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The Service VM communicates with the hypervisor via conventional hypercalls. VMCALL instruction is used to make the hypercalls. ACRN hypercall ABI: * Hypercall number is in R8 register. * Up to 2 parameters are in RDI and RSI registers. * Return value is in RAX register. Introduce the ACRN hypercall interfaces. Because GCC doesn't support R8 register as direct register constraints, use supported constraint as input with a explicit MOV to R8 in beginning of asm. Cc: Dave Hansen <dave.hansen@intel.com> Cc: Sean Christopherson <sean.j.christopherson@intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Fengwei Yin <fengwei.yin@intel.com> Cc: Zhi Wang <zhi.a.wang@intel.com> Cc: Zhenyu Wang <zhenyuw@linux.intel.com> Cc: Yu Wang <yu1.wang@intel.com> Cc: Reinette Chatre <reinette.chatre@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Arvind Sankar <nivedita@alum.mit.edu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: Segher Boessenkool <segher@kernel.crashing.org> Originally-by: Yakui Zhao <yakui.zhao@intel.com> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Acked-by: Borislav Petkov <bp@suse.de> Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Link: https://lore.kernel.org/r/20210207031040.49576-5-shuo.a.liu@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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