64_t ipa)
{
struct kvm_device_attr attr = {
.group = KVM_ARM_VCPU_PVTIME_CTRL,
.attr = KVM_ARM_VCPU_PVTIME_IPA,
.addr = (uint64_t)&ipa,
};
if (ARM_CPU(cs)->kvm_steal_time == ON_OFF_AUTO_OFF) {
return;
}
if (!kvm_arm_set_device_attr(cs, &attr, "PVTIME IPA")) {
error_report("failed to init PVTIME IPA");
abort();
}
}
static int read_sys_reg32(int fd, uint32_t *pret, uint64_t id)
{
uint64_t ret;
struct kvm_one_reg idreg = { .id = id, .addr = (uintptr_t)&ret };
int err;
assert((id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64);
err = ioctl(fd, KVM_GET_ONE_REG, &idreg);
if (err < 0) {
return -1;
}
*pret = ret;
return 0;
}
static int read_sys_reg64(int fd, uint64_t *pret, uint64_t id)
{
struct kvm_one_reg idreg = { .id = id, .addr = (uintptr_t)pret };
assert((id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64);
return ioctl(fd, KVM_GET_ONE_REG, &idreg);
}
static bool kvm_arm_pauth_supported(void)
{
return (kvm_check_extension(kvm_state, KVM_CAP_ARM_PTRAUTH_ADDRESS) &&
kvm_check_extension(kvm_state, KVM_CAP_ARM_PTRAUTH_GENERIC));
}
bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf)
{
/* Identify the feature bits corresponding to the host CPU, and
* fill out the ARMHostCPUClass fields accordingly. To do this
* we have to create a scratch VM, create a single CPU inside it,
* and then query that CPU for the relevant ID registers.
*/
int fdarray[3];
bool sve_supported;
bool pmu_supported = false;
uint64_t features = 0;
int err;
/* Old kernels may not know about the PREFERRED_TARGET ioctl: however
* we know these will only support creating one kind of guest CPU,
* which is its preferred CPU type. Fortunately these old kernels
* support only a very limited number of CPUs.
*/
static const uint32_t cpus_to_try[] = {
KVM_ARM_TARGET_AEM_V8,
KVM_ARM_TARGET_FOUNDATION_V8,
KVM_ARM_TARGET_CORTEX_A57,
QEMU_KVM_ARM_TARGET_NONE
};
/*
* target = -1 informs kvm_arm_create_scratch_host_vcpu()
* to use the preferred target
*/
struct kvm_vcpu_init init = { .target = -1, };
/*
* Ask for SVE if supported, so that we can query ID_AA64ZFR0,
* which is otherwise RAZ.
*/
sve_supported = kvm_arm_sve_supported();
if (sve_supported) {
init.features[0] |= 1 << KVM_ARM_VCPU_SVE;
}
/*
* Ask for Pointer Authentication if supported, so that we get
* the unsanitized field values for AA64ISAR1_EL1.
*/
if (kvm_arm_pauth_supported()) {
init.features[0] |= (1 << KVM_ARM_VCPU_PTRAUTH_ADDRESS |
1 << KVM_ARM_VCPU_PTRAUTH_GENERIC);
}
if (kvm_arm_pmu_supported()) {
init.features[0] |= 1 << KVM_ARM_VCPU_PMU_V3;
pmu_supported = true;
}
if (!kvm_arm_create_scratch_host_vcpu(cpus_to_try, fdarray, &init)) {
return false;
}
ahcf->target = init.target;
ahcf->dtb_compatible = "arm,arm-v8";
err = read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64pfr0,
ARM64_SYS_REG(3, 0, 0, 4, 0));
if (unlikely(err < 0)) {
/*
* Before v4.15, the kernel only exposed a limited number of system
* registers, not including any of the interesting AArch64 ID regs.
* For the most part we could leave these fields as zero with minimal
* effect, since this does not affect the values seen by the guest.
*
* However, it could cause problems down the line for QEMU,
* so provide a minimal v8.0 default.
*
* ??? Could read MIDR and use knowledge from cpu64.c.
* ??? Could map a page of memory into our temp guest and
* run the tiniest of hand-crafted kernels to extract
* the values seen by the guest.
* ??? Either of these sounds like too much effort just
* to work around running a modern host kernel.
