The ACPI spec predates the AARCH64 architecture by 5 versions, so there
is no point in supporting anything below v5.0. So set the PCD that
controls the ACPI table generation to the appropriate value.

Note that the current consumers of this PCD only check whether bit 1
is set or not (i.e., ACPI v1.0b), but this may change in the future,
so let's choose a meaningful value right away.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <[email protected]>
---
 ArmVirtPkg/ArmVirtQemu.dsc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ArmVirtPkg/ArmVirtQemu.dsc b/ArmVirtPkg/ArmVirtQemu.dsc
index e2641fd2c289..db6d277972d3 100644
--- a/ArmVirtPkg/ArmVirtQemu.dsc
+++ b/ArmVirtPkg/ArmVirtQemu.dsc
@@ -177,6 +177,10 @@ [PcdsFixedAtBuild.AARCH64]
   # point only, for entry point versions >= 3.0.
   gEfiMdeModulePkgTokenSpaceGuid.PcdSmbiosEntryPointProvideMethod|0x2
 
+  # ACPI predates the AARCH64 by 5 versions, so we only target OSes that
+  # support ACPI v5.0 or later
+  gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiExposedTableVersions|0x20
+
 [PcdsDynamicDefault.common]
   ## If TRUE, OvmfPkg/AcpiPlatformDxe will not wait for PCI
   #  enumeration to complete before installing ACPI tables.
-- 
2.5.0

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