Changeset 107026 in vbox for trunk/src/VBox/VMM/VMMR3/NEMR3Native-linux-armv8.cpp

Timestamp:

Nov 18, 2024 2:21:58 PM (2 months ago)

Author:

vboxsync

Message:

VMM/NEM/ARM: Loading a 32-bit value into a register clears the upper half on real hardware, workaround for ldp instruction accessing the TPM MMIO area caused by tpm.sys in a Windows 11/ARM guest, bugref:10777

File:

• trunk/src/VBox/VMM/VMMR3/NEMR3Native-linux-armv8.cpp (modified) (1 diff)

trunk/src/VBox/VMM/VMMR3/NEMR3Native-linux-armv8.cpp

@@ -555 +555 @@
         pVCpu->cpum.GstCtx.aGRegs[uReg].x = fSignExtend ? (int64_t)u64Val : u64Val;
     else
-        pVCpu->cpum.GstCtx.aGRegs[uReg].w = fSignExtend ? (int32_t)u64Val : u64Val; /** @todo Does this clear the upper half on real hardware? */
+        pVCpu->cpum.GstCtx.aGRegs[uReg].x = (uint64_t)(fSignExtend ? (int32_t)u64Val : (uint32_t)u64Val);
 
     /* Mark the register as not extern anymore. */