*/
ahcf->isar.id_aa64pfr0 = 0x00000011; /* EL1&0, AArch64 only */
err = 0;
} else {
err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64pfr1,
ARM64_SYS_REG(3, 0, 0, 4, 1));
err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64smfr0,
ARM64_SYS_REG(3, 0, 0, 4, 5));
err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64dfr0,
ARM64_SYS_REG(3, 0, 0, 5, 0));
err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64dfr1,
ARM64_SYS_REG(3, 0, 0, 5, 1));
err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64isar0,
ARM64_SYS_REG(3, 0, 0, 6, 0));
err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64isar1,
ARM64_SYS_REG(3, 0, 0, 6, 1));
err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64isar2,
ARM64_SYS_REG(3, 0, 0, 6, 2));
err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64mmfr0,
ARM64_SYS_REG(3, 0, 0, 7, 0));
err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64mmfr1,
ARM64_SYS_REG(3, 0, 0, 7, 1));
err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64mmfr2,
ARM64_SYS_REG(3, 0, 0, 7, 2));
/*
* Note that if AArch32 support is not present in the host,
* the AArch32 sysregs are present to be read, but will
* return UNKNOWN values. This is neither better nor worse
* than skipping the reads and leaving 0, as we must avoid
* considering the values in every case.
*/
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_pfr0,
ARM64_SYS_REG(3, 0, 0, 1, 0));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_pfr1,
ARM64_SYS_REG(3, 0, 0, 1, 1));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_dfr0,
ARM64_SYS_REG(3, 0, 0, 1, 2));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_mmfr0,
ARM64_SYS_REG(3, 0, 0, 1, 4));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_mmfr1,
ARM64_SYS_REG(3, 0, 0, 1, 5));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_mmfr2,
ARM64_SYS_REG(3, 0, 0, 1, 6));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_mmfr3,
ARM64_SYS_REG(3, 0, 0, 1, 7));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar0,
ARM64_SYS_REG(3, 0, 0, 2, 0));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar1,
ARM64_SYS_REG(3, 0, 0, 2, 1));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar2,
ARM64_SYS_REG(3, 0, 0, 2, 2));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar3,
ARM64_SYS_REG(3, 0, 0, 2, 3));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar4,
ARM64_SYS_REG(3, 0, 0, 2, 4));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar5,
ARM64_SYS_REG(3, 0, 0, 2, 5));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_mmfr4,
ARM64_SYS_REG(3, 0, 0, 2, 6));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_isar6,
ARM64_SYS_REG(3, 0, 0, 2, 7));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.mvfr0,
ARM64_SYS_REG(3, 0, 0, 3, 0));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.mvfr1,
ARM64_SYS_REG(3, 0, 0, 3, 1));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.mvfr2,
ARM64_SYS_REG(3, 0, 0, 3, 2));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_pfr2,
ARM64_SYS_REG(3, 0, 0, 3, 4));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_dfr1,
ARM64_SYS_REG(3, 0, 0, 3, 5));
err |= read_sys_reg32(fdarray[2], &ahcf->isar.id_mmfr5,
ARM64_SYS_REG(3, 0, 0, 3, 6));
/*
* DBGDIDR is a bit complicated because the kernel doesn't
* provide an accessor for it in 64-bit mode, which is what this
* scratch VM is in, and there's no architected "64-bit sysreg
* which reads the same as the 32-bit register" the way there is
* for other ID registers. Instead we synthesize a value from the
* AArch64 ID_AA64DFR0, the same way the kernel code in
* arch/arm64/kvm/sys_regs.c:trap_dbgidr() does.
* We only do this if the CPU supports AArch32 at EL1.
*/
if (FIELD_EX32(ahcf->isar.id_aa64pfr0, ID_AA64PFR0, EL1) >= 2) {
int wrps = FIELD_EX64(ahcf->isar.id_aa64dfr0, ID_AA64DFR0, WRPS);
int brps = FIELD_EX64(ahcf->isar.id_aa64dfr0, ID_AA64DFR0, BRPS);
int ctx_cmps =
FIELD_EX64(ahcf->isar.id_aa64dfr0, ID_AA64DFR0, CTX_CMPS);
int version = 6; /* ARMv8 debug architecture */
bool has_el3 =
!!FIELD_EX32(ahcf->isar.id_aa64pfr0, ID_AA64PFR0, EL3);
uint32_t dbgdidr = 0;
dbgdidr = FIELD_DP32(dbgdidr, DBGDIDR, WRPS, wrps);
dbgdidr = FIELD_DP32(dbgdidr, DBGDIDR, BRPS, brps);
dbgdidr = FIELD_DP32(dbgdidr, DBGDIDR, CTX_CMPS, ctx_cmps);
dbgdidr = FIELD_DP32(dbgdidr, DBGDIDR, VERSION, version);
dbgdidr = FIELD_DP32(dbgdidr, DBGDIDR, NSUHD_IMP, has_el3);
dbgdidr = FIELD_DP32(dbgdidr, DBGDIDR, SE_IMP, has_el3);
dbgdidr |= (1 << 15); /* RES1 bit */
ahcf->isar.dbgdidr = dbgdidr;
}
if (pmu_supported) {
/* PMCR_EL0 is only accessible if the vCPU has feature PMU_V3 */
err |= read_sys_reg64(fdarray[2], &ahcf->isar.reset_pmcr_el0,
ARM64_SYS_REG(3, 3, 9, 12, 0));
}
if (sve_supported) {
/*
* There is a range of kernels between kernel commit 73433762fcae
* and f81cb2c3ad41 which have a bug where the kernel doesn't
* expose SYS_ID_AA64ZFR0_EL1 via the ONE_REG API unless the VM has
* enabled SVE support, which resulted in an error rather than RAZ.
