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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 8/9] SUPPORT.md: Move descriptions up before Status info
This turns all the things which were treated as caveats, but which
don't need to be footnoted in the matrix, into descriptions.
For the benefit of the support matrix generator, this patch (or a
version of it) should be backported to 4.10.
Signed-off-by: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
Release-acked-by: Juergen Gross <jgross@xxxxxxxx>
(cherry picked from commit 67b46e14cb943e27134e9c6d7b41b27bdd8c6ae9)
Merge conflicts resolved:
- x86/HVM: 4.11 talks about "Status, domU"
- x86/PVH: 4.11 mentions domO so heading is different too
- ARM: Heading in 4.11 says just "ARM", in 4.10 "ARM guest"
Signed-off-by: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
---
SUPPORT.md | 211 ++++++++++++++++++++++++++++++++-----------------------------
1 file changed, 110 insertions(+), 101 deletions(-)
diff --git a/SUPPORT.md b/SUPPORT.md
index 201e5a3..3429afb 100644
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -58,44 +58,44 @@ for the definitions of the support status levels etc.
### ARM/GICv3 ITS
- Status: Experimental
-
Extension to the GICv3 interrupt controller to support MSI.
+ Status: Experimental
+
## Guest Type
### x86/PV
- Status: Supported
-
Traditional Xen PV guest
No hardware requirements
-### x86/HVM
-
Status: Supported
+### x86/HVM
+
Fully virtualised guest using hardware virtualisation extensions
Requires hardware virtualisation support (Intel VMX / AMD SVM)
-### x86/PVH guest
-
Status: Supported
+### x86/PVH guest
+
PVH is a next-generation paravirtualized mode
designed to take advantage of hardware virtualization support when possible.
During development this was sometimes called HVMLite or PVHv2.
Requires hardware virtualisation support (Intel VMX / AMD SVM)
-### ARM guest
-
Status: Supported
+### ARM guest
+
ARM only has one guest type at the moment
+ Status: Supported
+
## Toolstack
### xl
@@ -104,12 +104,12 @@ ARM only has one guest type at the moment
### Direct-boot kernel image format
+Format which the toolstack accepts for direct-boot kernels
+
Supported, x86: bzImage, ELF
Supported, ARM32: zImage
Supported, ARM64: Image
-Format which the toolstack accepts for direct-boot kernels
-
### Dom0 init support for xl
Status, SysV: Supported
@@ -118,10 +118,10 @@ Format which the toolstack accepts for direct-boot kernels
### JSON output support for xl
- Status: Experimental
-
Output of information in machine-parseable JSON format
+ Status: Experimental
+
### Open vSwitch integration for xl
Status, Linux: Supported
@@ -154,17 +154,18 @@ Output of information in machine-parseable JSON format
### Hypervisor 'debug keys'
- Status: Supported, not security supported
-
These are functions triggered either from the host serial console,
or via the xl 'debug-keys' command,
which cause Xen to dump various hypervisor state to the console.
+ Status: Supported, not security supported
+
### Hypervisor synchronous console output (sync_console)
+Xen command-line flag to force synchronous console output.
+
Status: Supported, not security supported
-Xen command-line flag to force synchronous console output.
Useful for debugging, but not suitable for production environments
due to incurred overhead.
@@ -176,56 +177,54 @@ Debugger to debug ELF guests
### Soft-reset for PV guests
- Status: Supported
-
Soft-reset allows a new kernel to start 'from scratch' with a fresh VM state,
but with all the memory from the previous state of the VM intact.
This is primarily designed to allow "crash kernels",
which can do core dumps of memory to help with debugging in the event of a
crash.
-### xentrace
+ Status: Supported
- Status, x86: Supported
+### xentrace
Tool to capture Xen trace buffer data
-### gcov
+ Status, x86: Supported
- Status: Supported, Not security supported
+### gcov
Export hypervisor coverage data suitable for analysis by gcov or lcov.
+ Status: Supported, Not security supported
+
## Memory Management
### Dynamic memory control
- Status: Supported
-
Allows a guest to add or remove memory after boot-time.
This is typically done by a guest kernel agent known as a "balloon driver".
