On Mon, May 05, 2025 at 08:44:26PM +0800, Huang, Kai wrote:

On Fri, 2025-05-02 at 16:08 +0300, Kirill A. Shutemov wrote:

quoted

+static int tdx_pamt_add(atomic_t *pamt_refcount, unsigned long hpa,
+			struct list_head *pamt_pages)
+{
+	u64 err;
+
+	hpa = ALIGN_DOWN(hpa, SZ_2M);
+
+	spin_lock(&pamt_lock);

Just curious, Can the lock be per-2M-range?

Me too.
Could we introduce smaller locks each covering a 2M range?

And could we deposit 2 pamt pages per-2M hpa range no matter if it's finally
mapped as a huge page or not?