Re: [PATCH] KVM: vmx: add mismatched size in vmcs_check32

[Paolo Bonzini]

On 08/04/21 18:05, Sean Christopherson wrote:
>    Add compile-time assertions in vmcs_check32() to disallow accesses to
>    64-bit and 64-bit high fields via vmcs_{read,write}32().  Upper level
>    KVM code should never do partial accesses to VMCS fields.  KVM handles
>    the split accesses automatically in vmcs_{read,write}64() when running
>    as a 32-bit kernel.

KVM also uses raw vmread/vmwrite (__vmcs_readl/__vmcs_writel) when 
copying to and from the shadow VMCS, so that path will not go through 
vmcs_check32 either.

Paolo