linux-kernel - [PATCH 2/3] Documentation/ppc: Add ppc hypercall documentation

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Date:	Tue, 07 Aug 2012 13:10:26 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Rob Landley <rob@...dley.net>, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org
Cc:	Alexander Graf <agraf@...e.de>,
	Randy Dunlap <rdunlap@...otime.net>,
	"H. Peter Anvin" <hpa@...or.com>, KVM <kvm@...r.kernel.org>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Avi Kivity <avi@...hat.com>, Gleb Natapov <gleb@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Thomas Gleixner <tglx@...utronix.de>, X86 <x86@...nel.org>
Subject: [PATCH 2/3] Documentation/ppc: Add ppc hypercall documentation

From: Alexander Graf <agraf@...e.de>

Signed-off-by: Alexander Graf <agraf@...e.de>
Signed-off-by: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
---

 Documentation/virtual/kvm/ppc-pv.txt |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/Documentation/virtual/kvm/ppc-pv.txt b/Documentation/virtual/kvm/ppc-pv.txt
index 4911cf9..4cd076f 100644
--- a/Documentation/virtual/kvm/ppc-pv.txt
+++ b/Documentation/virtual/kvm/ppc-pv.txt
@@ -174,3 +174,25 @@ following:
 That way we can inject an arbitrary amount of code as replacement for a single
 instruction. This allows us to check for pending interrupts when setting EE=1
 for example.
+
+Hypercall ABIs in KVM on PowerPC
+=================================
+1) KVM hypercalls (ePAPR)
+
+These are ePAPR compliant hypercall implementation (mentioned above). Even
+generic hypercalls are implemented here, like the ePAPR idle hcall. These are
+available on all targets.
+
+2) PAPR hypercalls
+
+PAPR hypercalls are needed to run server PowerPC PAPR guests (-M pseries in QEMU).
+These are the same hypercalls that pHyp, the POWER hypervisor implements. Some of
+them are handled in the kernel, some are handled in user space. This is only
+available on book3s_64.
+
+3) OSI hypercalls
+
+Mac-on-Linux is another user of KVM on PowerPC, which has its own hypercall (long
+before KVM). This is supported to maintain compatibility. All these hypercalls get
+forwarded to user space. This is only useful on book3s_32, but can be used with
+book3s_64 as well.

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