[PATCH v3 05/10] x86/tdx: Avoid crossing the page boundary

[Alexey Gladkov]

From: "Alexey Gladkov (Intel)" <legion@xxxxxxxxxx>

Try to avoid crossing the page boundary to avoid side effects if the
next page belongs to another VMA.

Signed-off-by: Alexey Gladkov (Intel) <legion@xxxxxxxxxx>
---
 arch/x86/coco/tdx/tdx.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
index 254d5293d25a..e3d692342603 100644
--- a/arch/x86/coco/tdx/tdx.c
+++ b/arch/x86/coco/tdx/tdx.c
@@ -489,13 +489,10 @@ static int decode_insn_struct(struct insn *insn, struct pt_regs *regs)
 	char buffer[MAX_INSN_SIZE];
 
 	if (user_mode(regs)) {
-		int nr_copied = insn_fetch_from_user(regs, buffer);
+		int ret = insn_fetch_decode_from_user(insn, regs);
 
-		if (nr_copied <= 0)
-			return -EFAULT;
-
-		if (!insn_decode_from_regs(insn, regs, buffer, nr_copied))
-			return -EINVAL;
+		if (ret)
+			return ret;
 	} else {
 		if (copy_from_kernel_nofault(buffer, (void *)regs->ip, MAX_INSN_SIZE))
 			return -EFAULT;
-- 
2.45.2