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xemu/target-arm/kvm64.c
Peter Maydell f8c88bbcda target-arm: Raw CPSR writes should skip checks and bank switching 
Raw CPSR writes should skip the architectural checks for whether
we're allowed to set the A or F bits and should also not do
the switching of register banks if the mode changes. Handle
this inside cpsr_write(), which allows us to drop the "manually
set the mode bits to avoid the bank switch" code from all the
callsites which are using CPSRWriteRaw.

This fixes a bug in 32-bit KVM handling where we had forgotten
the "manually set the mode bits" part and could thus potentially
trash the register state if the mode from the last exit to userspace
differed from the mode on this exit.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Sergey Fedorov <serge.fdrv@gmail.com>
Message-id: 1455556977-3644-4-git-send-email-peter.maydell@linaro.org
2016-02-26 15:09:41 +00:00

927 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/mman.h>
#include <sys/ptrace.h>
#include <linux/elf.h>
#include <linux/kvm.h>
#include "qemu-common.h"
#include "qemu/timer.h"
#include "qemu/error-report.h"
#include "qemu/host-utils.h"
#include "exec/gdbstub.h"
#include "sysemu/sysemu.h"
#include "sysemu/kvm.h"
#include "kvm_arm.h"
#include "cpu.h"
#include "internals.h"
#include "hw/arm/arm.h"
static bool have_guest_debug;
/*
* Although the ARM implementation of hardware assisted debugging
* allows for different breakpoints per-core, the current GDB
* interface treats them as a global pool of registers (which seems to
* be the case for x86, ppc and s390). As a result we store one copy
* of registers which is used for all active cores.
*
* Write access is serialised by virtue of the GDB protocol which
* updates things. Read access (i.e. when the values are copied to the
* vCPU) is also gated by GDB's run control.
*
* This is not unreasonable as most of the time debugging kernels you
* never know which core will eventually execute your function.
*/
typedef struct {
uint64_t bcr;
uint64_t bvr;
} HWBreakpoint;
/* The watchpoint registers can cover more area than the requested
* watchpoint so we need to store the additional information
* somewhere. We also need to supply a CPUWatchpoint to the GDB stub
* when the watchpoint is hit.
*/
typedef struct {
uint64_t wcr;
uint64_t wvr;
CPUWatchpoint details;
} HWWatchpoint;
/* Maximum and current break/watch point counts */
int max_hw_bps, max_hw_wps;
GArray *hw_breakpoints, *hw_watchpoints;
#define cur_hw_wps (hw_watchpoints->len)
#define cur_hw_bps (hw_breakpoints->len)
#define get_hw_bp(i) (&g_array_index(hw_breakpoints, HWBreakpoint, i))
#define get_hw_wp(i) (&g_array_index(hw_watchpoints, HWWatchpoint, i))
/**
* kvm_arm_init_debug() - check for guest debug capabilities
* @cs: CPUState
*
* kvm_check_extension returns the number of debug registers we have
* or 0 if we have none.
*
*/
static void kvm_arm_init_debug(CPUState *cs)
{
have_guest_debug = kvm_check_extension(cs->kvm_state,
KVM_CAP_SET_GUEST_DEBUG);
max_hw_wps = kvm_check_extension(cs->kvm_state, 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(cs->kvm_state, KVM_CAP_GUEST_DEBUG_HW_BPS);
hw_breakpoints = g_array_sized_new(true, true,
sizeof(HWBreakpoint), max_hw_bps);
return;
}
/**
* insert_hw_breakpoint()
* @addr: address of breakpoint
*
* See ARM ARM D2.9.1 for details but here we are only going to create
* simple un-linked breakpoints (i.e. we don't chain breakpoints
* together to match address and context or vmid). The hardware is
* capable of fancier matching but that will require exposing that
* fanciness to GDB's interface
*
* D7.3.2 DBGBCR<n>_EL1, Debug Breakpoint Control Registers
*
* 31 24 23 20 19 16 15 14 13 12 9 8 5 4 3 2 1 0
* +------+------+-------+-----+----+------+-----+------+-----+---+
* | RES0 | BT | LBN | SSC | HMC| RES0 | BAS | RES0 | PMC | E |
* +------+------+-------+-----+----+------+-----+------+-----+---+
*
* BT: Breakpoint type (0 = unlinked address match)
* LBN: Linked BP number (0 = unused)
* SSC/HMC/PMC: Security, Higher and Priv access control (Table D-12)
* BAS: Byte Address Select (RES1 for AArch64)
* E: Enable bit
*/
static int insert_hw_breakpoint(target_ulong addr)
{
HWBreakpoint brk = {
.bcr = 0x1, /* BCR E=1, enable */
.bvr = addr
};
if (cur_hw_bps >= max_hw_bps) {
return -ENOBUFS;
}
brk.bcr = deposit32(brk.bcr, 1, 2, 0x3); /* PMC = 11 */
brk.bcr = deposit32(brk.bcr, 5, 4, 0xf); /* BAS = RES1 */
g_array_append_val(hw_breakpoints, brk);
return 0;
}
/**
* delete_hw_breakpoint()
* @pc: address of breakpoint
*
* Delete a breakpoint and shuffle any above down
*/
static int delete_hw_breakpoint(target_ulong pc)
{
int i;
for (i = 0; i < hw_breakpoints->len; i++) {
HWBreakpoint *brk = get_hw_bp(i);
if (brk->bvr == pc) {
g_array_remove_index(hw_breakpoints, i);
return 0;
}
}
return -ENOENT;
}
/**
* insert_hw_watchpoint()
* @addr: address of watch point
* @len: size of area
* @type: type of watch point
*
* See ARM ARM D2.10. As with the breakpoints we can do some advanced
* stuff if we want to. The watch points can be linked with the break
* points above to make them context aware. However for simplicity
* currently we only deal with simple read/write watch points.
