Re: [edk2-devel] [PATCH v3 2/2] OvmfPkg/Bhyve: use static PCI32Base address

[Rebecca Cran]

Acked-by: Rebecca Cran <rebe...@bsdio.com>

On 7/1/21 6:01 AM, Corvin Köhne wrote:

It's neccessary to allocate a Graphics Stolen Memory area to enable
GPU-Passthrough for integrated Intel GPUs. Therefore, use a new
memory layout with a static Pci32Baseaddress.

Old layout:
        [...        , lowmemlimit] RAM
        [lowmemlimit, 0xE000 0000] PCI Space
New layout:
        [...        , lowmemlimit] RAM
        [lowmemlimit, gsmbase    ] Memory hole (may be absent)
        [gsmbase    , 0xC000 0000] GSM (may be absent)
        [0xC000 0000, 0xE000 0000] PCI Space
---
  OvmfPkg/Bhyve/BhyveX64.dsc           | 4 ++--
  OvmfPkg/Bhyve/PlatformPei/Platform.c | 4 +++-
  2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/OvmfPkg/Bhyve/BhyveX64.dsc b/OvmfPkg/Bhyve/BhyveX64.dsc
index a0a2071b86..c435dadc0a 100644
--- a/OvmfPkg/Bhyve/BhyveX64.dsc
+++ b/OvmfPkg/Bhyve/BhyveX64.dsc
@@ -537,8 +537,8 @@
    gUefiOvmfPkgTokenSpaceGuid.PcdOvmfHostBridgePciDevId|0
    gUefiOvmfPkgTokenSpaceGuid.PcdPciIoBase|0x0
    gUefiOvmfPkgTokenSpaceGuid.PcdPciIoSize|0x0
-  gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio32Base|0x0
-  gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio32Size|0x0
+  gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio32Base|0xC0000000
+  gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio32Size|0x20000000
    gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio64Base|0x0
    gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio64Size|0x800000000

diff --git a/OvmfPkg/Bhyve/PlatformPei/Platform.c b/OvmfPkg/Bhyve/PlatformPei/Platform.c

index 3a414ffcb7..f38e74ccfc 100644
--- a/OvmfPkg/Bhyve/PlatformPei/Platform.c
+++ b/OvmfPkg/Bhyve/PlatformPei/Platform.c
@@ -191,7 +191,9 @@ MemMapInitialization (
        ASSERT (PciExBarBase <= MAX_UINT32 - SIZE_256MB);
        PciBase = (UINT32)(PciExBarBase + SIZE_256MB);
      } else {
-      PciBase = (TopOfLowRam < BASE_2GB) ? BASE_2GB : TopOfLowRam;
+      PciBase = PcdGet64(PcdPciMmio32Base);
+      if (PciBase == 0)
+        PciBase = (TopOfLowRam < BASE_2GB) ? BASE_2GB : TopOfLowRam;
      }

//

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