[PATCH v3] OvmfPkg/BhyveBhfPkg: add support for QemuFwCfg

From: Corvin Köhne <CorvinK@beckhoff.com>

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>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Rebecca Cran <rebecca@bsdio.com>
Acked-by: Peter Grehan <grehan@freebsd.org>
CC: Ard Biesheuvel <ardb+tianocore@kernel.org>
CC: Jiewen Yao <jiewen.yao@intel.com>
CC: Jordan Justen <jordan.l.justen@intel.com>
CC: devel@edk2.groups.io
CC: FreeBSD Virtualization <freebsd-virtualization@freebsd.org>
---
 OvmfPkg/Bhyve/AcpiPlatformDxe/AcpiPlatformDxe.inf |  1 +
 OvmfPkg/Bhyve/AcpiPlatformDxe/Bhyve.c             | 41 ++++++++++++++++++++---
 OvmfPkg/Bhyve/BhyveX64.dsc                        |  4 +--
 3 files changed, 40 insertions(+), 6 deletions(-)

diff --git a/OvmfPkg/Bhyve/AcpiPlatformDxe/AcpiPlatformDxe.inf b/OvmfPkg/Bhyve/AcpiPlatformDxe/AcpiPlatformDxe.inf
index 595fd055f9..94c65f32dc 100644
--- a/OvmfPkg/Bhyve/AcpiPlatformDxe/AcpiPlatformDxe.inf
+++ b/OvmfPkg/Bhyve/AcpiPlatformDxe/AcpiPlatformDxe.inf
@@ -43,6 +43,7 @@
   MemoryAllocationLib
   OrderedCollectionLib
   PcdLib
+  QemuFwCfgLib
   UefiBootServicesTableLib
   UefiDriverEntryPoint
   UefiLib
diff --git a/OvmfPkg/Bhyve/AcpiPlatformDxe/Bhyve.c b/OvmfPkg/Bhyve/AcpiPlatformDxe/Bhyve.c
index 8e80aa33e1..e216a21bfa 100644
--- a/OvmfPkg/Bhyve/AcpiPlatformDxe/Bhyve.c
+++ b/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;
-  cSize    = sizeof (CpuCount);
-  if (BhyveFwCtlGet ("hw.ncpu", &CpuCount, &cSize) == RETURN_SUCCESS) {
+  Status = BhyveGetCpuCount (&CpuCount);
+  if (!EFI_ERROR (Status)) {
     DEBUG ((DEBUG_INFO, "Retrieved CpuCount %d\n", CpuCount));
     ASSERT (CpuCount >= 1);
   } else {
diff --git a/OvmfPkg/Bhyve/BhyveX64.dsc b/OvmfPkg/Bhyve/BhyveX64.dsc
index 5fa08bebd7..14070fd6dd 100644
--- a/OvmfPkg/Bhyve/BhyveX64.dsc
+++ b/OvmfPkg/Bhyve/BhyveX64.dsc
@@ -163,8 +163,7 @@
   SecurityManagementLib|MdeModulePkg/Library/DxeSecurityManagementLib/DxeSecurityManagementLib.inf
   UefiUsbLib|MdePkg/Library/UefiUsbLib/UefiUsbLib.inf
   SerializeVariablesLib|OvmfPkg/Library/SerializeVariablesLib/SerializeVariablesLib.inf
-  QemuFwCfgLib|OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLibNull.inf
-  QemuFwCfgS3Lib|OvmfPkg/Library/QemuFwCfgS3Lib/BaseQemuFwCfgS3LibNull.inf
+  QemuFwCfgLib|OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxeLib.inf
   BhyveFwCtlLib|OvmfPkg/Library/BhyveFwCtlLib/BhyveFwCtlLib.inf
   VirtioLib|OvmfPkg/Library/VirtioLib/VirtioLib.inf
   MemEncryptSevLib|OvmfPkg/Library/BaseMemEncryptSevLib/DxeMemEncryptSevLib.inf
@@ -355,6 +354,7 @@
 !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
-- 
2.11.0

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