* So only read the register if we set KVM_ARM_VCPU_SVE above.
*/
err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64zfr0,
ARM64_SYS_REG(3, 0, 0, 4, 4));
}
}
kvm_arm_destroy_scratch_host_vcpu(fdarray);
if (err < 0) {
return false;
}
/*
* We can assume any KVM supporting CPU is at least a v8
* with VFPv4+Neon; this in turn implies most of the other
* feature bits.
*/
features |= 1ULL << ARM_FEATURE_V8;
features |= 1ULL << ARM_FEATURE_NEON;
features |= 1ULL << ARM_FEATURE_AARCH64;
features |= 1ULL << ARM_FEATURE_PMU;
features |= 1ULL << ARM_FEATURE_GENERIC_TIMER;
ahcf->features = features;
return true;
}
void kvm_arm_steal_time_finalize(ARMCPU *cpu, Error **errp)
{
bool has_steal_time = kvm_arm_steal_time_supported();
if (cpu->kvm_steal_time == ON_OFF_AUTO_AUTO) {
if (!has_steal_time || !arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
cpu->kvm_steal_time = ON_OFF_AUTO_OFF;
} else {
cpu->kvm_steal_time = ON_OFF_AUTO_ON;
}
} else if (cpu->kvm_steal_time == ON_OFF_AUTO_ON) {
if (!has_steal_time) {
error_setg(errp, "'kvm-steal-time' cannot be enabled "
"on this host");
return;
} else if (!arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
/*
* DEN0057A chapter 2 says "This specification only covers
* systems in which the Execution state of the hypervisor
* as well as EL1 of virtual machines is AArch64.". And,
* to ensure that, the smc/hvc calls are only specified as
* smc64/hvc64.
*/
error_setg(errp, "'kvm-steal-time' cannot be enabled "
"for AArch32 guests");
return;
}
}
}
bool kvm_arm_aarch32_supported(void)
{
return kvm_check_extension(kvm_state, KVM_CAP_ARM_EL1_32BIT);
}
bool kvm_arm_sve_supported(void)
{
return kvm_check_extension(kvm_state, KVM_CAP_ARM_SVE);
}
bool kvm_arm_steal_time_supported(void)
{
return kvm_check_extension(kvm_state, KVM_CAP_STEAL_TIME);
}
QEMU_BUILD_BUG_ON(KVM_ARM64_SVE_VQ_MIN != 1);
uint32_t kvm_arm_sve_get_vls(CPUState *cs)
{
/* Only call this function if kvm_arm_sve_supported() returns true. */
static uint64_t vls[KVM_ARM64_SVE_VLS_WORDS];
static bool probed;
uint32_t vq = 0;
int i;
/*
* KVM ensures all host CPUs support the same set of vector lengths.
* So we only need to create the scratch VCPUs once and then cache
* the results.
*/
if (!probed) {
struct kvm_vcpu_init init = {
.target = -1,
.features[0] = (1 << KVM_ARM_VCPU_SVE),
};
struct kvm_one_reg reg = {
.id = KVM_REG_ARM64_SVE_VLS,
.addr = (uint64_t)&vls[0],
};
int fdarray[3], ret;
probed = true;
if (!kvm_arm_create_scratch_host_vcpu(NULL, fdarray, &init)) {
error_report("failed to create scratch VCPU with SVE enabled");
abort();
}
ret = ioctl(fdarray[2], KVM_GET_ONE_REG, &reg);
kvm_arm_destroy_scratch_host_vcpu(fdarray);
if (ret) {
error_report("failed to get KVM_REG_ARM64_SVE_VLS: %s",
strerror(errno));
abort();
}
for (i = KVM_ARM64_SVE_VLS_WORDS - 1; i >= 0; --i) {
if (vls[i]) {
vq = 64 - clz64(vls[i]) + i * 64;
break;
}
}
if (vq > ARM_MAX_VQ) {
warn_report("KVM supports vector lengths larger than "
"QEMU can enable");
vls[0] &= MAKE_64BIT_MASK(0, ARM_MAX_VQ);
}
}
return vls[0];
}
static int kvm_arm_sve_set_vls(CPUState *cs)
{
ARMCPU *cpu = ARM_CPU(cs);
uint64_t vls[KVM_ARM64_SVE_VLS_WORDS] = { cpu->sve_vq.map };
struct kvm_one_reg reg = {
.id = KVM_REG_ARM64_SVE_VLS,
.addr = (uint64_t)&vls[0],
};
assert(cpu->sve_max_vq <= KVM_ARM64_SVE_VQ_MAX);
return kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
}
#define ARM_CPU_ID_MPIDR 3, 0, 0, 0, 5
int kvm_arch_init_vcpu(CPUState *cs)
{
int ret;
uint64_t mpidr;
ARMCPU *cpu = ARM_CPU(cs);
CPUARMState *env = &cpu->env;
uint64_t psciver;
if (cpu->kvm_target == QEMU_KVM_ARM_TARGET_NONE ||
!object_dynamic_cast(OBJECT(cpu), TYPE_AARCH64_CPU)) {
error_report("KVM is not supported for this guest CPU type");
