90f5ecd37f
Now the TDX_HYPERCALL asm is basically identical to the TDX_MODULE_CALL with both '\saved' and '\ret' enabled, with two minor things though: 1) The way to restore the structure pointer is different The TDX_HYPERCALL uses RCX as spare to restore the structure pointer, but the TDX_MODULE_CALL assumes no spare register can be used. In other words, TDX_MODULE_CALL already covers what TDX_HYPERCALL does. 2) TDX_MODULE_CALL only clears shared registers for TDH.VP.ENTER For this just need to make that code available for the non-host case. Thus, remove the TDX_HYPERCALL and reimplement the __tdx_hypercall() using the TDX_MODULE_CALL. Extend the TDX_MODULE_CALL to cover "clear shared registers" for TDG.VP.VMCALL. Introduce a new __tdcall_saved_ret() to replace the temporary __tdcall_hypercall(). The __tdcall_saved_ret() can also be used for those new TDCALLs which require more input/output registers than the basic TDCALLs do. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Kai Huang <kai.huang@intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/all/e68a2473fb6f5bcd78b078cae7510e9d0753b3df.1692096753.git.kai.huang%40intel.com
63 lines
1.8 KiB
ArmAsm
63 lines
1.8 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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#include <asm/asm-offsets.h>
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#include <asm/asm.h>
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#include <linux/linkage.h>
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#include <linux/errno.h>
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#include "../../virt/vmx/tdx/tdxcall.S"
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.section .noinstr.text, "ax"
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/*
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* __tdcall() - Used by TDX guests to request services from the TDX
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* module (does not include VMM services) using TDCALL instruction.
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*
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* __tdcall() function ABI:
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*
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* @fn (RDI) - TDCALL Leaf ID, moved to RAX
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* @args (RSI) - struct tdx_module_args for input
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*
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* Only RCX/RDX/R8-R11 are used as input registers.
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*
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* Return status of TDCALL via RAX.
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*/
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SYM_FUNC_START(__tdcall)
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TDX_MODULE_CALL host=0
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SYM_FUNC_END(__tdcall)
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/*
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* __tdcall_ret() - Used by TDX guests to request services from the TDX
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* module (does not include VMM services) using TDCALL instruction, with
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* saving output registers to the 'struct tdx_module_args' used as input.
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*
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* __tdcall_ret() function ABI:
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*
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* @fn (RDI) - TDCALL Leaf ID, moved to RAX
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* @args (RSI) - struct tdx_module_args for input and output
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*
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* Only RCX/RDX/R8-R11 are used as input/output registers.
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*
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* Return status of TDCALL via RAX.
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*/
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SYM_FUNC_START(__tdcall_ret)
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TDX_MODULE_CALL host=0 ret=1
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SYM_FUNC_END(__tdcall_ret)
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/*
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* __tdcall_saved_ret() - Used by TDX guests to request services from the
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* TDX module (including VMM services) using TDCALL instruction, with
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* saving output registers to the 'struct tdx_module_args' used as input.
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*
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* __tdcall_saved_ret() function ABI:
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*
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* @fn (RDI) - TDCALL leaf ID, moved to RAX
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* @args (RSI) - struct tdx_module_args for input/output
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*
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* All registers in @args are used as input/output registers.
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*
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* On successful completion, return the hypercall error code.
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*/
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SYM_FUNC_START(__tdcall_saved_ret)
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TDX_MODULE_CALL host=0 ret=1 saved=1
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SYM_FUNC_END(__tdcall_saved_ret)
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