[PATCH v2 0/5] target/arm: Some CONFIG_TCG code movement

[PATCH v2 0/5] target/arm: Some CONFIG_TCG code movement

[Fabiano Rosas]

since v1:
- patch 1: dropped. I will include it in the next series;

- patch 3: tcg_handle_semihosting does not need tcg_enabled, only
  CONFIG_TCG;

- patch 4 (new): moved alignment check and updated comment.

v1:
https://lore.kernel.org/r/20221216212944.28229-1-farosas@suse.de

Hi,

This is the second round of rebasing the patches from:
https://lore.kernel.org/r/20210416162824.25131-1-cfontana@suse.de

These are the simpler ones that move code under
CONFIG_TCG/tcg_enabled. No new directories or files.

Claudio Fontana (4):
  target/arm: rename handle_semihosting to tcg_handle_semihosting
  target/arm: wrap psci call with tcg_enabled
  target/arm: wrap call to aarch64_sve_change_el in tcg_enabled()
  target/arm: only perform TCG cpu and machine inits if TCG enabled

Fabiano Rosas (1):
  target/arm: Move PC alignment check

 target/arm/cpu.c     | 31 ++++++++++++++----------
 target/arm/helper.c  | 19 ++++++++-------
 target/arm/kvm.c     | 18 +++++++-------
 target/arm/kvm_arm.h |  3 +--
 target/arm/machine.c | 57 +++++++++++++++++++++++++-------------------
 5 files changed, 71 insertions(+), 57 deletions(-)

-- 
2.35.3

[PATCH v2 1/5] target/arm: rename handle_semihosting to tcg_handle_semihosting

[Fabiano Rosas]

From: Claudio Fontana <cfontana@suse.de>

make it clearer from the name that this is a tcg-only function.

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
This function moves elsewhere in the original series, but the name
change doesn't need to wait.

Originally from:
[RFC v14 38/80] target/arm: rename handle_semihosting to tcg_handle_semihosting
https://lore.kernel.org/r/20210416162824.25131-39-cfontana@suse.de
---
 target/arm/helper.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/arm/helper.c b/target/arm/helper.c
index bac2ea62c4..fa741d5175 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -10293,7 +10293,7 @@ static void arm_cpu_do_interrupt_aarch64(CPUState *cs)
  * trapped to the hypervisor in KVM.
  */
 #ifdef CONFIG_TCG
-static void handle_semihosting(CPUState *cs)
+static void tcg_handle_semihosting(CPUState *cs)
 {
     ARMCPU *cpu = ARM_CPU(cs);
     CPUARMState *env = &cpu->env;
@@ -10354,7 +10354,7 @@ void arm_cpu_do_interrupt(CPUState *cs)
      */
 #ifdef CONFIG_TCG
     if (cs->exception_index == EXCP_SEMIHOST) {
-        handle_semihosting(cs);
+        tcg_handle_semihosting(cs);
         return;
     }
 #endif
-- 
2.35.3

[PATCH v2 2/5] target/arm: wrap psci call with tcg_enabled

[Fabiano Rosas]

From: Claudio Fontana <cfontana@suse.de>

for "all" builds (tcg + kvm), we want to avoid doing
the psci check if tcg is built-in, but not enabled.

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
Originally from:
[RFC v14 39/80] target/arm: replace CONFIG_TCG with tcg_enabled
https://lore.kernel.org/r/20210416162824.25131-40-cfontana@suse.de
---
 target/arm/helper.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/target/arm/helper.c b/target/arm/helper.c
index fa741d5175..193e0ef8fb 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -26,6 +26,7 @@
 #include "sysemu/cpus.h"
 #include "sysemu/cpu-timers.h"
 #include "sysemu/kvm.h"
+#include "sysemu/tcg.h"
 #include "qemu/range.h"
 #include "qapi/qapi-commands-machine-target.h"
 #include "qapi/error.h"
@@ -10341,7 +10342,7 @@ void arm_cpu_do_interrupt(CPUState *cs)
                       env->exception.syndrome);
     }
 
-    if (arm_is_psci_call(cpu, cs->exception_index)) {
+    if (tcg_enabled() && arm_is_psci_call(cpu, cs->exception_index)) {
         arm_handle_psci_call(cpu);
         qemu_log_mask(CPU_LOG_INT, "...handled as PSCI call\n");
         return;
-- 
2.35.3

