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microvm: use 3G split unconditionally

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Looks like the logic was copied over from q35.

q35 does this for backward compatibility, there is no reason to do this
on microvm though.  Also microvm doesn't need much mmio space, 1G is
more than enough.  Using an mmio window smaller than 1G is bad for
gigabyte alignment and hugepages though.  So split @ 3G unconditionally.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-id: 20200529073957.8018-2-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2020-05-29 09:39:54 +02:00
parent 5c24bce305
commit e289655cea
1 changed files with 1 additions and 15 deletions
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16
hw/i386/microvm.c
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@ -170,23 +170,9 @@ static void microvm_memory_init(MicrovmMachineState *mms)
MemoryRegion *ram_below_4g, *ram_above_4g;
MemoryRegion *system_memory = get_system_memory();
FWCfgState *fw_cfg;
ram_addr_t lowmem;
ram_addr_t lowmem = 0xc0000000; /* 3G */
int i;
/*
* Check whether RAM fits below 4G (leaving 1/2 GByte for IO memory
* and 256 Mbytes for PCI Express Enhanced Configuration Access Mapping
* also known as MMCFG).
* If it doesn't, we need to split it in chunks below and above 4G.
* In any case, try to make sure that guest addresses aligned at
* 1G boundaries get mapped to host addresses aligned at 1G boundaries.
*/
if (machine->ram_size >= 0xb0000000) {
lowmem = 0x80000000;
} else {
lowmem = 0xb0000000;
}
/*
* Handle the machine opt max-ram-below-4g. It is basically doing
* min(qemu limit, user limit).