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Re: [PATCH v2 16/18] kvm: convert "-machine kvm_shadow_mem" to an accele


From: Philippe Mathieu-Daudé
Subject: Re: [PATCH v2 16/18] kvm: convert "-machine kvm_shadow_mem" to an accelerator property
Date: Tue, 10 Dec 2019 13:01:17 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2

On 12/9/19 4:01 PM, Paolo Bonzini wrote:
Signed-off-by: Paolo Bonzini <address@hidden>
---
  accel/kvm/kvm-all.c | 43 +++++++++++++++++++++++++++++++++++++++++++
  hw/core/machine.c   | 39 ---------------------------------------
  include/hw/boards.h |  2 --
  qemu-options.hx     |  6 +++---
  target/i386/kvm.c   |  2 +-
  vl.c                |  4 ++++
  6 files changed, 51 insertions(+), 45 deletions(-)

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index ca00daa..f0b9294 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -41,6 +41,7 @@
  #include "hw/irq.h"
  #include "sysemu/sev.h"
  #include "sysemu/balloon.h"
+#include "qapi/visitor.h"
#include "hw/boards.h" @@ -92,6 +93,7 @@ struct KVMState
      int max_nested_state_len;
      int many_ioeventfds;
      int intx_set_mask;
+    int kvm_shadow_mem;
      bool sync_mmu;
      bool manual_dirty_log_protect;
      /* The man page (and posix) say ioctl numbers are signed int, but
@@ -2940,6 +2942,40 @@ static bool kvm_accel_has_memory(MachineState *ms, 
AddressSpace *as,
      return false;
  }
+static void kvm_get_kvm_shadow_mem(Object *obj, Visitor *v,
+                                   const char *name, void *opaque,
+                                   Error **errp)
+{
+    KVMState *s = KVM_STATE(obj);
+    int64_t value = s->kvm_shadow_mem;
+
+    visit_type_int(v, name, &value, errp);
+}
+
+static void kvm_set_kvm_shadow_mem(Object *obj, Visitor *v,
+                                   const char *name, void *opaque,
+                                   Error **errp)
+{
+    KVMState *s = KVM_STATE(obj);
+    Error *error = NULL;
+    int64_t value;
+
+    visit_type_int(v, name, &value, &error);
+    if (error) {
+        error_propagate(errp, error);
+        return;
+    }
+
+    s->kvm_shadow_mem = value;
+}
+
+static void kvm_accel_instance_init(Object *obj)
+{
+    KVMState *s = KVM_STATE(obj);
+
+    s->kvm_shadow_mem = -1;
+}
+
  static void kvm_accel_class_init(ObjectClass *oc, void *data)
  {
      AccelClass *ac = ACCEL_CLASS(oc);
@@ -2947,11 +2983,18 @@ static void kvm_accel_class_init(ObjectClass *oc, void 
*data)
      ac->init_machine = kvm_init;
      ac->has_memory = kvm_accel_has_memory;
      ac->allowed = &kvm_allowed;
+
+    object_class_property_add(oc, "kvm-shadow-mem", "int",
+        kvm_get_kvm_shadow_mem, kvm_set_kvm_shadow_mem,
+        NULL, NULL, &error_abort);
+    object_class_property_set_description(oc, "kvm-shadow-mem",
+        "KVM shadow MMU size", &error_abort);
  }
static const TypeInfo kvm_accel_type = {
      .name = TYPE_KVM_ACCEL,
      .parent = TYPE_ACCEL,
+    .instance_init = kvm_accel_instance_init,
      .class_init = kvm_accel_class_init,
      .instance_size = sizeof(KVMState),
  };
diff --git a/hw/core/machine.c b/hw/core/machine.c
index d7a0356..bfb5f6f 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -211,33 +211,6 @@ static void machine_set_kernel_irqchip(Object *obj, 
Visitor *v,
      }
  }
-static void machine_get_kvm_shadow_mem(Object *obj, Visitor *v,
-                                       const char *name, void *opaque,
-                                       Error **errp)
-{
-    MachineState *ms = MACHINE(obj);
-    int64_t value = ms->kvm_shadow_mem;
-
-    visit_type_int(v, name, &value, errp);
-}
-
-static void machine_set_kvm_shadow_mem(Object *obj, Visitor *v,
-                                       const char *name, void *opaque,
-                                       Error **errp)
-{
-    MachineState *ms = MACHINE(obj);
-    Error *error = NULL;
-    int64_t value;
-
-    visit_type_int(v, name, &value, &error);
-    if (error) {
-        error_propagate(errp, error);
-        return;
-    }
-
-    ms->kvm_shadow_mem = value;
-}
-
  static char *machine_get_kernel(Object *obj, Error **errp)
  {
      MachineState *ms = MACHINE(obj);
@@ -785,12 +758,6 @@ static void machine_class_init(ObjectClass *oc, void *data)
      object_class_property_set_description(oc, "kernel-irqchip",
          "Configure KVM in-kernel irqchip", &error_abort);
- object_class_property_add(oc, "kvm-shadow-mem", "int",
-        machine_get_kvm_shadow_mem, machine_set_kvm_shadow_mem,
-        NULL, NULL, &error_abort);
-    object_class_property_set_description(oc, "kvm-shadow-mem",
-        "KVM shadow MMU size", &error_abort);
-
      object_class_property_add_str(oc, "kernel",
          machine_get_kernel, machine_set_kernel, &error_abort);
      object_class_property_set_description(oc, "kernel",