return -EINVAL;
}
qemu_add_vm_change_state_handler(kvm_arm_vm_state_change, cs);
/* Determine init features for this CPU */
memset(cpu->kvm_init_features, 0, sizeof(cpu->kvm_init_features));
if (cs->start_powered_off) {
cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_POWER_OFF;
}
if (kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PSCI_0_2)) {
cpu->psci_version = QEMU_PSCI_VERSION_0_2;
cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_PSCI_0_2;
}
if (!arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_EL1_32BIT;
}
if (!kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PMU_V3)) {
cpu->has_pmu = false;
}
if (cpu->has_pmu) {
cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_PMU_V3;
} else {
env->features &= ~(1ULL << ARM_FEATURE_PMU);
}
if (cpu_isar_feature(aa64_sve, cpu)) {
assert(kvm_arm_sve_supported());
cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_SVE;
}
if (cpu_isar_feature(aa64_pauth, cpu)) {
cpu->kvm_init_features[0] |= (1 << KVM_ARM_VCPU_PTRAUTH_ADDRESS |
1 << KVM_ARM_VCPU_PTRAUTH_GENERIC);
}
/* Do KVM_ARM_VCPU_INIT ioctl */
ret = kvm_arm_vcpu_init(cs);
if (ret) {
return ret;
}
if (cpu_isar_feature(aa64_sve, cpu)) {
ret = kvm_arm_sve_set_vls(cs);
if (ret) {
return ret;
}
ret = kvm_arm_vcpu_finalize(cs, KVM_ARM_VCPU_SVE);
if (ret) {
return ret;
}
}
/*
* KVM reports the exact PSCI version it is implementing via a
* special sysreg. If it is present, use its contents to determine
* what to report to the guest in the dtb (it is the PSCI version,
* in the same 15-bits major 16-bits minor format that PSCI_VERSION
* returns).
*/
if (!kvm_get_one_reg(cs, KVM_REG_ARM_PSCI_VERSION, &psciver)) {
cpu->psci_version = psciver;
}
/*
* When KVM is in use, PSCI is emulated in-kernel and not by qemu.
* Currently KVM has its own idea about MPIDR assignment, so we
* override our defaults with what we get from KVM.
*/
ret = kvm_get_one_reg(cs, ARM64_SYS_REG(ARM_CPU_ID_MPIDR), &mpidr);
if (ret) {
return ret;
}
cpu->mp_affinity = mpidr & ARM64_AFFINITY_MASK;
/* Check whether user space can specify guest syndrome value */
kvm_arm_init_serror_injection(cs);
return kvm_arm_init_cpreg_list(cpu);
}
int kvm_arch_destroy_vcpu(CPUState *cs)
{
return 0;
}
bool kvm_arm_reg_syncs_via_cpreg_list(uint64_t regidx)
{
/* Return true if the regidx is a register we should synchronize
* via the cpreg_tuples array (ie is not a core or sve reg that
* we sync by hand in kvm_arch_get/put_registers())
*/
switch (regidx & KVM_REG_ARM_COPROC_MASK) {
case KVM_REG_ARM_CORE:
case KVM_REG_ARM64_SVE:
return false;
default:
return true;
}
}
typedef struct CPRegStateLevel {
uint64_t regidx;
int level;
} CPRegStateLevel;
/* All system registers not listed in the following table are assumed to be
* of the level KVM_PUT_RUNTIME_STATE. If a register should be written less
* often, you must add it to this table with a state of either
* KVM_PUT_RESET_STATE or KVM_PUT_FULL_STATE.
*/
static const CPRegStateLevel non_runtime_cpregs[] = {
{ KVM_REG_ARM_TIMER_CNT, KVM_PUT_FULL_STATE },
{ KVM_REG_ARM_PTIMER_CNT, KVM_PUT_FULL_STATE },
};
int kvm_arm_cpreg_level(uint64_t regidx)
{
int i;
for (i = 0; i < ARRAY_SIZE(non_runtime_cpregs); i++) {
const CPRegStateLevel *l = &non_runtime_cpregs[i];
if (l->regidx == regidx) {
return l->level;
}
}
return KVM_PUT_RUNTIME_STATE;
}
/* Callers must hold the iothread mutex lock */
static void kvm_inject_arm_sea(CPUState *c)
{
ARMCPU *cpu = ARM_CPU(c);
CPUARMState *env = &cpu->env;
uint32_t esr;
bool same_el;
c->exception_index = EXCP_DATA_ABORT;
env->exception.target_el = 1;
/*
* Set the DFSC to synchronous external abort and set FnV to not valid,
* this will tell guest the FAR_ELx is UNKNOWN for this abort.
