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From: <yezengruan@huawei.com>
To: <yezengruan@huawei.com>, <linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<kvmarm@lists.cs.columbia.edu>, <kvm@vger.kernel.org>,
	<linux-doc@vger.kernel.org>,
	<virtualization@lists.linux-foundation.org>
Cc: <maz@kernel.org>, <james.morse@arm.com>, <linux@armlinux.org.uk>,
	<suzuki.poulose@arm.com>, <julien.thierry.kdev@gmail.com>,
	<catalin.marinas@arm.com>, <mark.rutland@arm.com>,
	<will@kernel.org>, <steven.price@arm.com>,
	<daniel.lezcano@linaro.org>
Subject: [PATCH 1/5] KVM: arm64: Document PV-lock interface
Date: Tue, 17 Dec 2019 21:55:45 +0800
Message-ID: <20191217135549.3240-2-yezengruan@huawei.com> (raw)
In-Reply-To: <20191217135549.3240-1-yezengruan@huawei.com>

From: Zengruan Ye <yezengruan@huawei.com>

Introduce a paravirtualization interface for KVM/arm64 to obtain the vcpu
is currently running or not.

A hypercall interface is provided for the guest to interrogate the
hypervisor's support for this interface and the location of the shared
memory structures.

Signed-off-by: Zengruan Ye <yezengruan@huawei.com>
---
 Documentation/virt/kvm/arm/pvlock.rst | 31 +++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 Documentation/virt/kvm/arm/pvlock.rst

diff --git a/Documentation/virt/kvm/arm/pvlock.rst b/Documentation/virt/kvm/arm/pvlock.rst
new file mode 100644
index 000000000000..eec0c36edf17
--- /dev/null
+++ b/Documentation/virt/kvm/arm/pvlock.rst
@@ -0,0 +1,31 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Paravirtualized lock support for arm64
+======================================
+
+KVM/arm64 provids some hypervisor service calls to support a paravirtualized
+guest obtaining the vcpu is currently running or not.
+
+Two new SMCCC compatible hypercalls are defined:
+
+* PV_LOCK_FEATURES:   0xC5000040
+* PV_LOCK_PREEMPTED:  0xC5000041
+
+The existence of the PV_LOCK hypercall should be probed using the SMCCC 1.1
+ARCH_FEATURES mechanism before calling it.
+
+PV_LOCK_FEATURES
+    ============= ========    ==========
+    Function ID:  (uint32)    0xC5000040
+    PV_call_id:   (uint32)    The function to query for support.
+    Return value: (int64)     NOT_SUPPORTED (-1) or SUCCESS (0) if the relevant
+                              PV-lock feature is supported by the hypervisor.
+    ============= ========    ==========
+
+PV_LOCK_PREEMPTED
+    ============= ========    ==========
+    Function ID:  (uint32)    0xC5000041
+    Return value: (int64)     NOT_SUPPORTED (-1) or SUCCESS (0) if the IPA of
+                              this vcpu's pv data structure is configured by
+                              the hypervisor.
+    ============= ========    ==========
-- 
2.19.1



  reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-17 13:55 [PATCH 0/5] KVM: arm64: vcpu preempted check support yezengruan
2019-12-17 13:55 ` yezengruan [this message]
2019-12-17 14:21   ` [PATCH 1/5] KVM: arm64: Document PV-lock interface Steven Price
2019-12-19 11:45     ` yezengruan
2019-12-20 11:43       ` Steven Price
2019-12-20 14:32   ` Markus Elfring
2019-12-23  2:06     ` yezengruan
2019-12-17 13:55 ` [PATCH 2/5] KVM: arm64: Implement PV_LOCK_FEATURES call yezengruan
2019-12-17 14:28   ` Steven Price
2019-12-19 11:59     ` yezengruan
2019-12-17 13:55 ` [PATCH 3/5] KVM: arm64: Support pvlock preempted via shared structure yezengruan
2019-12-17 14:33   ` Steven Price
2019-12-26  8:33     ` yezengruan
2019-12-17 13:55 ` [PATCH 4/5] KVM: arm64: Add interface to support vcpu preempted check yezengruan
2019-12-17 13:55 ` [PATCH 5/5] KVM: arm64: Support the vcpu preemption check yezengruan
2019-12-17 14:40   ` Steven Price
2019-12-26  8:34     ` yezengruan

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