linux-kernel - [PATCHv2 2/7] x86/tdx: Add more registers to struct tdx_hypercall

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Date:   Thu, 12 Jan 2023 13:14:02 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Dave Hansen <dave.hansen@...el.com>,
        Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>
Cc:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Elena Reshetova <elena.reshetova@...el.com>, x86@...nel.org,
        linux-coco@...ts.linux.dev, linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv2 2/7] x86/tdx: Add more registers to struct tdx_hypercall_args

struct tdx_hypercall_args is used to pass down hypercall arguments to
__tdx_hypercall() assembly routine.

Currently __tdx_hypercall() handles up to 6 arguments. In preparation to
changes in __tdx_hypercall(), expand the structure to 6 more registers
and generate asm offsets for them.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 arch/x86/include/asm/shared/tdx.h | 6 ++++++
 arch/x86/kernel/asm-offsets.c     | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/arch/x86/include/asm/shared/tdx.h b/arch/x86/include/asm/shared/tdx.h
index e53f26228fbb..8068faa52de1 100644
--- a/arch/x86/include/asm/shared/tdx.h
+++ b/arch/x86/include/asm/shared/tdx.h
@@ -22,12 +22,18 @@
  * This is a software only structure and not part of the TDX module/VMM ABI.
  */
 struct tdx_hypercall_args {
+	u64 r8;
+	u64 r9;
 	u64 r10;
 	u64 r11;
 	u64 r12;
 	u64 r13;
 	u64 r14;
 	u64 r15;
+	u64 rdi;
+	u64 rsi;
+	u64 rbx;
+	u64 rdx;
 };
 
 /* Used to request services from the VMM */
diff --git a/arch/x86/kernel/asm-offsets.c b/arch/x86/kernel/asm-offsets.c
index 82c783da16a8..8650f29387e0 100644
--- a/arch/x86/kernel/asm-offsets.c
+++ b/arch/x86/kernel/asm-offsets.c
@@ -75,12 +75,18 @@ static void __used common(void)
 	OFFSET(TDX_MODULE_r11, tdx_module_output, r11);
 
 	BLANK();
+	OFFSET(TDX_HYPERCALL_r8,  tdx_hypercall_args, r8);
+	OFFSET(TDX_HYPERCALL_r9,  tdx_hypercall_args, r9);
 	OFFSET(TDX_HYPERCALL_r10, tdx_hypercall_args, r10);
 	OFFSET(TDX_HYPERCALL_r11, tdx_hypercall_args, r11);
 	OFFSET(TDX_HYPERCALL_r12, tdx_hypercall_args, r12);
 	OFFSET(TDX_HYPERCALL_r13, tdx_hypercall_args, r13);
 	OFFSET(TDX_HYPERCALL_r14, tdx_hypercall_args, r14);
 	OFFSET(TDX_HYPERCALL_r15, tdx_hypercall_args, r15);
+	OFFSET(TDX_HYPERCALL_rdi, tdx_hypercall_args, rdi);
+	OFFSET(TDX_HYPERCALL_rsi, tdx_hypercall_args, rsi);
+	OFFSET(TDX_HYPERCALL_rbx, tdx_hypercall_args, rbx);
+	OFFSET(TDX_HYPERCALL_rdx, tdx_hypercall_args, rdx);
 
 	BLANK();
 	OFFSET(BP_scratch, boot_params, scratch);
-- 
2.38.2