[PATCH v2 3/5] target/arm: wrap call to aarch64_sve_change_el in tcg_enabled()

[Fabiano Rosas]

From: Claudio Fontana <cfontana@suse.de>

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
---
Originally from:
[RFC v14 42/80] target/arm: wrap call to aarch64_sve_change_el in tcg_enabled()
https://lore.kernel.org/r/20210416162824.25131-43-cfontana@suse.de
---
 target/arm/helper.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/target/arm/helper.c b/target/arm/helper.c
index 193e0ef8fb..f33687e98d 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -10107,11 +10107,13 @@ static void arm_cpu_do_interrupt_aarch64(CPUState *cs)
     unsigned int cur_el = arm_current_el(env);
     int rt;
 
-    /*
-     * Note that new_el can never be 0.  If cur_el is 0, then
-     * el0_a64 is is_a64(), else el0_a64 is ignored.
-     */
-    aarch64_sve_change_el(env, cur_el, new_el, is_a64(env));
+    if (tcg_enabled()) {
+        /*
+         * Note that new_el can never be 0.  If cur_el is 0, then
+         * el0_a64 is is_a64(), else el0_a64 is ignored.
+         */
+        aarch64_sve_change_el(env, cur_el, new_el, is_a64(env));
+    }
 
     if (cur_el < new_el) {
         /* Entry vector offset depends on whether the implemented EL
-- 
2.35.3

[PATCH v2 4/5] target/arm: Move PC alignment check

[Fabiano Rosas]

Move this earlier to make the next patch diff cleaner. While here
update the comment slightly to not give the impression that the
misalignment affects only TCG.

Signed-off-by: Fabiano Rosas <farosas@suse.de>
---
 target/arm/machine.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/target/arm/machine.c b/target/arm/machine.c
index 54c5c62433..a186787d2b 100644
--- a/target/arm/machine.c
+++ b/target/arm/machine.c
@@ -811,6 +811,15 @@ static int cpu_post_load(void *opaque, int version_id)
         }
     }
 
+    /*
+     * Misaligned thumb pc is architecturally impossible. Fail the
+     * incoming migration. For TCG it would trigger the assert in
+     * thumb_tr_translate_insn().
+     */
+    if (!is_a64(env) && env->thumb && (env->regs[15] & 1)) {
+        return -1;
+    }
+
     hw_breakpoint_update_all(cpu);
     hw_watchpoint_update_all(cpu);
 
@@ -828,15 +837,6 @@ static int cpu_post_load(void *opaque, int version_id)
         }
     }
 
-    /*
-     * Misaligned thumb pc is architecturally impossible.
-     * We have an assert in thumb_tr_translate_insn to verify this.
-     * Fail an incoming migrate to avoid this assert.
-     */
-    if (!is_a64(env) && env->thumb && (env->regs[15] & 1)) {
-        return -1;
-    }
-
     if (!kvm_enabled()) {
         pmu_op_finish(&cpu->env);
     }
-- 
2.35.3

[PATCH v2 5/5] target/arm: only perform TCG cpu and machine inits if TCG enabled

[Fabiano Rosas]

From: Claudio Fontana <cfontana@suse.de>

of note, cpreg lists were previously initialized by TCG first,
and then thrown away and replaced with the data coming from KVM.

Now we just initialize once, either for TCG or for KVM.

Signed-off-by: Claudio Fontana <cfontana@suse.de>
[moved arm_cpu_register_gdb_regs_for_features out of tcg_enabled]
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
Originally from:
[RFC v14 16/80] target/arm: only perform TCG cpu and machine inits if
TCG enabled
https://lore.kernel.org/r/20210416162824.25131-17-cfontana@suse.de
---
 target/arm/cpu.c     | 31 +++++++++++++++++-------------
 target/arm/kvm.c     | 18 +++++++++---------
 target/arm/kvm_arm.h |  3 +--
 target/arm/machine.c | 45 +++++++++++++++++++++++++-------------------
 4 files changed, 54 insertions(+), 43 deletions(-)

diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 2fa022f62b..fdf30e7268 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -525,9 +525,11 @@ static void arm_cpu_reset_hold(Object *obj)
     }
 #endif
 
-    hw_breakpoint_update_all(cpu);
-    hw_watchpoint_update_all(cpu);
-    arm_rebuild_hflags(env);
+    if (tcg_enabled()) {
+        hw_breakpoint_update_all(cpu);
+        hw_watchpoint_update_all(cpu);
+        arm_rebuild_hflags(env);
+    }
 }
 
 #if defined(CONFIG_TCG) && !defined(CONFIG_USER_ONLY)
@@ -1600,6 +1602,7 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
         }
     }
 
+#ifdef CONFIG_TCG
     {
         uint64_t scale;
 
@@ -1625,7 +1628,8 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
         cpu->gt_timer[GTIMER_HYPVIRT] = timer_new(QEMU_CLOCK_VIRTUAL, scale,
                                                   arm_gt_hvtimer_cb, cpu);
     }
-#endif
+#endif /* CONFIG_TCG */
+#endif /* !CONFIG_USER_ONLY */
 
     cpu_exec_realizefn(cs, &local_err);
     if (local_err != NULL) {
@@ -1943,17 +1947,16 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
         unset_feature(env, ARM_FEATURE_PMU);
     }
     if (arm_feature(env, ARM_FEATURE_PMU)) {
-        pmu_init(cpu);
-
-        if (!kvm_enabled()) {
+        if (tcg_enabled()) {
+            pmu_init(cpu);
             arm_register_pre_el_change_hook(cpu, &pmu_pre_el_change, 0);
             arm_register_el_change_hook(cpu, &pmu_post_el_change, 0);
-        }
 
 #ifndef CONFIG_USER_ONLY
-        cpu->pmu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, arm_pmu_timer_cb,
-                cpu);
+            cpu->pmu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, arm_pmu_timer_cb,
+                                          cpu);
 #endif
+        }
     } else {
         cpu->isar.id_aa64dfr0 =
             FIELD_DP64(cpu->isar.id_aa64dfr0, ID_AA64DFR0, PMUVER, 0);
@@ -2049,10 +2052,12 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
         set_feature(env, ARM_FEATURE_VBAR);
     }
 
-    register_cp_regs_for_features(cpu);
-    arm_cpu_register_gdb_regs_for_features(cpu);
+    if (tcg_enabled()) {
+        register_cp_regs_for_features(cpu);
+        init_cpreg_list(cpu);
+    }
 
-    init_cpreg_list(cpu);
+    arm_cpu_register_gdb_regs_for_features(cpu);
 
 #ifndef CONFIG_USER_ONLY
     MachineState *ms = MACHINE(qdev_get_machine());
diff --git a/target/arm/kvm.c b/target/arm/kvm.c
index f022c644d2..2f01c26f54 100644
--- a/target/arm/kvm.c
+++ b/target/arm/kvm.c
@@ -438,9 +438,11 @@ static uint64_t *kvm_arm_get_cpreg_ptr(ARMCPU *cpu, uint64_t regidx)
     return &cpu->cpreg_values[res - cpu->cpreg_indexes];
 }
 
-/* Initialize the ARMCPU cpreg list according to the kernel's
- * definition of what CPU registers it knows about (and throw away
- * the previous TCG-created cpreg list).
+/*
+ * Initialize the ARMCPU cpreg list according to the kernel's
+ * definition of what CPU registers it knows about.
+ *
+ * The parallel for TCG is init_cpreg_list()
  */
 int kvm_arm_init_cpreg_list(ARMCPU *cpu)
 {
@@ -482,12 +484,10 @@ int kvm_arm_init_cpreg_list(ARMCPU *cpu)
         arraylen++;
     }
 
