linux-kernel - [PATCH v2 06/17] kvm: arm/arm64: Fix stage2_flush

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1522156531-28348-7-git-send-email-suzuki.poulose@arm.com>
Date:   Tue, 27 Mar 2018 14:15:16 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, cdall@...nel.org, marc.zyngier@....com,
        punit.agrawal@....com, will.deacon@....com,
        catalin.marinas@....com, pbonzini@...hat.com, rkrcmar@...hat.com,
        ard.biesheuvel@...aro.org, peter.maydell@...aro.org,
        kristina.martsenko@....com, mark.rutland@....com,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH v2 06/17] kvm: arm/arm64: Fix stage2_flush_memslot for 4 level page table

So far we have only supported 3 level page table with fixed IPA of 40bits.
Fix stage2_flush_memslot() to accommodate for 4 level tables.

Cc: Marc Zyngier <marc.zyngier@....com>
Acked-by: Christoffer Dall <cdall@...nel.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 virt/kvm/arm/mmu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index ec62d1c..16a19fb 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -375,7 +375,8 @@ static void stage2_flush_memslot(struct kvm *kvm,
 	pgd = kvm->arch.pgd + stage2_pgd_index(addr);
 	do {
 		next = stage2_pgd_addr_end(addr, end);
-		stage2_flush_puds(kvm, pgd, addr, next);
+		if (!stage2_pgd_none(*pgd))
+			stage2_flush_puds(kvm, pgd, addr, next);
 	} while (pgd++, addr = next, addr != end);
 }
 
-- 
2.7.4