Re: [PATCH v4 01/24] x86/virt/tdx: Move low level SEAMCALL helpers out of <asm/tdx.h>

[Chao Gao]

>-static __always_inline u64 sc_retry(sc_func_t func, u64 fn,
>-			   struct tdx_module_args *args)
>-{
>-	int retry = RDRAND_RETRY_LOOPS;
>-	u64 ret;
>-
>-	do {
>-		preempt_disable();
>-		ret = __seamcall_dirty_cache(func, fn, args);
>-		preempt_enable();

...

>-	} while (ret == TDX_RND_NO_ENTROPY && --retry);
>-
>-	return ret;
>-}
>-

<snip>

>+
>+static __always_inline u64 sc_retry(sc_func_t func, u64 fn,
>+			   struct tdx_module_args *args)
>+{
>+	int retry = RDRAND_RETRY_LOOPS;
>+	u64 ret;
>+
>+	do {
>+		ret = func(fn, args);

Here should be:

		preempt_disable();
		ret = __seamcall_dirty_cache(func, fn, args);
		preempt_enable();

This looks like a bug I introduced when resolving conflicts with

  commit 10df8607bf1a ("x86/virt/tdx: Mark memory cache state incoherent when making SEAMCALL")

Sorry for this issue. I will fix it in the next version.


>+	} while (ret == TDX_RND_NO_ENTROPY && --retry);
>+
>+	return ret;
>+}