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: linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
ardb@kernel.org, qwandor@google.com, tabba@google.com,
dbrazdil@google.com, kernel-team@android.com,
Quentin Perret <qperret@google.com>
Subject: [PATCH v2 10/16] KVM: arm64: Add helpers to tag shared pages in SW bits
Date: Mon, 26 Jul 2021 10:28:59 +0100 [thread overview]
Message-ID: <20210726092905.2198501-11-qperret@google.com> (raw)
In-Reply-To: <20210726092905.2198501-1-qperret@google.com>
We will soon start annotating shared pages in page-tables in nVHE
protected mode. Define all the states in which a page can be (owned,
shared and owned, shared and borrowed), and provide helpers allowing to
convert this into SW bits annotations using the matching prot
attributes.
Signed-off-by: Quentin Perret <qperret@google.com>
---
arch/arm64/kvm/hyp/include/nvhe/mem_protect.h | 27 +++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
index 9c227d87c36d..facbd9a7ab99 100644
--- a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
+++ b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
@@ -12,6 +12,33 @@
#include <asm/virt.h>
#include <nvhe/spinlock.h>
+/*
+ * SW bits 0-1 are reserved to track the memory ownership state of each page:
+ * 00: The page is owned solely by the page-table owner.
+ * 01: The page is owned by the page-table owner, but is shared
+ * with another entity.
+ * 10: The page is shared with, but not owned by the page-table owner.
+ * 11: Reserved for future use (lending).
+ */
+enum pkvm_page_state
+{
+ PKVM_PAGE_OWNED = 0ULL,
+ PKVM_PAGE_SHARED_OWNED = KVM_PGTABLE_PROT_SW0,
+ PKVM_PAGE_SHARED_BORROWED = KVM_PGTABLE_PROT_SW1,
+};
+
+#define PKVM_PAGE_STATE_PROT_MASK (KVM_PGTABLE_PROT_SW0 | KVM_PGTABLE_PROT_SW1)
+static inline enum kvm_pgtable_prot pkvm_mkstate(enum kvm_pgtable_prot prot,
+ enum pkvm_page_state state)
+{
+ return (prot & ~PKVM_PAGE_STATE_PROT_MASK) | state;
+}
+
+static inline enum pkvm_page_state pkvm_getstate(enum kvm_pgtable_prot prot)
+{
+ return prot & PKVM_PAGE_STATE_PROT_MASK;
+}
+
struct host_kvm {
struct kvm_arch arch;
struct kvm_pgtable pgt;
--
2.32.0.432.gabb21c7263-goog
next prev parent reply other threads:[~2021-07-26 9:29 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-26 9:28 [PATCH v2 00/16] Track shared pages at EL2 in protected mode Quentin Perret
2021-07-26 9:28 ` [PATCH v2 01/16] KVM: arm64: Introduce helper to retrieve a PTE and its level Quentin Perret
2021-07-26 9:28 ` [PATCH v2 02/16] KVM: arm64: Provide the host_stage2_try() helper macro Quentin Perret
2021-07-26 9:28 ` [PATCH v2 03/16] KVM: arm64: Expose page-table helpers Quentin Perret
2021-07-26 9:28 ` [PATCH v2 04/16] KVM: arm64: Optimize host memory aborts Quentin Perret
2021-07-26 10:35 ` Marc Zyngier
2021-07-26 13:13 ` Quentin Perret
2021-07-26 13:24 ` Marc Zyngier
2021-07-26 9:28 ` [PATCH v2 05/16] KVM: arm64: Rename KVM_PTE_LEAF_ATTR_S2_IGNORED Quentin Perret
2021-07-26 9:28 ` [PATCH v2 06/16] KVM: arm64: Don't overwrite software bits with owner id Quentin Perret
2021-07-26 9:28 ` [PATCH v2 07/16] KVM: arm64: Tolerate re-creating hyp mappings to set software bits Quentin Perret
2021-07-26 9:28 ` [PATCH v2 08/16] KVM: arm64: Enable forcing page-level stage-2 mappings Quentin Perret
2021-07-26 9:28 ` [PATCH v2 09/16] KVM: arm64: Allow populating software bits Quentin Perret
2021-07-26 9:28 ` Quentin Perret [this message]
2021-07-26 9:29 ` [PATCH v2 11/16] KVM: arm64: Introduce and export host_stage2_idmap_locked() Quentin Perret
2021-07-26 9:29 ` [PATCH v2 12/16] KVM: arm64: Mark host bss and rodata section as shared Quentin Perret
2021-07-28 12:14 ` Quentin Perret
2021-07-26 9:29 ` [PATCH v2 13/16] KVM: arm64: Enable retrieving protections attributes of PTEs Quentin Perret
2021-07-26 9:29 ` [PATCH v2 14/16] KVM: arm64: Refactor protected nVHE stage-1 locking Quentin Perret
2021-07-26 9:29 ` [PATCH v2 15/16] KVM: arm64: Restrict EL2 stage-1 changes in protected mode Quentin Perret
2021-07-26 11:27 ` Marc Zyngier
2021-07-26 12:55 ` Quentin Perret
2021-07-26 9:29 ` [PATCH v2 16/16] KVM: arm64: Make __pkvm_create_mappings static Quentin Perret
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