linux-kernel - [PATCH v2 10/16] KVM: arm64: Add some documentation for the MMIO guard feature

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Date:   Mon,  4 Oct 2021 18:48:43 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     will@...nel.org, qperret@...gle.com, dbrazdil@...gle.com,
        Steven Price <steven.price@....com>,
        Andrew Jones <drjones@...hat.com>,
        Fuad Tabba <tabba@...gle.com>,
        Srivatsa Vaddagiri <vatsa@...eaurora.org>,
        Shanker R Donthineni <sdonthineni@...dia.com>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        kernel-team@...roid.com
Subject: [PATCH v2 10/16] KVM: arm64: Add some documentation for the MMIO guard feature

Document the hypercalls user for the MMIO guard infrastructure.

Signed-off-by: Marc Zyngier <maz@...nel.org>
---
 Documentation/virt/kvm/arm/index.rst      |  1 +
 Documentation/virt/kvm/arm/mmio-guard.rst | 74 +++++++++++++++++++++++
 2 files changed, 75 insertions(+)
 create mode 100644 Documentation/virt/kvm/arm/mmio-guard.rst

diff --git a/Documentation/virt/kvm/arm/index.rst b/Documentation/virt/kvm/arm/index.rst
index 78a9b670aafe..e77a0ee2e2d4 100644
--- a/Documentation/virt/kvm/arm/index.rst
+++ b/Documentation/virt/kvm/arm/index.rst
@@ -11,3 +11,4 @@ ARM
    psci
    pvtime
    ptp_kvm
+   mmio-guard
diff --git a/Documentation/virt/kvm/arm/mmio-guard.rst b/Documentation/virt/kvm/arm/mmio-guard.rst
new file mode 100644
index 000000000000..8b3c852c5d92
--- /dev/null
+++ b/Documentation/virt/kvm/arm/mmio-guard.rst
@@ -0,0 +1,74 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==============
+KVM MMIO guard
+==============
+
+KVM implements device emulation by handling translation faults to any
+IPA range that is not contained in a memory slot. Such a translation
+fault is in most cases passed on to userspace (or in rare cases to the
+host kernel) with the address, size and possibly data of the access
+for emulation.
+
+Should the guest exit with an address that is not one that corresponds
+to an emulatable device, userspace may take measures that are not the
+most graceful as far as the guest is concerned (such as terminating it
+or delivering a fatal exception).
+
+There is also an element of trust: by forwarding the request to
+userspace, the kernel assumes that the guest trusts userspace to do
+the right thing.
+
+The KVM MMIO guard offers a way to mitigate this last point: a guest
+can request that only certain regions of the IPA space are valid as
+MMIO. Only these regions will be handled as an MMIO, and any other
+will result in an exception being delivered to the guest.
+
+This relies on a set of hypercalls defined in the KVM-specific range,
+using the HVC64 calling convention.
+
+* ARM_SMCCC_KVM_FUNC_MMIO_GUARD_INFO
+
+    ==============    ========    ================================
+    Function ID:      (uint32)    0xC6000002
+    Arguments:        none
+    Return Values:    (int64)     NOT_SUPPORTED(-1) on error, or
+                      (uint64)    Protection Granule (PG) size in
+                                  bytes (r0)
+    ==============    ========    ================================
+
+* ARM_SMCCC_KVM_FUNC_MMIO_GUARD_ENROLL
+
+    ==============    ========    ==============================
+    Function ID:      (uint32)    0xC6000003
+    Arguments:        none
+    Return Values:    (int64)     NOT_SUPPORTED(-1) on error, or
+                                  RET_SUCCESS(0) (r0)
+    ==============    ========    ==============================
+
+* ARM_SMCCC_KVM_FUNC_MMIO_GUARD_MAP
+
+    ==============    ========    ====================================
+    Function ID:      (uint32)    0xC6000004
+    Arguments:        (uint64)    The base of the PG-sized IPA range
+                                  that is allowed to be accessed as
+                                  MMIO. Must be aligned to the PG size
+                                  (r1)
+                      (uint64)    Index in the MAIR_EL1 register
+		                  providing the memory attribute that
+				  is used by the guest (r2)
+    Return Values:    (int64)     NOT_SUPPORTED(-1) on error, or
+                                  RET_SUCCESS(0) (r0)
+    ==============    ========    ====================================
+
+* ARM_SMCCC_KVM_FUNC_MMIO_GUARD_UNMAP
+
+    ==============    ========    ======================================
+    Function ID:      (uint32)    0xC6000005
+    Arguments:        (uint64)    PG-sized IPA range aligned to the PG
+                                  size which has been previously mapped.
+                                  Must be aligned to the PG size and
+                                  have been previously mapped (r1)
+    Return Values:    (int64)     NOT_SUPPORTED(-1) on error, or
+                                  RET_SUCCESS(0) (r0)
+    ==============    ========    ======================================
-- 
2.30.2