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hv: fix using cpuid does not clear the upper 32-bit registers. #8610

Merged
merged 1 commit into from
Jun 19, 2024
Merged

hv: fix using cpuid does not clear the upper 32-bit registers. #8610

merged 1 commit into from
Jun 19, 2024
+12 −13

Commits on May 29, 2024

  1. hv: fix using cpuid does not clear the upper 32-bit registers. 

    In HV, cpuid uses the lower 32 bits of rax\rbx\rcx\rdx registers to pass parameters,
But the software does not clear the upper 32-bit registers,  if the guest
uses 64-bit variables to pass parameters to cpuid，guest will use rax\rbx\rcx\rdx,
not eax\ebx\ecx\edx, the previous value of the high 32 registers will affect the guest.

Tracked-On: projectacrn#8605
Reviewed-by: Junjie Mao <[email protected]>
Signed-off-by: andi6 <[email protected]>
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    476997779 committed May 29, 2024
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