@@ -892,7 +859,6 @@ static void machine_initfn(Object *obj)
ms->kernel_irqchip_allowed = true;
      ms->kernel_irqchip_split = mc->default_kernel_irqchip_split;
-    ms->kvm_shadow_mem = -1;
      ms->dump_guest_core = true;
      ms->mem_merge = true;
      ms->enable_graphics = true;
@@ -963,11 +929,6 @@ bool machine_kernel_irqchip_split(MachineState *machine)
      return machine->kernel_irqchip_split;
  }
-int machine_kvm_shadow_mem(MachineState *machine)
-{
-    return machine->kvm_shadow_mem;
-}
-
  int machine_phandle_start(MachineState *machine)
  {
      return machine->phandle_start;
diff --git a/include/hw/boards.h b/include/hw/boards.h
index cdcf481..46119eb 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -66,7 +66,6 @@ bool machine_usb(MachineState *machine);
  bool machine_kernel_irqchip_allowed(MachineState *machine);
  bool machine_kernel_irqchip_required(MachineState *machine);
  bool machine_kernel_irqchip_split(MachineState *machine);
-int machine_kvm_shadow_mem(MachineState *machine);
  int machine_phandle_start(MachineState *machine);
  bool machine_dump_guest_core(MachineState *machine);
  bool machine_mem_merge(MachineState *machine);
@@ -278,7 +277,6 @@ struct MachineState {
      bool kernel_irqchip_allowed;
      bool kernel_irqchip_required;
      bool kernel_irqchip_split;
-    int kvm_shadow_mem;
      char *dtb;
      char *dumpdtb;
      int phandle_start;
diff --git a/qemu-options.hx b/qemu-options.hx
index 6f12b31..779c8af 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -34,7 +34,6 @@ DEF("machine", HAS_ARG, QEMU_OPTION_machine, \
      "                supported accelerators are kvm, xen, hax, hvf, whpx or tcg 
(default: tcg)\n"
      "                kernel_irqchip=on|off|split controls accelerated irqchip 
support (default=off)\n"
      "                vmport=on|off|auto controls emulation of vmport (default: 
auto)\n"
-    "                kvm_shadow_mem=size of KVM shadow MMU in bytes\n"
      "                dump-guest-core=on|off include guest memory in a core dump 
(default=on)\n"
      "                mem-merge=on|off controls memory merge support (default: 
on)\n"
      "                aes-key-wrap=on|off controls support for AES key wrapping 
(default=on)\n"
@@ -74,8 +73,6 @@ Controls in-kernel irqchip support for the chosen accelerator 
when available.
  Enables emulation of VMWare IO port, for vmmouse etc. auto says to select the
  value based on accel. For accel=xen the default is off otherwise the default
  is on.
-@item kvm_shadow_mem=size
-Defines the size of the KVM shadow MMU.
  @item dump-guest-core=on|off
  Include guest memory in a core dump. The default is on.
  @item mem-merge=on|off
@@ -118,6 +115,7 @@ DEF("accel", HAS_ARG, QEMU_OPTION_accel,
      "-accel [accel=]accelerator[,prop[=value][,...]]\n"
      "                select accelerator (kvm, xen, hax, hvf, whpx or tcg; use 
'help' for a list)\n"
      "                igd-passthru=on|off (enable Xen integrated Intel graphics 
passthrough, default=off)\n"
+    "                kvm-shadow-mem=size of KVM shadow MMU in bytes\n"
      "                tb-size=n (TCG translation block cache size)\n"
      "                thread=single|multi (enable multi-threaded TCG)\n", 
QEMU_ARCH_ALL)
  STEXI
@@ -131,6 +129,8 @@ fails to initialize.
  @item igd-passthru=on|off
  When Xen is in use, this option controls whether Intel integrated graphics
  devices can be passed through to the guest (default=off)
+@item kvm-shadow-mem=size
+Defines the size of the KVM shadow MMU.
  @item tb-size=@var{n}
  Controls the size (in MiB) of the TCG translation block cache.
  @item thread=single|multi
diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index 1d10046..62ce681 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -2163,7 +2163,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
      }
      qemu_register_reset(kvm_unpoison_all, NULL);
- shadow_mem = machine_kvm_shadow_mem(ms);
+    shadow_mem = object_property_get_int(OBJECT(s), "kvm-shadow-mem", 
&error_abort);
      if (shadow_mem != -1) {
          shadow_mem /= 4096;
          ret = kvm_vm_ioctl(s, KVM_SET_NR_MMU_PAGES, shadow_mem);
diff --git a/vl.c b/vl.c
index ee872f2..3678522 100644
--- a/vl.c
+++ b/vl.c
@@ -2639,6 +2639,10 @@ static int machine_set_property(void *opaque,
          object_register_sugar_prop(ACCEL_CLASS_NAME("xen"), qom_name, value);
          return 0;
      }
+    if (g_str_equal(qom_name, "kvm-shadow-mem")) {
+        object_register_sugar_prop(ACCEL_CLASS_NAME("kvm"), qom_name, value);
+        return 0;
+    }
return object_parse_property_opt(opaque, name, value, "type", errp);
  }


Nice.

Reviewed-by: Philippe Mathieu-Daudé <address@hidden>




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