| Message ID | 1580483390-131164-44-git-send-email-imammedo@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | refactor main RAM allocation to use hostmem backend | expand |
On Fri, Jan 31, 2020 at 04:09:13PM +0100, Igor Mammedov wrote: > memory_region_allocate_system_memory() API is going away, so > replace it with memdev allocated MemoryRegion. The later is > initialized by generic code, so board only needs to opt in > to memdev scheme by providing > MachineClass::default_ram_id > and using MachineState::ram instead of manually initializing > RAM memory region. > > Signed-off-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> But see by other comment - I think a bool flag to opt in, that can then be dropped for non-versioned boards would be nicer. E.g. use_memdev_for_ram. > --- > CC: mst@redhat.com > CC: pbonzini@redhat.com > CC: rth@twiddle.net > CC: ehabkost@redhat.com > --- > hw/i386/pc.c | 19 +++++++++---------- > 1 file changed, 9 insertions(+), 10 deletions(-) > > diff --git a/hw/i386/pc.c b/hw/i386/pc.c > index 2ddce42..6ab4acb 100644 > --- a/hw/i386/pc.c > +++ b/hw/i386/pc.c > @@ -937,7 +937,7 @@ void pc_memory_init(PCMachineState *pcms, > MemoryRegion **ram_memory) > { > int linux_boot, i; > - MemoryRegion *ram, *option_rom_mr; > + MemoryRegion *option_rom_mr; > MemoryRegion *ram_below_4g, *ram_above_4g; > FWCfgState *fw_cfg; > MachineState *machine = MACHINE(pcms); > @@ -950,22 +950,20 @@ void pc_memory_init(PCMachineState *pcms, > > linux_boot = (machine->kernel_filename != NULL); > > - /* Allocate RAM. We allocate it as a single memory region and use > - * aliases to address portions of it, mostly for backwards compatibility > - * with older qemus that used qemu_ram_alloc(). > + /* > + * Split single memory region and use aliases to address portions of it, > + * done for backwards compatibility with older qemus. > */ > - ram = g_malloc(sizeof(*ram)); > - memory_region_allocate_system_memory(ram, NULL, "pc.ram", > - machine->ram_size); > - *ram_memory = ram; > + *ram_memory = machine->ram; > ram_below_4g = g_malloc(sizeof(*ram_below_4g)); > - memory_region_init_alias(ram_below_4g, NULL, "ram-below-4g", ram, > + memory_region_init_alias(ram_below_4g, NULL, "ram-below-4g", machine->ram, > 0, x86ms->below_4g_mem_size); > memory_region_add_subregion(system_memory, 0, ram_below_4g); > e820_add_entry(0, x86ms->below_4g_mem_size, E820_RAM); > if (x86ms->above_4g_mem_size > 0) { > ram_above_4g = g_malloc(sizeof(*ram_above_4g)); > - memory_region_init_alias(ram_above_4g, NULL, "ram-above-4g", ram, > + memory_region_init_alias(ram_above_4g, NULL, "ram-above-4g", > + machine->ram, > x86ms->below_4g_mem_size, > x86ms->above_4g_mem_size); > memory_region_add_subregion(system_memory, 0x100000000ULL, > @@ -1952,6 +1950,7 @@ static void pc_machine_class_init(ObjectClass *oc, void *data) > mc->default_cpu_type = TARGET_DEFAULT_CPU_TYPE; > mc->nvdimm_supported = true; > mc->numa_mem_supported = true; > + mc->default_ram_id = "pc.ram"; > > object_class_property_add(oc, PC_MACHINE_DEVMEM_REGION_SIZE, "int", > pc_machine_get_device_memory_region_size, NULL, > -- > 2.7.4 > >
On Mon, 3 Feb 2020 04:07:12 -0500 "Michael S. Tsirkin" <mst@redhat.com> wrote: > On Fri, Jan 31, 2020 at 04:09:13PM +0100, Igor Mammedov wrote: > > memory_region_allocate_system_memory() API is going away, so > > replace it with memdev allocated MemoryRegion. The later is > > initialized by generic code, so board only needs to opt in > > to memdev scheme by providing > > MachineClass::default_ram_id > > and using MachineState::ram instead of manually initializing > > RAM memory region. > > > > Signed-off-by: Igor Mammedov <imammedo@redhat.com> > > > Reviewed-by: Michael S. Tsirkin <mst@redhat.com> > thanks! > But see by other comment - I think a bool flag to opt in, > that can then be dropped for non-versioned boards would be nicer. > > E.g. use_memdev_for_ram. It could be done on top as cleanup patch, similar to dropped: "[PATCH v2 76/86] post conversion default_ram_id cleanup" but it needs some more thought on what direction we would like to go wrt these boards and boards with fixed RAM size. Goal of this series is replacing memory_region_allocate_system_memory() with hostmem based allocation. Whether non-versioned boards used the former for a good reason or it was used just as copied as template is a topic for another series. Personally, for boards with fixed RAM size I'd just make usage of "-m" error out saying that size is fixed and can't be set by user. (that should clean up quite a bit of code). And on top of that convert them to plain memory_region_init_ram() as they do not really need flexibility hostmem provides. So that pattern would be copied to new embed boards and -m optin used only in cases where board really needs it. > > --- > > CC: mst@redhat.com > > CC: pbonzini@redhat.com > > CC: rth@twiddle.net > > CC: ehabkost@redhat.com > > --- > > hw/i386/pc.c | 19 +++++++++---------- > > 1 file changed, 9 insertions(+), 10 deletions(-) > > > > diff --git a/hw/i386/pc.c b/hw/i386/pc.c > > index 2ddce42..6ab4acb 100644 > > --- a/hw/i386/pc.c > > +++ b/hw/i386/pc.c > > @@ -937,7 +937,7 @@ void pc_memory_init(PCMachineState *pcms, > > MemoryRegion **ram_memory) > > { > > int linux_boot, i; > > - MemoryRegion *ram, *option_rom_mr; > > + MemoryRegion *option_rom_mr; > > MemoryRegion *ram_below_4g, *ram_above_4g; > > FWCfgState *fw_cfg; > > MachineState *machine = MACHINE(pcms); > > @@ -950,22 +950,20 @@ void pc_memory_init(PCMachineState *pcms, > > > > linux_boot = (machine->kernel_filename != NULL); > > > > - /* Allocate RAM. We allocate it as a single memory region and use > > - * aliases to address portions of it, mostly for backwards compatibility > > - * with older qemus that used qemu_ram_alloc(). > > + /* > > + * Split single memory region and use aliases to address portions of it, > > + * done for backwards compatibility with older qemus. > > */ > > - ram = g_malloc(sizeof(*ram)); > > - memory_region_allocate_system_memory(ram, NULL, "pc.ram", > > - machine->ram_size); > > - *ram_memory = ram; > > + *ram_memory = machine->ram; > > ram_below_4g = g_malloc(sizeof(*ram_below_4g)); > > - memory_region_init_alias(ram_below_4g, NULL, "ram-below-4g", ram, > > + memory_region_init_alias(ram_below_4g, NULL, "ram-below-4g", machine->ram, > > 0, x86ms->below_4g_mem_size); > > memory_region_add_subregion(system_memory, 0, ram_below_4g); > > e820_add_entry(0, x86ms->below_4g_mem_size, E820_RAM); > > if (x86ms->above_4g_mem_size > 0) { > > ram_above_4g = g_malloc(sizeof(*ram_above_4g)); > > - memory_region_init_alias(ram_above_4g, NULL, "ram-above-4g", ram, > > + memory_region_init_alias(ram_above_4g, NULL, "ram-above-4g", > > + machine->ram, > > x86ms->below_4g_mem_size, > > x86ms->above_4g_mem_size); > > memory_region_add_subregion(system_memory, 0x100000000ULL, > > @@ -1952,6 +1950,7 @@ static void pc_machine_class_init(ObjectClass *oc, void *data) > > mc->default_cpu_type = TARGET_DEFAULT_CPU_TYPE; > > mc->nvdimm_supported = true; > > mc->numa_mem_supported = true; > > + mc->default_ram_id = "pc.ram"; > > > > object_class_property_add(oc, PC_MACHINE_DEVMEM_REGION_SIZE, "int", > > pc_machine_get_device_memory_region_size, NULL, > > -- > > 2.7.4 > > > > > >
diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 2ddce42..6ab4acb 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -937,7 +937,7 @@ void pc_memory_init(PCMachineState *pcms, MemoryRegion **ram_memory) { int linux_boot, i; - MemoryRegion *ram, *option_rom_mr; + MemoryRegion *option_rom_mr; MemoryRegion *ram_below_4g, *ram_above_4g; FWCfgState *fw_cfg; MachineState *machine = MACHINE(pcms); @@ -950,22 +950,20 @@ void pc_memory_init(PCMachineState *pcms, linux_boot = (machine->kernel_filename != NULL); - /* Allocate RAM. We allocate it as a single memory region and use - * aliases to address portions of it, mostly for backwards compatibility - * with older qemus that used qemu_ram_alloc(). + /* + * Split single memory region and use aliases to address portions of it, + * done for backwards compatibility with older qemus. */ - ram = g_malloc(sizeof(*ram)); - memory_region_allocate_system_memory(ram, NULL, "pc.ram", - machine->ram_size); - *ram_memory = ram; + *ram_memory = machine->ram; ram_below_4g = g_malloc(sizeof(*ram_below_4g)); - memory_region_init_alias(ram_below_4g, NULL, "ram-below-4g", ram, + memory_region_init_alias(ram_below_4g, NULL, "ram-below-4g", machine->ram, 0, x86ms->below_4g_mem_size); memory_region_add_subregion(system_memory, 0, ram_below_4g); e820_add_entry(0, x86ms->below_4g_mem_size, E820_RAM); if (x86ms->above_4g_mem_size > 0) { ram_above_4g = g_malloc(sizeof(*ram_above_4g)); - memory_region_init_alias(ram_above_4g, NULL, "ram-above-4g", ram, + memory_region_init_alias(ram_above_4g, NULL, "ram-above-4g", + machine->ram, x86ms->below_4g_mem_size, x86ms->above_4g_mem_size); memory_region_add_subregion(system_memory, 0x100000000ULL, @@ -1952,6 +1950,7 @@ static void pc_machine_class_init(ObjectClass *oc, void *data) mc->default_cpu_type = TARGET_DEFAULT_CPU_TYPE; mc->nvdimm_supported = true; mc->numa_mem_supported = true; + mc->default_ram_id = "pc.ram"; object_class_property_add(oc, PC_MACHINE_DEVMEM_REGION_SIZE, "int", pc_machine_get_device_memory_region_size, NULL,
memory_region_allocate_system_memory() API is going away, so replace it with memdev allocated MemoryRegion. The later is initialized by generic code, so board only needs to opt in to memdev scheme by providing MachineClass::default_ram_id and using MachineState::ram instead of manually initializing RAM memory region. Signed-off-by: Igor Mammedov <imammedo@redhat.com> --- CC: mst@redhat.com CC: pbonzini@redhat.com CC: rth@twiddle.net CC: ehabkost@redhat.com --- hw/i386/pc.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-)