[PATCH v6 1/6] x86/tdx: Take the Quote buffer as a generic pointer

[Peter Fang <peter.fang@intel.com>]

tdx_hcall_get_quote() takes a "u8 *" buffer unnecessarily. It is never
used as such, since only the buffer's memory address matters.

Accept a "void *" buffer instead. This avoids a cast to "u8 *" when a
later change gives the guest driver's Quote buffer an explicit type.

AI was used under supervision to collect/apply feedback, review code and
workshop logs.

Signed-off-by: Peter Fang <peter.fang@intel.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
v6:
 - No code changes.
 - Explain the connection to the explicit Quote buffer type. [Rick]
 - Add Sathya's Reviewed-by.
v5:
 - New patch. Prepare for a typed Quote buffer. [Dave]
---
 arch/x86/coco/tdx/tdx.c    | 2 +-
 arch/x86/include/asm/tdx.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
index a38e44401840..92c243851171 100644
--- a/arch/x86/coco/tdx/tdx.c
+++ b/arch/x86/coco/tdx/tdx.c
@@ -191,7 +191,7 @@ EXPORT_SYMBOL_FOR_MODULES(tdx_mcall_extend_rtmr, "tdx-guest");
  *
  * Return 0 on success or error code on failure.
  */
-u64 tdx_hcall_get_quote(u8 *buf, size_t size)
+u64 tdx_hcall_get_quote(void *buf, size_t size)
 {
 	/* Since buf is a shared memory, set the shared (decrypted) bits */
 	return _tdx_hypercall(TDVMCALL_GET_QUOTE, cc_mkdec(virt_to_phys(buf)), size, 0, 0);
diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h
index e186dfe5bf88..97bf6c8e0d89 100644
--- a/arch/x86/include/asm/tdx.h
+++ b/arch/x86/include/asm/tdx.h
@@ -82,7 +82,7 @@ int tdx_mcall_get_report0(u8 *reportdata, u8 *tdreport);
 
 int tdx_mcall_extend_rtmr(u8 index, u8 *data);
 
-u64 tdx_hcall_get_quote(u8 *buf, size_t size);
+u64 tdx_hcall_get_quote(void *buf, size_t size);
 
 void __init tdx_dump_attributes(u64 td_attr);
 void __init tdx_dump_td_ctls(u64 td_ctls);
-- 
2.53.0