On 8/2/24 18:07, Cédric Le Goater wrote:
+/*
+ * The MPS3 DDR is 3GiB, but on a 32-bit host QEMU doesn't permit
+ * emulation of that much guest RAM, so artificially make it smaller.
+ */
+#if HOST_LONG_BITS == 32
+#define MPS3_DDR_SIZE (1 * GiB)
+#else
+#define MPS3_DDR_SIZE (3 * GiB)
+#endif
Generically, can we migrate a VM started on a 32-bit host to a 64-bit
one?
I think it's one of those things that in theory is supposed
to be possible and in practice nobody tests so it might well
not work. At any rate, this is the same thing we do already
in mps2-tz.c for the 2GB DRAM those boards have.
We could have a common helper may be. Aspeed does:
/* On 32-bit hosts, lower RAM to 1G because of the 2047 MB limit */
#if HOST_LONG_BITS == 32
#define ASPEED_RAM_SIZE(sz) MIN((sz), 1 * GiB)
#else
#define ASPEED_RAM_SIZE(sz) (sz)
#endif
Or deprecate system emulation on 32-bit hosts.
