HV: regarding the use of cpuid’s 32bits register #8605
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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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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: #8605 Reviewed-by: Junjie Mao <[email protected]> Signed-off-by: andi6 <[email protected]>
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Describe the bug
In HV, cpuid uses the lower 32 bits of rax 、rbx、rcx and 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，will cause bugs。
Platform
guest: nuttx
HV: acrn 3.1
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