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kvm: convert "-machine kernel_irqchip" to an accelerator property

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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2019-11-13 10:56:53 +01:00
parent 4376c40ded
commit 11bc4a13d1
5 changed files with 62 additions and 73 deletions
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59
accel/kvm/kvm-all.c
View File

@ -42,6 +42,8 @@
#include "sysemu/sev.h"
#include "sysemu/balloon.h"
#include "qapi/visitor.h"
#include "qapi/qapi-types-common.h"
#include "qapi/qapi-visit-common.h"
#include "hw/boards.h"
@ -94,6 +96,9 @@ struct KVMState
int many_ioeventfds;
int intx_set_mask;
int kvm_shadow_mem;
bool kernel_irqchip_allowed;
bool kernel_irqchip_required;
bool kernel_irqchip_split;
bool sync_mmu;
bool manual_dirty_log_protect;
/* The man page (and posix) say ioctl numbers are signed int, but
@ -1794,7 +1799,7 @@ static void kvm_irqchip_create(KVMState *s)
* in-kernel irqchip for us */
ret = kvm_arch_irqchip_create(s);
if (ret == 0) {
if (kvm_kernel_irqchip_split()) {
if (s->kernel_irqchip_split) {
perror("Split IRQ chip mode not supported.");
exit(1);
} else {
@ -2065,7 +2070,7 @@ static int kvm_init(MachineState *ms)
goto err;
}
if (machine_kernel_irqchip_allowed(ms)) {
if (s->kernel_irqchip_allowed) {
kvm_irqchip_create(s);
}
@ -2983,19 +2988,57 @@ static void kvm_set_kvm_shadow_mem(Object *obj, Visitor *v,
s->kvm_shadow_mem = value;
}
static void kvm_set_kernel_irqchip(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
Error *err = NULL;
KVMState *s = KVM_STATE(obj);
OnOffSplit mode;
visit_type_OnOffSplit(v, name, &mode, &err);
if (err) {
error_propagate(errp, err);
return;
} else {
switch (mode) {
case ON_OFF_SPLIT_ON:
s->kernel_irqchip_allowed = true;
s->kernel_irqchip_required = true;
s->kernel_irqchip_split = false;
break;
case ON_OFF_SPLIT_OFF:
s->kernel_irqchip_allowed = false;
s->kernel_irqchip_required = false;
s->kernel_irqchip_split = false;
break;
case ON_OFF_SPLIT_SPLIT:
s->kernel_irqchip_allowed = true;
s->kernel_irqchip_required = true;
s->kernel_irqchip_split = true;
break;
default:
/* The value was checked in visit_type_OnOffSplit() above. If
* we get here, then something is wrong in QEMU.
*/
abort();
}
}
}
bool kvm_kernel_irqchip_allowed(void)
{
return machine_kernel_irqchip_allowed(current_machine);
return kvm_state->kernel_irqchip_allowed;
}
bool kvm_kernel_irqchip_required(void)
{
return machine_kernel_irqchip_required(current_machine);
return kvm_state->kernel_irqchip_required;
}
bool kvm_kernel_irqchip_split(void)
{
return machine_kernel_irqchip_split(current_machine);
return kvm_state->kernel_irqchip_split;
}
static void kvm_accel_instance_init(Object *obj)
@ -3013,6 +3056,12 @@ static void kvm_accel_class_init(ObjectClass *oc, void *data)
ac->has_memory = kvm_accel_has_memory;
ac->allowed = &kvm_allowed;
object_class_property_add(oc, "kernel-irqchip", "on|off|split",
NULL, kvm_set_kernel_irqchip,
NULL, NULL, &error_abort);
object_class_property_set_description(oc, "kernel-irqchip",
"Configure KVM in-kernel irqchip", &error_abort);
object_class_property_add(oc, "kvm-shadow-mem", "int",
kvm_get_kvm_shadow_mem, kvm_set_kvm_shadow_mem,
NULL, NULL, &error_abort);