*/
same_el = arm_current_el(env) == env->exception.target_el;
esr = syn_data_abort_no_iss(same_el, 1, 0, 0, 0, 0, 0x10);
env->exception.syndrome = esr;
arm_cpu_do_interrupt(c);
}
#define AARCH64_CORE_REG(x) (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | \
KVM_REG_ARM_CORE | KVM_REG_ARM_CORE_REG(x))
#define AARCH64_SIMD_CORE_REG(x) (KVM_REG_ARM64 | KVM_REG_SIZE_U128 | \
KVM_REG_ARM_CORE | KVM_REG_ARM_CORE_REG(x))
#define AARCH64_SIMD_CTRL_REG(x) (KVM_REG_ARM64 | KVM_REG_SIZE_U32 | \
KVM_REG_ARM_CORE | KVM_REG_ARM_CORE_REG(x))
static int kvm_arch_put_fpsimd(CPUState *cs)
{
CPUARMState *env = &ARM_CPU(cs)->env;
struct kvm_one_reg reg;
int i, ret;
for (i = 0; i < 32; i++) {
uint64_t *q = aa64_vfp_qreg(env, i);
#if HOST_BIG_ENDIAN
uint64_t fp_val[2] = { q[1], q[0] };
reg.addr = (uintptr_t)fp_val;
#else
reg.addr = (uintptr_t)q;
#endif
reg.id = AARCH64_SIMD_CORE_REG(fp_regs.vregs[i]);
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
if (ret) {
return ret;
}
}
return 0;
}
/*
* KVM SVE registers come in slices where ZREGs have a slice size of 2048 bits
* and PREGS and the FFR have a slice size of 256 bits. However we simply hard
* code the slice index to zero for now as it's unlikely we'll need more than
* one slice for quite some time.
*/
static int kvm_arch_put_sve(CPUState *cs)
{
ARMCPU *cpu = ARM_CPU(cs);
CPUARMState *env = &cpu->env;
uint64_t tmp[ARM_MAX_VQ * 2];
uint64_t *r;
struct kvm_one_reg reg;
int n, ret;
for (n = 0; n < KVM_ARM64_SVE_NUM_ZREGS; ++n) {
r = sve_bswap64(tmp, &env->vfp.zregs[n].d[0], cpu->sve_max_vq * 2);
reg.addr = (uintptr_t)r;
reg.id = KVM_REG_ARM64_SVE_ZREG(n, 0);
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
if (ret) {
return ret;
}
}
for (n = 0; n < KVM_ARM64_SVE_NUM_PREGS; ++n) {
r = sve_bswap64(tmp, r = &env->vfp.pregs[n].p[0],
DIV_ROUND_UP(cpu->sve_max_vq * 2, 8));
reg.addr = (uintptr_t)r;
reg.id = KVM_REG_ARM64_SVE_PREG(n, 0);
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
if (ret) {
return ret;
}
}
r = sve_bswap64(tmp, &env->vfp.pregs[FFR_PRED_NUM].p[0],
DIV_ROUND_UP(cpu->sve_max_vq * 2, 8));
reg.addr = (uintptr_t)r;
reg.id = KVM_REG_ARM64_SVE_FFR(0);
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
if (ret) {
return ret;
}
return 0;
}
int kvm_arch_put_registers(CPUState *cs, int level)
{
struct kvm_one_reg reg;
uint64_t val;
uint32_t fpr;
int i, ret;
unsigned int el;
ARMCPU *cpu = ARM_CPU(cs);
CPUARMState *env = &cpu->env;
/* If we are in AArch32 mode then we need to copy the AArch32 regs to the
* AArch64 registers before pushing them out to 64-bit KVM.
*/
if (!is_a64(env)) {
aarch64_sync_32_to_64(env);
}
for (i = 0; i < 31; i++) {
reg.id = AARCH64_CORE_REG(regs.regs[i]);
reg.addr = (uintptr_t) &env->xregs[i];
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
if (ret) {
return ret;
}
}
/* KVM puts SP_EL0 in regs.sp and SP_EL1 in regs.sp_el1. On the
* QEMU side we keep the current SP in xregs[31] as well.
