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8598b45a95
For SEV-SNP guests using IGVM, the ACPI tables and system
configuration (MP tables, EBDA, SMBIOS, PVH start info, e820)
are provided by the IGVM file. The rsdp_addr is set to None
for these guests to indicate ACPI table creation was skipped.
Commit 7d65187350 ("vmm: make RSDP address optional in
configure_system") removed the guard that prevented calling
configure_system when rsdp_addr is None. This caused MSHV
SEV-SNP guests to crash because configure_system writes to
guest memory locations that conflict with the IGVM-provided
layout.
Restore the guard by only calling configure_system when
rsdp_addr is Some, which preserves the intended behavior
for CVM guests while still allowing the Option<GuestAddress>
refactoring.
Assisted-by: Claude:Opus-4.6
Signed-off-by: Muminul Islam <muislam@microsoft.com>