linux-kernel - [PATCH v7 2/5] x86/mm: Enhance sme_populate

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Message-Id: <1536616151-16738-3-git-send-email-brijesh.singh@amd.com>
Date:   Mon, 10 Sep 2018 16:49:08 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Brijesh Singh <brijesh.singh@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...e.de>, "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Subject: [PATCH v7 2/5] x86/mm: Enhance sme_populate_pgd() to update page flags

Enhance sme_populate_pgd() to update page flags if the PMD/PTE entry
already exists.

Signed-off-by: Brijesh Singh <brijesh.singh@....com>
Reviewed-by: Tom Lendacky <thomas.lendacky@....com>
Reviewed-by: Borislav Petkov <bp@...e.de>
Fixes: 6ebcb060713f ("x86/mm: Add support to encrypt the kernel in-place")
Cc: Tom Lendacky <thomas.lendacky@....com>
Cc: kvm@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Borislav Petkov <bp@...e.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: linux-kernel@...r.kernel.org
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Sean Christopherson <sean.j.christopherson@...el.com>
Cc: "Radim Krčmář" <rkrcmar@...hat.com>
---
 arch/x86/mm/mem_encrypt_identity.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/arch/x86/mm/mem_encrypt_identity.c b/arch/x86/mm/mem_encrypt_identity.c
index f488d46..2b245af 100644
--- a/arch/x86/mm/mem_encrypt_identity.c
+++ b/arch/x86/mm/mem_encrypt_identity.c
@@ -155,9 +155,6 @@ static void __init sme_populate_pgd_large(struct sme_populate_pgd_data *ppd)
 		return;
 
 	pmd = pmd_offset(pud, ppd->vaddr);
-	if (pmd_large(*pmd))
-		return;
-
 	set_pmd(pmd, __pmd(ppd->paddr | ppd->pmd_flags));
 }
 
@@ -183,8 +180,7 @@ static void __init sme_populate_pgd(struct sme_populate_pgd_data *ppd)
 		return;
 
 	pte = pte_offset_map(pmd, ppd->vaddr);
-	if (pte_none(*pte))
-		set_pte(pte, __pte(ppd->paddr | ppd->pte_flags));
+	set_pte(pte, __pte(ppd->paddr | ppd->pte_flags));
 }
 
 static void __init __sme_map_range_pmd(struct sme_populate_pgd_data *ppd)
-- 
2.7.4