*/
aarch64_save_sp(env, 1);
reg.id = AARCH64_CORE_REG(regs.sp);
reg.addr = (uintptr_t) &env->sp_el[0];
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
if (ret) {
return ret;
}
reg.id = AARCH64_CORE_REG(sp_el1);
reg.addr = (uintptr_t) &env->sp_el[1];
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
if (ret) {
return ret;
}
/* Note that KVM thinks pstate is 64 bit but we use a uint32_t */
if (is_a64(env)) {
val = pstate_read(env);
} else {
val = cpsr_read(env);
}
reg.id = AARCH64_CORE_REG(regs.pstate);
reg.addr = (uintptr_t) &val;
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
if (ret) {
return ret;
}
reg.id = AARCH64_CORE_REG(regs.pc);
reg.addr = (uintptr_t) &env->pc;
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
if (ret) {
return ret;
}
reg.id = AARCH64_CORE_REG(elr_el1);
reg.addr = (uintptr_t) &env->elr_el[1];
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
if (ret) {
return ret;
}
/* Saved Program State Registers
*
* Before we restore from the banked_spsr[] array we need to
* ensure that any modifications to env->spsr are correctly
* reflected in the banks.
*/
el = arm_current_el(env);
if (el > 0 && !is_a64(env)) {
i = bank_number(env->uncached_cpsr & CPSR_M);
env->banked_spsr[i] = env->spsr;
}
/* KVM 0-4 map to QEMU banks 1-5 */
for (i = 0; i < KVM_NR_SPSR; i++) {
reg.id = AARCH64_CORE_REG(spsr[i]);
reg.addr = (uintptr_t) &env->banked_spsr[i + 1];
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
if (ret) {
return ret;
}
}
if (cpu_isar_feature(aa64_sve, cpu)) {
ret = kvm_arch_put_sve(cs);
} else {
ret = kvm_arch_put_fpsimd(cs);
}
if (ret) {
return ret;
}
reg.addr = (uintptr_t)(&fpr);
fpr = vfp_get_fpsr(env);
reg.id = AARCH64_SIMD_CTRL_REG(fp_regs.fpsr);
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
if (ret) {
return ret;
}
reg.addr = (uintptr_t)(&fpr);
fpr = vfp_get_fpcr(env);
reg.id = AARCH64_SIMD_CTRL_REG(fp_regs.fpcr);
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
if (ret) {
return ret;
}
write_cpustate_to_list(cpu, true);
if (!write_list_to_kvmstate(cpu, level)) {
return -EINVAL;
}
/*
* Setting VCPU events should be triggered after syncing the registers
* to avoid overwriting potential changes made by KVM upon calling
* KVM_SET_VCPU_EVENTS ioctl
*/
ret = kvm_put_vcpu_events(cpu);
if (ret) {
return ret;
}
kvm_arm_sync_mpstate_to_kvm(cpu);
return ret;
}
static int kvm_arch_get_fpsimd(CPUState *cs)
{
CPUARMState *env = &ARM_CPU(cs)->env;
struct kvm_one_reg reg;
int i, ret;
for (i = 0; i < 32; i++) {
uint64_t *q = aa64_vfp_qreg(env, i);
reg.id = AARCH64_SIMD_CORE_REG(fp_regs.vregs[i]);
reg.addr = (uintptr_t)q;
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
if (ret) {
return ret;
} else {
#if HOST_BIG_ENDIAN
uint64_t t;
t = q[0], q[0] = q[1], q[1] = t;
#endif
}
}
return 0;
}
/*
* KVM SVE registers come in slices where ZREGs have a slice size of 2048 bits
* and PREGS and the FFR have a slice size of 256 bits. However we simply hard
* code the slice index to zero for now as it's unlikely we'll need more than
* one slice for quite some time.
*/
static int kvm_arch_get_sve(CPUState *cs)
{
ARMCPU *cpu = ARM_CPU(cs);
CPUARMState *env = &cpu->env;
struct kvm_one_reg reg;
uint64_t *r;
int n, ret;
for (n = 0; n < KVM_ARM64_SVE_NUM_ZREGS; ++n) {
r = &env->vfp.zregs[n].d[0];
reg.addr = (uintptr_t)r;
reg.id = KVM_REG_ARM64_SVE_ZREG(n, 0);
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
if (ret) {
return ret;
}
sve_bswap64(r, r, cpu->sve_max_vq * 2);
}
for (n = 0; n < KVM_ARM64_SVE_NUM_PREGS; ++n) {
r = &env->vfp.pregs[n].p[0];
reg.addr = (uintptr_t)r;
reg.id = KVM_REG_ARM64_SVE_PREG(n, 0);
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
if (ret) {
return ret;
}
sve_bswap64(r, r, DIV_ROUND_UP(cpu->sve_max_vq * 2, 8));
}
r = &env->vfp.pregs[FFR_PRED_NUM].p[0];
reg.addr = (uintptr_t)r;
reg.id = KVM_REG_ARM64_SVE_FFR(0);
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
if (ret) {
return ret;
}
sve_bswap64(r, r, DIV_ROUND_UP(cpu->sve_max_vq * 2, 8));
return 0;
}
int kvm_arch_get_registers(CPUState *cs)
{
struct kvm_one_reg reg;
uint64_t val;
unsigned int el;
uint32_t fpr;
int i, ret;
ARMCPU *cpu = ARM_CPU(cs);
CPUARMState *env = &cpu->env;
for (i = 0; i < 31; i++) {
reg.id = AARCH64_CORE_REG(regs.regs[i]);
reg.addr = (uintptr_t) &env->xregs[i];
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
if (ret) {
return ret;
}
}
reg.id = AARCH64_CORE_REG(regs.sp);
reg.addr = (uintptr_t) &env->sp_el[0];
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
if (ret) {
return ret;
}
reg.id = AARCH64_CORE_REG(sp_el1);
reg.addr = (uintptr_t) &env->sp_el[1];
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
if (ret) {
return ret;
}
reg.id = AARCH64_CORE_REG(regs.pstate);
reg.addr = (uintptr_t) &val;
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
if (ret) {
return ret;
}
env->aarch64 = ((val & PSTATE_nRW) == 0);
if (is_a64(env)) {
pstate_write(env, val);
} else {
cpsr_write(env, val, 0xffffffff, CPSRWriteRaw);
}
/* KVM puts SP_EL0 in regs.sp and SP_EL1 in regs.sp_el1. On the
* QEMU side we keep the current SP in xregs[31] as well.