*
* D7.3.11 DBGWCR<n>_EL1, Debug Watchpoint Control Registers
*
* 31 29 28 24 23 21 20 19 16 15 14 13 12 5 4 3 2 1 0
* +------+-------+------+----+-----+-----+-----+-----+-----+-----+---+
* | RES0 | MASK | RES0 | WT | LBN | SSC | HMC | BAS | LSC | PAC | E |
* +------+-------+------+----+-----+-----+-----+-----+-----+-----+---+
*
* MASK: num bits addr mask (0=none,01/10=res,11=3 bits (8 bytes))
* WT: 0 - unlinked, 1 - linked (not currently used)
* LBN: Linked BP number (not currently used)
* SSC/HMC/PAC: Security, Higher and Priv access control (Table D2-11)
* BAS: Byte Address Select
* LSC: Load/Store control (01: load, 10: store, 11: both)
* E: Enable
*
* The bottom 2 bits of the value register are masked. Therefore to
* break on any sizes smaller than an unaligned word you need to set
* MASK=0, BAS=bit per byte in question. For larger regions (^2) you
* need to ensure you mask the address as required and set BAS=0xff
*/
static int insert_hw_watchpoint(target_ulong addr,
target_ulong len, int type)
{
HWWatchpoint wp = {
.wcr = 1, /* E=1, enable */
.wvr = addr & (~0x7ULL),
.details = { .vaddr = addr, .len = len }
};
if (cur_hw_wps >= max_hw_wps) {
return -ENOBUFS;
}
/*
* HMC=0 SSC=0 PAC=3 will hit EL0 or EL1, any security state,
* valid whether EL3 is implemented or not
*/
wp.wcr = deposit32(wp.wcr, 1, 2, 3);
switch (type) {
case GDB_WATCHPOINT_READ:
wp.wcr = deposit32(wp.wcr, 3, 2, 1);
wp.details.flags = BP_MEM_READ;
break;
case GDB_WATCHPOINT_WRITE:
wp.wcr = deposit32(wp.wcr, 3, 2, 2);
wp.details.flags = BP_MEM_WRITE;
break;
case GDB_WATCHPOINT_ACCESS:
wp.wcr = deposit32(wp.wcr, 3, 2, 3);
wp.details.flags = BP_MEM_ACCESS;
break;
default:
g_assert_not_reached();
break;
}
if (len <= 8) {
/* we align the address and set the bits in BAS */
int off = addr & 0x7;
int bas = (1 << len) - 1;
wp.wcr = deposit32(wp.wcr, 5 + off, 8 - off, bas);
} else {
/* For ranges above 8 bytes we need to be a power of 2 */
if (is_power_of_2(len)) {
int bits = ctz64(len);
wp.wvr &= ~((1 << bits) - 1);
wp.wcr = deposit32(wp.wcr, 24, 4, bits);
wp.wcr = deposit32(wp.wcr, 5, 8, 0xff);
} else {
return -ENOBUFS;
}
}
g_array_append_val(hw_watchpoints, wp);
return 0;
}
static bool check_watchpoint_in_range(int i, target_ulong addr)
{
HWWatchpoint *wp = get_hw_wp(i);
uint64_t addr_top, addr_bottom = wp->wvr;
int bas = extract32(wp->wcr, 5, 8);
int mask = extract32(wp->wcr, 24, 4);
if (mask) {
addr_top = addr_bottom + (1 << mask);
} else {
/* BAS must be contiguous but can offset against the base
* address in DBGWVR */
addr_bottom = addr_bottom + ctz32(bas);
addr_top = addr_bottom + clo32(bas);
}
if (addr >= addr_bottom && addr <= addr_top) {
return true;
}
return false;
}
/**
* delete_hw_watchpoint()
* @addr: address of breakpoint
*
* Delete a breakpoint and shuffle any above down
*/
static int delete_hw_watchpoint(target_ulong addr,
target_ulong len, int type)
{
int i;
for (i = 0; i < cur_hw_wps; i++) {
if (check_watchpoint_in_range(i, addr)) {
g_array_remove_index(hw_watchpoints, i);
return 0;
}
}
return -ENOENT;
}
int kvm_arch_insert_hw_breakpoint(target_ulong addr,
target_ulong 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(target_ulong addr,
target_ulong len, int type)
{
switch (type) {
case GDB_BREAKPOINT_HW:
return delete_hw_breakpoint(addr);
break;
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 find_hw_breakpoint(CPUState *cpu, target_ulong pc)
{
int i;
for (i = 0; i < cur_hw_bps; i++) {
HWBreakpoint *bp = get_hw_bp(i);
if (bp->bvr == pc) {
return true;
}
}
return false;
}
static CPUWatchpoint *find_hw_watchpoint(CPUState *cpu, target_ulong addr)
{
int i;
for (i = 0; i < cur_hw_wps; i++) {
if (check_watchpoint_in_range(i, addr)) {
return &get_hw_wp(i)->details;
}
}
return NULL;
}
static inline void set_feature(uint64_t *features, int feature)
{
*features |= 1ULL << feature;
}
bool kvm_arm_get_host_cpu_features(ARMHostCPUClass *ahcc)
{
/* 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.