-    cpu->cpreg_indexes = g_renew(uint64_t, cpu->cpreg_indexes, arraylen);
-    cpu->cpreg_values = g_renew(uint64_t, cpu->cpreg_values, arraylen);
-    cpu->cpreg_vmstate_indexes = g_renew(uint64_t, cpu->cpreg_vmstate_indexes,
-                                         arraylen);
-    cpu->cpreg_vmstate_values = g_renew(uint64_t, cpu->cpreg_vmstate_values,
-                                        arraylen);
+    cpu->cpreg_indexes = g_new(uint64_t, arraylen);
+    cpu->cpreg_values = g_new(uint64_t, arraylen);
+    cpu->cpreg_vmstate_indexes = g_new(uint64_t, arraylen);
+    cpu->cpreg_vmstate_values = g_new(uint64_t, arraylen);
     cpu->cpreg_array_len = arraylen;
     cpu->cpreg_vmstate_array_len = arraylen;
 
diff --git a/target/arm/kvm_arm.h b/target/arm/kvm_arm.h
index 99017b635c..41de2a7cf1 100644
--- a/target/arm/kvm_arm.h
+++ b/target/arm/kvm_arm.h
@@ -70,8 +70,7 @@ void kvm_arm_register_device(MemoryRegion *mr, uint64_t devid, uint64_t group,
  * @cpu: ARMCPU
  *
  * Initialize the ARMCPU cpreg list according to the kernel's
- * definition of what CPU registers it knows about (and throw away
- * the previous TCG-created cpreg list).
+ * definition of what CPU registers it knows about.
  *
  * Returns: 0 if success, else < 0 error code
  */
diff --git a/target/arm/machine.c b/target/arm/machine.c
index a186787d2b..5ac1e6173a 100644
--- a/target/arm/machine.c
+++ b/target/arm/machine.c
@@ -2,6 +2,7 @@
 #include "cpu.h"
 #include "qemu/error-report.h"
 #include "sysemu/kvm.h"
+#include "sysemu/tcg.h"
 #include "kvm_arm.h"
 #include "internals.h"
 #include "migration/cpu.h"
@@ -687,7 +688,7 @@ static int cpu_pre_save(void *opaque)
 {
     ARMCPU *cpu = opaque;
 
-    if (!kvm_enabled()) {
+    if (tcg_enabled()) {
         pmu_op_start(&cpu->env);
     }
 
@@ -722,7 +723,7 @@ static int cpu_post_save(void *opaque)
 {
     ARMCPU *cpu = opaque;
 
-    if (!kvm_enabled()) {
+    if (tcg_enabled()) {
         pmu_op_finish(&cpu->env);
     }
 
@@ -741,7 +742,7 @@ static int cpu_pre_load(void *opaque)
      */
     env->irq_line_state = UINT32_MAX;
 
-    if (!kvm_enabled()) {
+    if (tcg_enabled()) {
         pmu_op_start(&cpu->env);
     }
 
@@ -820,27 +821,28 @@ static int cpu_post_load(void *opaque, int version_id)
         return -1;
     }
 
-    hw_breakpoint_update_all(cpu);
-    hw_watchpoint_update_all(cpu);
+    if (tcg_enabled()) {
+        hw_breakpoint_update_all(cpu);
+        hw_watchpoint_update_all(cpu);
 
-    /*
-     * TCG gen_update_fp_context() relies on the invariant that
-     * FPDSCR.LTPSIZE is constant 4 for M-profile with the LOB extension;
-     * forbid bogus incoming data with some other value.
-     */
-    if (arm_feature(env, ARM_FEATURE_M) && cpu_isar_feature(aa32_lob, cpu)) {
-        if (extract32(env->v7m.fpdscr[M_REG_NS],
-                      FPCR_LTPSIZE_SHIFT, FPCR_LTPSIZE_LENGTH) != 4 ||
-            extract32(env->v7m.fpdscr[M_REG_S],
-                      FPCR_LTPSIZE_SHIFT, FPCR_LTPSIZE_LENGTH) != 4) {
-            return -1;
+        /*
+         * TCG gen_update_fp_context() relies on the invariant that
+         * FPDSCR.LTPSIZE is constant 4 for M-profile with the LOB extension;
+         * forbid bogus incoming data with some other value.
+         */
+        if (arm_feature(env, ARM_FEATURE_M) &&
+            cpu_isar_feature(aa32_lob, cpu)) {
+            if (extract32(env->v7m.fpdscr[M_REG_NS],
+                          FPCR_LTPSIZE_SHIFT, FPCR_LTPSIZE_LENGTH) != 4 ||
+                extract32(env->v7m.fpdscr[M_REG_S],
+                          FPCR_LTPSIZE_SHIFT, FPCR_LTPSIZE_LENGTH) != 4) {
+                return -1;
+            }
         }
-    }
 