61
hw/core/machine.c
View File

@ -178,44 +178,6 @@ GlobalProperty hw_compat_2_1[] = {
};
const size_t hw_compat_2_1_len = G_N_ELEMENTS(hw_compat_2_1);
static void machine_set_kernel_irqchip(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
Error *err = NULL;
MachineState *ms = MACHINE(obj);
OnOffSplit mode;
visit_type_OnOffSplit(v, name, &mode, &err);
if (err) {
error_propagate(errp, err);
return;
} else {
switch (mode) {
case ON_OFF_SPLIT_ON:
ms->kernel_irqchip_allowed = true;
ms->kernel_irqchip_required = true;
ms->kernel_irqchip_split = false;
break;
case ON_OFF_SPLIT_OFF:
ms->kernel_irqchip_allowed = false;
ms->kernel_irqchip_required = false;
ms->kernel_irqchip_split = false;
break;
case ON_OFF_SPLIT_SPLIT:
ms->kernel_irqchip_allowed = true;
ms->kernel_irqchip_required = true;
ms->kernel_irqchip_split = true;
break;
default:
/* The value was checked in visit_type_OnOffSplit() above. If
* we get here, then something is wrong in QEMU.
*/
abort();
}
}
}
static char *machine_get_kernel(Object *obj, Error **errp)
{
MachineState *ms = MACHINE(obj);
@ -757,12 +719,6 @@ static void machine_class_init(ObjectClass *oc, void *data)
mc->numa_mem_align_shift = 23;
mc->numa_auto_assign_ram = numa_default_auto_assign_ram;
object_class_property_add(oc, "kernel-irqchip", "on|off|split",
NULL, machine_set_kernel_irqchip,
NULL, NULL, &error_abort);
object_class_property_set_description(oc, "kernel-irqchip",
"Configure KVM in-kernel irqchip", &error_abort);
object_class_property_add_str(oc, "kernel",
machine_get_kernel, machine_set_kernel, &error_abort);
object_class_property_set_description(oc, "kernel",
@ -862,8 +818,6 @@ static void machine_initfn(Object *obj)
MachineState *ms = MACHINE(obj);
MachineClass *mc = MACHINE_GET_CLASS(obj);
ms->kernel_irqchip_allowed = true;
ms->kernel_irqchip_split = mc->default_kernel_irqchip_split;
ms->dump_guest_core = true;
ms->mem_merge = true;
ms->enable_graphics = true;
@ -919,21 +873,6 @@ bool machine_usb(MachineState *machine)
return machine->usb;
}
bool machine_kernel_irqchip_allowed(MachineState *machine)
{
return machine->kernel_irqchip_allowed;
}
bool machine_kernel_irqchip_required(MachineState *machine)
{
return machine->kernel_irqchip_required;
}
bool machine_kernel_irqchip_split(MachineState *machine)
{
return machine->kernel_irqchip_split;
}
int machine_phandle_start(MachineState *machine)
{
return machine->phandle_start;

3
include/hw/boards.h
View File

@ -63,9 +63,6 @@ extern MachineState *current_machine;
void machine_run_board_init(MachineState *machine);
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_phandle_start(MachineState *machine);
bool machine_dump_guest_core(MachineState *machine);
bool machine_mem_merge(MachineState *machine);

9
qemu-options.hx
View File

@ -32,7 +32,6 @@ DEF("machine", HAS_ARG, QEMU_OPTION_machine, \
" selects emulated machine ('-machine help' for list)\n"
" property accel=accel1[:accel2[:...]] selects accelerator\n"
" 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"
" 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"
@ -67,8 +66,6 @@ This is used to enable an accelerator. Depending on the target architecture,
kvm, xen, hax, hvf, whpx or tcg can be available. By default, tcg is used. If there is
more than one accelerator specified, the next one is used if the previous one
fails to initialize.
@item kernel_irqchip=on|off
Controls in-kernel irqchip support for the chosen accelerator when available.
@item vmport=on|off|auto
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
@ -115,6 +112,7 @@ 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"
" kernel-irqchip=on|off|split controls accelerated irqchip support (default=on)\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)
@ -129,6 +127,11 @@ 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 kernel-irqchip=on|off|split
Controls KVM in-kernel irqchip support. The default is full acceleration of the
interrupt controllers. On x86, split irqchip reduces the kernel attack
surface, at a performance cost for non-MSI interrupts. Disabling the in-kernel
irqchip completely is not recommended except for debugging purposes.
@item kvm-shadow-mem=size
Defines the size of the KVM shadow MMU.
@item tb-size=@var{n}

3
vl.c
View File

@ -2514,7 +2514,8 @@ 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")) {
if (g_str_equal(qom_name, "kvm-shadow-mem") ||
g_str_equal(qom_name, "kernel-irqchip")) {
object_register_sugar_prop(ACCEL_CLASS_NAME("kvm"), qom_name, value);
return 0;
}