README.md

OVMF-win7-hyperv

A patched version of OVMF that works with hyperv in win7 guests

Windows 7 will fail to boot on OVMF if hyperv enlightenments and multicore are enabled. For full details see comment 7 on this bug. https://bugs.launchpad.net/qemu/+bug/1593605

This repo got a prebuilt 64-bit version of OVMF with the patch needed to make hyperv work.

--- a/OvmfPkg/QemuVideoDxe/VbeShim.c
+++ b/OvmfPkg/QemuVideoDxe/VbeShim.c
@@ -87,7 +87,7 @@ InstallVbeShim (
   //
   Segment0Pages = 1;
   Int0x10       = (IVT_ENTRY *)(UINTN)Segment0 + 0x10;
-  Status = gBS->AllocatePages (AllocateAddress, EfiBootServicesCode,
+  Status = gBS->AllocatePages (AllocateAddress, EfiACPIMemoryNVS,
                   Segment0Pages, &Segment0);

   if (EFI_ERROR (Status)) {

Patch was applied and built from tianocore git repo on 170207. https://github.com/tianocore/edk2/tree/master/OvmfPkg