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pc: Reverse pc_init_pci() compatibility logic 

Currently, the pc-1.4 machine init function enables PV EOI and then
calls the pc-1.2 machine init function. The problem with this approach
is that now we can't enable any additional compatibility code inside the
pc-1.2 init function because it would end up enabling the compatibility
behavior on pc-1.3 and pc-1.4 as well.

This reverses the logic so that the pc-1.2 machine init function will
disable PV EOI, and then call the pc-1.4 machine init function.

This way we can change older machine-types to enable compatibility
behavior, and the newer machine-types (pc-1.3, pc-q35-1.4 and
pc-i440fx-1.4) would just use the default behavior.

(This means that one nice side-effect of this change is that pc-q35-1.4
will get PV EOI enabled by default, too)

It would be interesting to eventually change pc_init_pci_no_kvmclock()
and pc_init_isa() to reuse pc_init_pci_1_2() as well (so we don't need
to duplicate compatibility code on those two functions). But this will
be probably much easier to do after we create a PCInitArgs struct for
the PC initialization arguments, and/or after we use global-properties
to implement the compatibility modes present in pc_init_pci_1_2().

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
This commit is contained in:
Eduardo Habkost 2013-01-17 18:59:29 -02:00 committed by Andreas Färber
parent aa87d45855
commit 2969475869
3 changed files with 17 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
hw/pc_piix.c
View File

@ -233,12 +233,14 @@ static void pc_init_pci(QEMUMachineInitArgs *args)
initrd_filename, cpu_model, 1, 1);
}
static void pc_init_pci_1_3(QEMUMachineInitArgs *args)
/* PC machine init function for pc-0.14 to pc-1.2 */
static void pc_init_pci_1_2(QEMUMachineInitArgs *args)
{
enable_kvm_pv_eoi();
disable_kvm_pv_eoi();
pc_init_pci(args);
}
/* PC init function for pc-0.10 to pc-0.13, and reused by xenfv */
static void pc_init_pci_no_kvmclock(QEMUMachineInitArgs *args)
{
ram_addr_t ram_size = args->ram_size;
@ -247,6 +249,7 @@ static void pc_init_pci_no_kvmclock(QEMUMachineInitArgs *args)
const char *kernel_cmdline = args->kernel_cmdline;
const char *initrd_filename = args->initrd_filename;
const char *boot_device = args->boot_device;
disable_kvm_pv_eoi();
pc_init1(get_system_memory(),
get_system_io(),
ram_size, boot_device,
@ -264,6 +267,7 @@ static void pc_init_isa(QEMUMachineInitArgs *args)
const char *boot_device = args->boot_device;
if (cpu_model == NULL)
cpu_model = "486";
disable_kvm_pv_eoi();
pc_init1(get_system_memory(),
get_system_io(),
ram_size, boot_device,
@ -286,7 +290,7 @@ static QEMUMachine pc_i440fx_machine_v1_4 = {
.name = "pc-i440fx-1.4",
.alias = "pc",
.desc = "Standard PC (i440FX + PIIX, 1996)",
.init = pc_init_pci_1_3,
.init = pc_init_pci,
.max_cpus = 255,
.is_default = 1,
DEFAULT_MACHINE_OPTIONS,
@ -302,7 +306,7 @@ static QEMUMachine pc_i440fx_machine_v1_4 = {
static QEMUMachine pc_machine_v1_3 = {
.name = "pc-1.3",
.desc = "Standard PC",
.init = pc_init_pci_1_3,
.init = pc_init_pci,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_1_3,
@ -342,7 +346,7 @@ static QEMUMachine pc_machine_v1_3 = {
static QEMUMachine pc_machine_v1_2 = {
.name = "pc-1.2",
.desc = "Standard PC",
.init = pc_init_pci,
.init = pc_init_pci_1_2,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_1_2,
@ -386,7 +390,7 @@ static QEMUMachine pc_machine_v1_2 = {
static QEMUMachine pc_machine_v1_1 = {
.name = "pc-1.1",
.desc = "Standard PC",
.init = pc_init_pci,
.init = pc_init_pci_1_2,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_1_1,
@ -422,7 +426,7 @@ static QEMUMachine pc_machine_v1_1 = {
static QEMUMachine pc_machine_v1_0 = {
.name = "pc-1.0",
.desc = "Standard PC",
.init = pc_init_pci,
.init = pc_init_pci_1_2,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_1_0,
@ -438,7 +442,7 @@ static QEMUMachine pc_machine_v1_0 = {
static QEMUMachine pc_machine_v0_15 = {
.name = "pc-0.15",
.desc = "Standard PC",
.init = pc_init_pci,
.init = pc_init_pci_1_2,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_0_15,
@ -471,7 +475,7 @@ static QEMUMachine pc_machine_v0_15 = {
static QEMUMachine pc_machine_v0_14 = {
.name = "pc-0.14",
.desc = "Standard PC",
.init = pc_init_pci,
.init = pc_init_pci_1_2,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_0_14,

5
target-i386/cpu.c
View File

@ -211,11 +211,12 @@ static uint32_t kvm_default_features = (1 << KVM_FEATURE_CLOCKSOURCE) |
(1 << KVM_FEATURE_CLOCKSOURCE2) |
(1 << KVM_FEATURE_ASYNC_PF) |
(1 << KVM_FEATURE_STEAL_TIME) |
(1 << KVM_FEATURE_PV_EOI) |
(1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT);
void enable_kvm_pv_eoi(void)
void disable_kvm_pv_eoi(void)
{
kvm_default_features |= (1UL << KVM_FEATURE_PV_EOI);
kvm_default_features &= ~(1UL << KVM_FEATURE_PV_EOI);
}
void host_cpuid(uint32_t function, uint32_t count,

2
target-i386/cpu.h
View File

@ -1250,7 +1250,7 @@ void do_smm_enter(CPUX86State *env1);
void cpu_report_tpr_access(CPUX86State *env, TPRAccess access);
void enable_kvm_pv_eoi(void);
void disable_kvm_pv_eoi(void);
/* Return name of 32-bit register, from a R_* constant */
const char *get_register_name_32(unsigned int reg);