*/
aarch64_restore_sp(env, 1);
reg.id = AARCH64_CORE_REG(regs.pc);
reg.addr = (uintptr_t) &env->pc;
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
if (ret) {
return ret;
}
/* If we are in AArch32 mode then we need to sync the AArch32 regs with the
* incoming AArch64 regs received from 64-bit KVM.
* We must perform this after all of the registers have been acquired from
* the kernel.
*/
if (!is_a64(env)) {
aarch64_sync_64_to_32(env);
}
reg.id = AARCH64_CORE_REG(elr_el1);
reg.addr = (uintptr_t) &env->elr_el[1];
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
if (ret) {
return ret;
}
/* Fetch the SPSR registers
*
* KVM SPSRs 0-4 map to QEMU banks 1-5
*/
for (i = 0; i < KVM_NR_SPSR; i++) {
reg.id = AARCH64_CORE_REG(spsr[i]);
reg.addr = (uintptr_t) &env->banked_spsr[i + 1];
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
if (ret) {
return ret;
}
}
el = arm_current_el(env);
if (el > 0 && !is_a64(env)) {
i = bank_number(env->uncached_cpsr & CPSR_M);
env->spsr = env->banked_spsr[i];
}
if (cpu_isar_feature(aa64_sve, cpu)) {
ret = kvm_arch_get_sve(cs);
} else {
ret = kvm_arch_get_fpsimd(cs);
}
if (ret) {
return ret;
}
reg.addr = (uintptr_t)(&fpr);
reg.id = AARCH64_SIMD_CTRL_REG(fp_regs.fpsr);
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
if (ret) {
return ret;
}
vfp_set_fpsr(env, fpr);
reg.addr = (uintptr_t)(&fpr);
reg.id = AARCH64_SIMD_CTRL_REG(fp_regs.fpcr);
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
if (ret) {
return ret;
}
vfp_set_fpcr(env, fpr);
ret = kvm_get_vcpu_events(cpu);
if (ret) {
return ret;
}
if (!write_kvmstate_to_list(cpu)) {
return -EINVAL;
}
/* Note that it's OK to have registers which aren't in CPUState,
* so we can ignore a failure return here.
*/
write_list_to_cpustate(cpu);
kvm_arm_sync_mpstate_to_qemu(cpu);
/* TODO: other registers */
return ret;
}
void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, void *addr)
{
ram_addr_t ram_addr;
hwaddr paddr;
assert(code == BUS_MCEERR_AR || code == BUS_MCEERR_AO);
if (acpi_ghes_present() && addr) {
ram_addr = qemu_ram_addr_from_host(addr);
if (ram_addr != RAM_ADDR_INVALID &&
kvm_physical_memory_addr_from_host(c->kvm_state, addr, &paddr)) {
kvm_hwpoison_page_add(ram_addr);
/*
* If this is a BUS_MCEERR_AR, we know we have been called
* synchronously from the vCPU thread, so we can easily
* synchronize the state and inject an error.
*
* TODO: we currently don't tell the guest at all about
* BUS_MCEERR_AO. In that case we might either be being
* called synchronously from the vCPU thread, or a bit
* later from the main thread, so doing the injection of
* the error would be more complicated.
