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MsvmPkg/PlatformPei: Skip DMA pinning detection when Hv is disabled #95

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Merged
jstarks merged 1 commit into from
Jul 21, 2026
Merged

MsvmPkg/PlatformPei: Skip DMA pinning detection when Hv is disabled #95

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12 changes: 12 additions & 0 deletions MsvmPkg/PlatformPei/Hv.c
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
#include <Hv/HvGuestCpuid.h>
#include <Library/DebugLib.h>
#include <Library/CrashDumpAgentLib.h>
#include <Library/PcdLib.h>
#include <Library/HvHypercallLib.h>
#include "MsCpuid.h"
#include "StaticAssert1.h"
Expand Down Expand Up @@ -175,6 +176,17 @@ Return Value:
{
EFI_STATUS status;

//
// When Hyper-V is disabled (e.g. the loader reported a Generic platform via
// the SEC platform type PPI) no hypervisor is present to service hypercalls.
// Issuing one here during PEI - before the exception vectors are installed -
// hard hangs the system, so skip the detection entirely.
//
if (!PcdGetBool(PcdHvEnabled))
{
return;
}

#if defined(MDE_CPU_X64)

HV_CPUID_RESULT cpuidResult;
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