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From: Quentin Perret <qperret@google.com>
To: maz@kernel.org, james.morse@arm.com, alexandru.elisei@arm.com,
	 suzuki.poulose@arm.com, catalin.marinas@arm.com,
	will@kernel.org
Cc: qwandor@google.com, linux-kernel@vger.kernel.org,
	kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org, kernel-team@android.com
Subject: [PATCH 05/14] KVM: arm64: Don't overwrite ignored bits with owner id
Date: Mon, 19 Jul 2021 11:47:26 +0100	[thread overview]
Message-ID: <20210719104735.3681732-6-qperret@google.com> (raw)
In-Reply-To: <20210719104735.3681732-1-qperret@google.com>

The nVHE protected mode uses invalid mappings in the host stage-2
page-table to track the owner of each page in the system. In order to
allow the usage of ignored bits (a.k.a. software bits) in these
mappings, move the owner encoding away from the top bits.

Signed-off-by: Quentin Perret <qperret@google.com>
---
 arch/arm64/kvm/hyp/pgtable.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index a60653cbd8e5..a0ac8c2bc174 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -50,7 +50,7 @@
 					 KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W | \
 					 KVM_PTE_LEAF_ATTR_HI_S2_XN)
 
-#define KVM_INVALID_PTE_OWNER_MASK	GENMASK(63, 56)
+#define KVM_INVALID_PTE_OWNER_MASK	GENMASK(9, 2)
 #define KVM_MAX_OWNER_ID		1
 
 struct kvm_pgtable_walk_data {
-- 
2.32.0.402.g57bb445576-goog

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  parent reply	other threads:[~2021-07-19 10:47 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-19 10:47 [PATCH 00/14] Track shared pages at EL2 in protected mode Quentin Perret
2021-07-19 10:47 ` [PATCH 01/14] KVM: arm64: Provide the host_stage2_try() helper macro Quentin Perret
2021-07-20 13:57   ` Fuad Tabba
2021-07-19 10:47 ` [PATCH 02/14] KVM: arm64: Optimize kvm_pgtable_stage2_find_range() Quentin Perret
2021-07-19 10:47 ` [PATCH 03/14] KVM: arm64: Continue stage-2 map when re-creating mappings Quentin Perret
2021-07-19 12:14   ` Marc Zyngier
2021-07-19 13:32     ` Quentin Perret
2021-07-20  8:26       ` Marc Zyngier
2021-07-20 11:56         ` Quentin Perret
2021-07-19 10:47 ` [PATCH 04/14] KVM: arm64: Rename KVM_PTE_LEAF_ATTR_S2_IGNORED Quentin Perret
2021-07-19 10:47 ` Quentin Perret [this message]
2021-07-19 12:55   ` [PATCH 05/14] KVM: arm64: Don't overwrite ignored bits with owner id Marc Zyngier
2021-07-19 13:39     ` Quentin Perret
2021-07-20  8:46       ` Marc Zyngier
2021-07-19 10:47 ` [PATCH 06/14] KVM: arm64: Tolerate re-creating hyp mappings to set ignored bits Quentin Perret
2021-07-20 10:17   ` Fuad Tabba
2021-07-20 10:30     ` Quentin Perret
2021-07-20 10:59       ` Fuad Tabba
2021-07-20 11:14         ` Quentin Perret
2021-07-19 10:47 ` [PATCH 07/14] KVM: arm64: Enable forcing page-level stage-2 mappings Quentin Perret
2021-07-19 14:24   ` Marc Zyngier
2021-07-19 15:36     ` Quentin Perret
2021-07-19 10:47 ` [PATCH 08/14] KVM: arm64: Add support for tagging shared pages in page-table Quentin Perret
2021-07-19 14:43   ` Marc Zyngier
2021-07-19 15:49     ` Quentin Perret
2021-07-20 10:13       ` Marc Zyngier
2021-07-20 11:48         ` Quentin Perret
2021-07-20 13:48   ` Fuad Tabba
2021-07-20 14:06     ` Quentin Perret
2021-07-21  7:34       ` Fuad Tabba
2021-07-19 10:47 ` [PATCH 09/14] KVM: arm64: Mark host bss and rodata section as shared Quentin Perret
2021-07-19 15:01   ` Marc Zyngier
2021-07-19 15:56     ` Quentin Perret
2021-07-19 10:47 ` [PATCH 10/14] KVM: arm64: Enable retrieving protections attributes of PTEs Quentin Perret
2021-07-19 10:47 ` [PATCH 11/14] KVM: arm64: Expose kvm_pte_valid() helper Quentin Perret
2021-07-21  8:20   ` Fuad Tabba
2021-07-19 10:47 ` [PATCH 12/14] KVM: arm64: Refactor pkvm_pgtable locking Quentin Perret
2021-07-21  8:37   ` Fuad Tabba
2021-07-19 10:47 ` [PATCH 13/14] KVM: arm64: Restrict hyp stage-1 manipulation in protected mode Quentin Perret
2021-07-21 10:45   ` Fuad Tabba
2021-07-21 13:35     ` Quentin Perret
2021-07-19 10:47 ` [PATCH 14/14] KVM: arm64: Prevent late calls to __pkvm_create_private_mapping() Quentin Perret

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