*/
if (code == BUS_MCEERR_AR) {
kvm_cpu_synchronize_state(c);
if (!acpi_ghes_record_errors(ACPI_HEST_SRC_ID_SEA, paddr)) {
kvm_inject_arm_sea(c);
} else {
error_report("failed to record the error");
abort();
}
}
return;
}
if (code == BUS_MCEERR_AO) {
error_report("Hardware memory error at addr %p for memory used by "
"QEMU itself instead of guest system!", addr);
}
}
if (code == BUS_MCEERR_AR) {
error_report("Hardware memory error!");
exit(1);
}
}
/* C6.6.29 BRK instruction */
static const uint32_t brk_insn = 0xd4200000;
int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
{
if (have_guest_debug) {
if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&brk_insn, 4, 1)) {
return -EINVAL;
}
return 0;
} else {
error_report("guest debug not supported on this kernel");
return -EINVAL;
}
}
int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
{
static uint32_t brk;
if (have_guest_debug) {
if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&brk, 4, 0) ||
brk != brk_insn ||
cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 4, 1)) {
return -EINVAL;
}
return 0;
} else {
error_report("guest debug not supported on this kernel");
return -EINVAL;
}
}
/* See v8 ARM ARM D7.2.27 ESR_ELx, Exception Syndrome Register
*
* To minimise translating between kernel and user-space the kernel
* ABI just provides user-space with the full exception syndrome
* register value to be decoded in QEMU.
*/
bool kvm_arm_handle_debug(CPUState *cs, struct kvm_debug_exit_arch *debug_exit)
{
int hsr_ec = syn_get_ec(debug_exit->hsr);
ARMCPU *cpu = ARM_CPU(cs);
CPUARMState *env = &cpu->env;
/* Ensure PC is synchronised */
kvm_cpu_synchronize_state(cs);
switch (hsr_ec) {
case EC_SOFTWARESTEP:
if (cs->singlestep_enabled) {
return true;
} else {
/*
* The kernel should have suppressed the guest's ability to
* single step at this point so something has gone wrong.
*/
error_report("%s: guest single-step while debugging unsupported"
" (%"PRIx64", %"PRIx32")",
__func__, env->pc, debug_exit->hsr);
return false;
}
break;
case EC_AA64_BKPT:
if (kvm_find_sw_breakpoint(cs, env->pc)) {
return true;
}
break;
case EC_BREAKPOINT:
if (find_hw_breakpoint(cs, env->pc)) {
return true;
}
break;
case EC_WATCHPOINT:
{
CPUWatchpoint *wp = find_hw_watchpoint(cs, debug_exit->far);
if (wp) {
cs->watchpoint_hit = wp;
return true;
}
break;
}
default:
error_report("%s: unhandled debug exit (%"PRIx32", %"PRIx64")",
__func__, debug_exit->hsr, env->pc);
}
/* If we are not handling the debug exception it must belong to
* the guest. Let's re-use the existing TCG interrupt code to set
* everything up properly.
*/
cs->exception_index = EXCP_BKPT;
env->exception.syndrome = debug_exit->hsr;
env->exception.vaddress = debug_exit->far;
env->exception.target_el = 1;
qemu_mutex_lock_iothread();
arm_cpu_do_interrupt(cs);
qemu_mutex_unlock_iothread();
return false;
}
#define ARM64_REG_ESR_EL1 ARM64_SYS_REG(3, 0, 5, 2, 0)
#define ARM64_REG_TCR_EL1 ARM64_SYS_REG(3, 0, 2, 0, 2)
/*
* ESR_EL1
* ISS encoding
* AARCH64: DFSC, bits [5:0]
* AARCH32:
* TTBCR.EAE == 0
* FS[4] - DFSR[10]
* FS[3:0] - DFSR[3:0]
* TTBCR.EAE == 1
* FS, bits [5:0]
*/
#define ESR_DFSC(aarch64, lpae, v) \
((aarch64 || (lpae)) ? ((v) & 0x3F) \
: (((v) >> 6) | ((v) & 0x1F)))
#define ESR_DFSC_EXTABT(aarch64, lpae) \
((aarch64) ? 0x10 : (lpae) ? 0x10 : 0x8)
bool kvm_arm_verify_ext_dabt_pending(CPUState *cs)
{
uint64_t dfsr_val;
if (!kvm_get_one_reg(cs, ARM64_REG_ESR_EL1, &dfsr_val)) {
ARMCPU *cpu = ARM_CPU(cs);
CPUARMState *env = &cpu->env;
int aarch64_mode = arm_feature(env, ARM_FEATURE_AARCH64);
int lpae = 0;
if (!aarch64_mode) {
uint64_t ttbcr;
if (!kvm_get_one_reg(cs, ARM64_REG_TCR_EL1, &ttbcr)) {
lpae = arm_feature(env, ARM_FEATURE_LPAE)
&& (ttbcr & TTBCR_EAE);
}
}
/*
* The verification here is based on the DFSC bits
* of the ESR_EL1 reg only
*/
return (ESR_DFSC(aarch64_mode, lpae, dfsr_val) ==
ESR_DFSC_EXTABT(aarch64_mode, lpae));
}
return false;
}
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