linux-kernel - [PATCH] x86/mm/ptdump: display page encryption state

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Date:   Tue, 19 Apr 2022 17:35:45 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Mike Rapoport <rppt@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] x86/mm/ptdump: display page encryption state

From: Mike Rapoport <rppt@...ux.ibm.com>

When memory encryption is enabled, for instance in SEV guest, it is useful
to see what memory ranges are mapped as encrypted in the kernel page tables
and what ranges are left plain.

Add printing of 'ENC' for the encrypted ranges to the page table dumps.

Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
---
 arch/x86/mm/dump_pagetables.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index e1b599ecbbc2..187dd17b8780 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -201,6 +201,10 @@ static void printk_prot(struct seq_file *m, pgprotval_t pr, int level, bool dmsg
 			pt_dump_cont_printf(m, dmsg, "PCD ");
 		else
 			pt_dump_cont_printf(m, dmsg, "    ");
+		if (pr & _PAGE_ENC)
+			pt_dump_cont_printf(m, dmsg, "ENC ");
+		else
+			pt_dump_cont_printf(m, dmsg, "    ");
 
 		/* Bit 7 has a different meaning on level 3 vs 4 */
 		if (level <= 3 && pr & _PAGE_PSE)

base-commit: b2d229d4ddb17db541098b83524d901257e93845
-- 
2.28.0