[PATCH v2 13/31] x86/virt/tdx: Extend tdx_clflush_page() to handle compound pages

[Xu Yilun <yilun.xu@linux.intel.com>]

Use page_size() to correctly flush the range that a compound page
covers.

Recall that TDX Module requires VMM to provide IOMMU metadata known as
IOMMU_MT, which contains some multi-order pages. Like all other
metadata, TDX Module will convert these multi-order pages to private so
VMM should flush the shared cache beforehand. Extend tdx_clflush_page()
to handle this case.

The usage of tdx_clflush_page() for IOMMU_MT will be introduced later,
but the change stands as a valid improvement on its own.

Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>
---
 arch/x86/virt/vmx/tdx/tdx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c
index 0e1ad793e648..e7d47fbe7057 100644
--- a/arch/x86/virt/vmx/tdx/tdx.c
+++ b/arch/x86/virt/vmx/tdx/tdx.c
@@ -1510,7 +1510,7 @@ static int init_tdmrs(struct tdmr_info_list *tdmr_list)
  */
 static void tdx_clflush_page(struct page *page)
 {
-	clflush_cache_range(page_to_virt(page), PAGE_SIZE);
+	clflush_cache_range(page_to_virt(page), page_size(page));
 }
 
 static void tdx_clflush_page_array(struct tdx_page_array *array)
-- 
2.25.1