OvmfPkg/Bhyve: add support for QemuFwCfg

QemuFwCfg is much more powerful than BhyveFwCtl. Sadly, BhyveFwCtl
decided to use the same IO ports as QemuFwCfg. It's not possible to use
both interfaces simultaneously. So, prefer QemuFwCfg over BhyveFwCtl.

Signed-off-by: Corvin Köhne <c.koehne@beckhoff.com>
Reviewed-by: Rebecca Cran <rebecca@bsdio.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Peter Grehan <grehan@freebsd.org>
Acked-by: Jiewen Yao <jiewen.yao@intel.com>

OvmfPkg/Bhyve/AcpiPlatformDxe/AcpiPlatformDxe.inf

@@ -43,6 +43,7 @@
   MemoryAllocationLib
   OrderedCollectionLib
   PcdLib
+  QemuFwCfgLib
   UefiBootServicesTableLib
   UefiDriverEntryPoint
   UefiLib

OvmfPkg/Bhyve/AcpiPlatformDxe/Bhyve.c

@@ -11,6 +11,41 @@
 #include <Library/BaseMemoryLib.h>
 #include <Library/BhyveFwCtlLib.h>
 #include <Library/MemoryAllocationLib.h>
+#include <Library/QemuFwCfgLib.h>             // QemuFwCfgFindFile()
+
+STATIC
+EFI_STATUS
+EFIAPI
+BhyveGetCpuCount (
+  OUT UINT32  *CpuCount
+  )
+{
+  FIRMWARE_CONFIG_ITEM  Item;
+  UINTN                 Size;
+
+  if (QemuFwCfgIsAvailable ()) {
+    if (EFI_ERROR (QemuFwCfgFindFile ("opt/bhyve/hw.ncpu", &Item, &Size))) {
+      return EFI_NOT_FOUND;
+    } else if (Size != sizeof (*CpuCount)) {
+      return EFI_BAD_BUFFER_SIZE;
+    }
+
+    QemuFwCfgSelectItem (Item);
+    QemuFwCfgReadBytes (Size, CpuCount);
+
+    return EFI_SUCCESS;
+  }
+
+  //
+  // QemuFwCfg not available, try BhyveFwCtl.
+  //
+  Size = sizeof (*CpuCount);
+  if (BhyveFwCtlGet ("hw.ncpu", CpuCount, &Size) == RETURN_SUCCESS) {
+    return EFI_SUCCESS;
+  }
+
+  return EFI_UNSUPPORTED;
+}
 
 STATIC
 EFI_STATUS
@@ -23,7 +58,6 @@ BhyveInstallAcpiMadtTable (
   )
 {
   UINT32                                               CpuCount;
-  UINTN                                                cSize;
   UINTN                                                NewBufferSize;
   EFI_ACPI_1_0_MULTIPLE_APIC_DESCRIPTION_TABLE_HEADER  *Madt;
   EFI_ACPI_1_0_PROCESSOR_LOCAL_APIC_STRUCTURE          *LocalApic;
@@ -36,9 +70,8 @@ BhyveInstallAcpiMadtTable (
   ASSERT (AcpiTableBufferSize >= sizeof (EFI_ACPI_DESCRIPTION_HEADER));
 
   // Query the host for the number of vCPUs
-  CpuCount = 0;
+  Status = BhyveGetCpuCount (&CpuCount);
-  cSize    = sizeof (CpuCount);
+  if (!EFI_ERROR (Status)) {
-  if (BhyveFwCtlGet ("hw.ncpu", &CpuCount, &cSize) == RETURN_SUCCESS) {
     DEBUG ((DEBUG_INFO, "Retrieved CpuCount %d\n", CpuCount));
     ASSERT (CpuCount >= 1);
   } else {

OvmfPkg/Bhyve/BhyveX64.dsc

@@ -164,8 +164,7 @@
   SecurityManagementLib|MdeModulePkg/Library/DxeSecurityManagementLib/DxeSecurityManagementLib.inf
   UefiUsbLib|MdePkg/Library/UefiUsbLib/UefiUsbLib.inf
   SerializeVariablesLib|OvmfPkg/Library/SerializeVariablesLib/SerializeVariablesLib.inf
-  QemuFwCfgLib|OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLibNull.inf
+  QemuFwCfgLib|OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxeLib.inf
-  QemuFwCfgS3Lib|OvmfPkg/Library/QemuFwCfgS3Lib/BaseQemuFwCfgS3LibNull.inf
   BhyveFwCtlLib|OvmfPkg/Library/BhyveFwCtlLib/BhyveFwCtlLib.inf
   VirtioLib|OvmfPkg/Library/VirtioLib/VirtioLib.inf
   MemEncryptSevLib|OvmfPkg/Library/BaseMemEncryptSevLib/DxeMemEncryptSevLib.inf
@@ -358,6 +357,7 @@
 !endif
   PciLib|OvmfPkg/Library/DxePciLibI440FxQ35/DxePciLibI440FxQ35.inf
   MpInitLib|UefiCpuPkg/Library/MpInitLibUp/MpInitLibUp.inf
+  QemuFwCfgS3Lib|OvmfPkg/Library/QemuFwCfgS3Lib/DxeQemuFwCfgS3LibFwCfg.inf
 
 [LibraryClasses.common.UEFI_APPLICATION]
   PcdLib|MdePkg/Library/DxePcdLib/DxePcdLib.inf