-    if (!kvm_enabled()) {
         pmu_op_finish(&cpu->env);
+        arm_rebuild_hflags(&cpu->env);
     }
-    arm_rebuild_hflags(&cpu->env);
 
     return 0;
 }
@@ -890,8 +892,13 @@ const VMStateDescription vmstate_arm_cpu = {
         VMSTATE_UINT32(env.exception.syndrome, ARMCPU),
         VMSTATE_UINT32(env.exception.fsr, ARMCPU),
         VMSTATE_UINT64(env.exception.vaddress, ARMCPU),
+#ifdef CONFIG_TCG
         VMSTATE_TIMER_PTR(gt_timer[GTIMER_PHYS], ARMCPU),
         VMSTATE_TIMER_PTR(gt_timer[GTIMER_VIRT], ARMCPU),
+#else
+        VMSTATE_UNUSED(sizeof(QEMUTimer *)),
+        VMSTATE_UNUSED(sizeof(QEMUTimer *)),
+#endif /* CONFIG_TCG */
         {
             .name = "power_state",
             .version_id = 0,
-- 
2.35.3

Re: [PATCH v2 4/5] target/arm: Move PC alignment check

[Richard Henderson]

On 12/20/22 14:04, Fabiano Rosas wrote:
> Move this earlier to make the next patch diff cleaner. While here
> update the comment slightly to not give the impression that the
> misalignment affects only TCG.
> 
> Signed-off-by: Fabiano Rosas<farosas@suse.de>
> ---
>   target/arm/machine.c | 18 +++++++++---------
>   1 file changed, 9 insertions(+), 9 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH v2 5/5] target/arm: only perform TCG cpu and machine inits if TCG enabled

[Richard Henderson]

On 12/20/22 14:04, Fabiano Rosas wrote:
> From: Claudio Fontana<cfontana@suse.de>
> 
> of note, cpreg lists were previously initialized by TCG first,
> and then thrown away and replaced with the data coming from KVM.
> 
> Now we just initialize once, either for TCG or for KVM.
> 
> Signed-off-by: Claudio Fontana<cfontana@suse.de>
> [moved arm_cpu_register_gdb_regs_for_features out of tcg_enabled]
> Signed-off-by: Fabiano Rosas<farosas@suse.de>
> Reviewed-by: Richard Henderson<richard.henderson@linaro.org>
> ---
> Originally from:
> [RFC v14 16/80] target/arm: only perform TCG cpu and machine inits if
> TCG enabled
> https://lore.kernel.org/r/20210416162824.25131-17-cfontana@suse.de
> ---
>   target/arm/cpu.c     | 31 +++++++++++++++++-------------
>   target/arm/kvm.c     | 18 +++++++++---------
>   target/arm/kvm_arm.h |  3 +--
>   target/arm/machine.c | 45 +++++++++++++++++++++++++-------------------
>   4 files changed, 54 insertions(+), 43 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

Re: [PATCH v2 0/5] target/arm: Some CONFIG_TCG code movement

[Fabiano Rosas]

Fabiano Rosas <farosas@suse.de> writes:

> since v1:
> - patch 1: dropped. I will include it in the next series;
>
> - patch 3: tcg_handle_semihosting does not need tcg_enabled, only
>   CONFIG_TCG;
>
> - patch 4 (new): moved alignment check and updated comment.
>
> v1:
> https://lore.kernel.org/r/20221216212944.28229-1-farosas@suse.de
>
> Hi,
>
> This is the second round of rebasing the patches from:
> https://lore.kernel.org/r/20210416162824.25131-1-cfontana@suse.de
>
> These are the simpler ones that move code under
> CONFIG_TCG/tcg_enabled. No new directories or files.
>
> Claudio Fontana (4):
>   target/arm: rename handle_semihosting to tcg_handle_semihosting
>   target/arm: wrap psci call with tcg_enabled
>   target/arm: wrap call to aarch64_sve_change_el in tcg_enabled()
>   target/arm: only perform TCG cpu and machine inits if TCG enabled

Peter,

let's drop this series please. I need to double check patch 5.

I'll resend it later on all along with the v2 of my latest RFC:

  [RFC PATCH 00/27] target/arm: Allow CONFIG_TCG=n builds
  https://lore.kernel.org/r/20230104215835.24692-1-farosas@suse.de