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Message-ID: <20231018190626.445926-1-Ashish.Kalra@amd.com>
Date: Wed, 18 Oct 2023 19:06:26 +0000
From: Ashish Kalra <Ashish.Kalra@....com>
To: <dave.hansen@...ux.intel.com>, <luto@...nel.org>,
<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
<x86@...nel.org>, <hpa@...or.com>, <thomas.lendacky@....com>,
<linux-kernel@...r.kernel.org>, <peterz@...radead.org>
Subject: [PATCH v2] x86/mm: fix pg_level_to_pfn for 5-level paging mode.
From: Ashish Kalra <ashish.kalra@....com>
Add support for 5-level paging in pg_level_to_pfn().
This issue was found during working on SNP guest kexec support,
this helper function is used during early boot stage for setting
of C-bit on the PTEs and additionally need this same helper for
switching shared pages to private during guest kexec.
Signed-off-by: Ashish Kalra <ashish.kalra@....com>
---
arch/x86/mm/mem_encrypt_amd.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/x86/mm/mem_encrypt_amd.c b/arch/x86/mm/mem_encrypt_amd.c
index 6faea41e99b6..45914568596a 100644
--- a/arch/x86/mm/mem_encrypt_amd.c
+++ b/arch/x86/mm/mem_encrypt_amd.c
@@ -267,6 +267,10 @@ static unsigned long pg_level_to_pfn(int level, pte_t *kpte, pgprot_t *ret_prot)
pfn = pud_pfn(*(pud_t *)kpte);
prot = pud_pgprot(*(pud_t *)kpte);
break;
+ case PG_LEVEL_512G:
+ pfn = p4d_pfn(*(p4d_t *)kpte);
+ prot = p4d_pgprot(*(p4d_t *)kpte);
+ break;
default:
WARN_ONCE(1, "Invalid level for kpte\n");
return 0;
--
2.25.1
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