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OvmfPkg/XenHypercallLib: Enable it in PEIM

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Allow to use Xen hypercalls earlier, during the PEIM stage, but
XenHypercallLibInit() must be called once the XenInfo HOB is created
with the HyperPage setup.

Change the return value of XenHypercallLibInit so failure can be
detected when the call shouldn't fail, but still have the constructor
always succeed.

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1689
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20190813113119.14804-17-anthony.perard@citrix.com>
This commit is contained in:
Anthony PERARD
2019-08-13 12:31:00 +01:00
committed by Laszlo Ersek
parent 2a4a6242b7
commit 68f4599dfc
4 changed files with 31 additions and 9 deletions
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8
OvmfPkg/Library/XenHypercallLib/X86XenHypercall.c
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@@ -59,13 +59,7 @@ XenHypercallLibInit (
GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);
if (GuidHob == NULL) {
//
// We don't fail library construction, since that has catastrophic
// consequences for client modules (whereas those modules may easily be
// running on a non-Xen platform). Instead, XenHypercallIsAvailable() above
// will return FALSE.
//
return RETURN_SUCCESS;
return RETURN_NOT_FOUND;
}
XenInfo = (EFI_XEN_INFO *) GET_GUID_HOB_DATA (GuidHob);
HyperPage = XenInfo->HyperPages;