* For AArch64 we currently don't care about ID registers at
* all; we just want to know the CPU type.
*/
int fdarray[3];
uint64_t features = 0;
/* 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
};
struct kvm_vcpu_init init;
if (!kvm_arm_create_scratch_host_vcpu(cpus_to_try, fdarray, &init)) {
return false;
}
ahcc->target = init.target;
ahcc->dtb_compatible = "arm,arm-v8";
kvm_arm_destroy_scratch_host_vcpu(fdarray);
/* 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.
*/
set_feature(&features, ARM_FEATURE_V8);
set_feature(&features, ARM_FEATURE_VFP4);
set_feature(&features, ARM_FEATURE_NEON);
set_feature(&features, ARM_FEATURE_AARCH64);
ahcc->features = features;
return true;
}
#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);
if (cpu->kvm_target == QEMU_KVM_ARM_TARGET_NONE ||
!object_dynamic_cast(OBJECT(cpu), TYPE_AARCH64_CPU)) {
fprintf(stderr, "KVM is not supported for this guest CPU type\n");
return -EINVAL;
}
/* Determine init features for this CPU */
memset(cpu->kvm_init_features, 0, sizeof(cpu->kvm_init_features));
if (cpu->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 = 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;
}
/* Do KVM_ARM_VCPU_INIT ioctl */
ret = kvm_arm_vcpu_init(cs);
if (ret) {
return ret;
}
/*
* 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;
kvm_arm_init_debug(cs);
return kvm_arm_init_cpreg_list(cpu);
}
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 reg we sync by
* hand in kvm_arch_get/put_registers())
*/
switch (regidx & KVM_REG_ARM_COPROC_MASK) {
case KVM_REG_ARM_CORE:
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 },
};
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;
}
#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))
int kvm_arch_put_registers(CPUState *cs, int level)
{
struct kvm_one_reg reg;
uint32_t fpr;
uint64_t val;
int i;
int 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;
}
}
/* Advanced SIMD and FP registers
* We map Qn = regs[2n+1]:regs[2n]
*/
for (i = 0; i < 32; i++) {
int rd = i << 1;
uint64_t fp_val[2];
#ifdef HOST_WORDS_BIGENDIAN
fp_val[0] = env->vfp.regs[rd + 1];
fp_val[1] = env->vfp.regs[rd];
#else
fp_val[1] = env->vfp.regs[rd + 1];
fp_val[0] = env->vfp.regs[rd];
#endif
reg.id = AARCH64_SIMD_CORE_REG(fp_regs.vregs[i]);
reg.addr = (uintptr_t)(&fp_val);
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
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;
}
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;
}
if (!write_list_to_kvmstate(cpu, level)) {
return EINVAL;
}
kvm_arm_sync_mpstate_to_kvm(cpu);
return ret;
}
int kvm_arch_get_registers(CPUState *cs)
{
struct kvm_one_reg reg;
uint64_t val;
uint32_t fpr;
unsigned int el;
int i;
int 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];
}
/* Advanced SIMD and FP registers
* We map Qn = regs[2n+1]:regs[2n]
*/
for (i = 0; i < 32; i++) {
uint64_t fp_val[2];
reg.id = AARCH64_SIMD_CORE_REG(fp_regs.vregs[i]);
reg.addr = (uintptr_t)(&fp_val);
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
if (ret) {
return ret;
} else {
int rd = i << 1;
#ifdef HOST_WORDS_BIGENDIAN
env->vfp.regs[rd + 1] = fp_val[0];
env->vfp.regs[rd] = fp_val[1];
#else
env->vfp.regs[rd + 1] = fp_val[1];
env->vfp.regs[rd] = fp_val[0];
#endif
}
}
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.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);
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;
}
/* 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 = debug_exit->hsr >> ARM_EL_EC_SHIFT;
ARMCPU *cpu = ARM_CPU(cs);
CPUClass *cc = CPU_GET_CLASS(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")\n",
__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")\n",
__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;
cc->do_interrupt(cs);
return false;
}
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