linux-kernel - Re: [RFC v2 05/32] x86/tdx: Add __tdcall() and _

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Date:   Tue, 27 Apr 2021 12:18:07 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Dave Hansen <dave.hansen@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Tony Luck <tony.luck@...el.com>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        Raj Ashok <ashok.raj@...el.com>,
        Sean Christopherson <seanjc@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC v2 05/32] x86/tdx: Add __tdcall() and __tdvmcall() helper
 functions

Hi Dave,

On 4/27/21 7:29 AM, Dave Hansen wrote:
>> Do we need to rename the helper functions ?
>>
>> tdvmcall(), tdvmcall_out_r11()
> Yes.
> 
>> Also what about output structs?
>>
>> struct tdcall_output
>> struct tdvmcall_output
> Yes, they need sane, straightforward names which are not confusing too.
> 

Following is the rename diff. Please let me know if you agree with the
names used.

diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h
index 6c3c71bb57a0..95a6a6c6061a 100644
--- a/arch/x86/include/asm/tdx.h
+++ b/arch/x86/include/asm/tdx.h

-struct tdcall_output {
+struct tdx_module_output {
         u64 rcx;
         u64 rdx;
         u64 r8;
@@ -19,7 +19,7 @@ struct tdcall_output {
         u64 r11;
  };

-struct tdvmcall_output {
+struct tdx_hypercall_output {
         u64 r11;
         u64 r12;
         u64 r13;
@@ -33,12 +33,12 @@ bool is_tdx_guest(void);
  void __init tdx_early_init(void);

  /* Helper function used to communicate with the TDX module */
-u64 __tdcall(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9,
-            struct tdcall_output *out);
+u64 __tdx_module_call(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9,
+                     struct tdx_module_output *out);

  /* Helper function used to request services from VMM */
-u64 __tdvmcall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15,
-              struct tdvmcall_output *out);
+u64 __tdx_hypercall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15,
+                   struct tdx_hypercall_output *out);

--- a/arch/x86/kernel/tdx.c
+++ b/arch/x86/kernel/tdx.c
@@ -8,11 +8,11 @@
  /*
   * Wrapper for use case that checks for error code and print warning message.
   */
-static inline u64 tdvmcall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15)
+static inline u64 tdx_hypercall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15)
  {
         u64 err;

-       err = __tdvmcall(fn, r12, r13, r14, r15, NULL);
+       err = __tdx_hypercall(fn, r12, r13, r14, r15, NULL);

         if (err)
                 pr_warn_ratelimited("TDVMCALL fn:%llx failed with err:%llx\n",
@@ -24,13 +24,14 @@ static inline u64 tdvmcall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15)
  /*
   * Wrapper for the semi-common case where we need single output value (R11).
   */
-static inline u64 tdvmcall_out_r11(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15)
+static inline u64 tdx_hypercall_out_r11(u64 fn, u64 r12, u64 r13,
+                                       u64 r14, u64 r15)


-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer