Binbin Wu 2fd6e119ca hv: vmcall: hv should not change guest RAX vmcall is undefined ... HV passes the return value of vmcall by register RAX unconditionally. However, if the vmcall is undefined for a guest, RAX value of guest vcpu should not be changed. According to SDM Vol. 3C 30-9, VMCALL is allowed from any CPL in guest. VMCALL is NOT allowed from CPL > 0 in vmx root mode. ACRN hypervisor doesn't call VMCALL in vmx root mode, though. In current code, ACRN also deny VMCALL from CPL > 0 in guest. So for this case, #GP will not be injected, instead, modify the RAX to notify the return value. Tracked-On: #2405 Signed-off-by: Binbin Wu <binbin.wu@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>		2019-02-18 11:56:42 +08:00
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x86	hv: vmcall: hv should not change guest RAX vmcall is undefined	2019-02-18 11:56:42 +08:00