-### Populate-on-demand memory
+ Status: Supported
- Status, x86 HVM: Supported
+### Populate-on-demand memory
This is a mechanism that allows normal operating systems with only a balloon
driver
to boot with memory < maxmem.
-### Memory Sharing
+ Status, x86 HVM: Supported
- Status, x86 HVM: Expermental
+### Memory Sharing
Allow sharing of identical pages between guests
-### Memory Paging
+ Status, x86 HVM: Expermental
- Status, x86 HVM: Experimenal
+### Memory Paging
Allow pages belonging to guests to be paged to disk
-### Transcendent Memory
+ Status, x86 HVM: Experimenal
- Status: Experimental
+### Transcendent Memory
Transcendent Memory (tmem) allows the creation of hypervisor memory pools
which guests can use to store memory
@@ -233,96 +232,100 @@ rather than caching in its own memory or swapping to
disk.
Having these in the hypervisor
can allow more efficient aggregate use of memory across VMs.
-### Alternative p2m
+ Status: Experimental
- Status, x86 HVM: Tech Preview
- Status, ARM: Tech Preview
+### Alternative p2m
Allows external monitoring of hypervisor memory
by maintaining multiple physical to machine (p2m) memory mappings.
+ Status, x86 HVM: Tech Preview
+ Status, ARM: Tech Preview
+
## Resource Management
### CPU Pools
- Status: Supported
-
Groups physical cpus into distinct groups called "cpupools",
with each pool having the capability
of using different schedulers and scheduling properties.
-### Credit Scheduler
-
Status: Supported
+### Credit Scheduler
+
A weighted proportional fair share virtual CPU scheduler.
This is the default scheduler.
-### Credit2 Scheduler
-
Status: Supported
+### Credit2 Scheduler
+
A general purpose scheduler for Xen,
designed with particular focus on fairness, responsiveness, and scalability
-### RTDS based Scheduler
+ Status: Supported
- Status: Experimental
+### RTDS based Scheduler
A soft real-time CPU scheduler
built to provide guaranteed CPU capacity to guest VMs on SMP hosts
+ Status: Experimental
+
### ARINC653 Scheduler
+A periodically repeating fixed timeslice scheduler.
+
Status: Supported
-A periodically repeating fixed timeslice scheduler.
Currently only single-vcpu domains are supported.
### Null Scheduler
- Status: Experimental
-
A very simple, very static scheduling policy
that always schedules the same vCPU(s) on the same pCPU(s).
It is designed for maximum determinism and minimum overhead
on embedded platforms.
-### NUMA scheduler affinity
+ Status: Experimental
- Status, x86: Supported
+### NUMA scheduler affinity
Enables NUMA aware scheduling in Xen
+ Status, x86: Supported
+
## Scalability
### Super page support
- Status, x86 HVM/PVH, HAP: Supported
- Status, x86 HVM/PVH, Shadow, 2MiB: Supported
- Status, ARM: Supported
-
NB that this refers to the ability of guests
to have higher-level page table entries point directly to memory,
improving TLB performance.
On ARM, and on x86 in HAP mode,
the guest has whatever support is enabled by the hardware.
+
+This feature is independent
+of the ARM "page granularity" feature (see below).
+
+ Status, x86 HVM/PVH, HAP: Supported
+ Status, x86 HVM/PVH, Shadow, 2MiB: Supported
+ Status, ARM: Supported
+
On x86 in shadow mode, only 2MiB (L2) superpages are available;
furthermore, they do not have the performance characteristics
of hardware superpages.
-Also note is feature independent
-of the ARM "page granularity" feature (see below).
-
### x86/PVHVM
- Status: Supported
-
This is a useful label for a set of hypervisor features
which add paravirtualized functionality to HVM guests
for improved performance and scalability.
This includes exposing event channels to HVM guests.
+ Status: Supported
+
## High Availability and Fault Tolerance
### Remus Fault Tolerance
@@ -335,54 +338,54 @@ This includes exposing event channels to HVM guests.
### x86/vMCE
- Status: Supported
-
Forward Machine Check Exceptions to appropriate guests
+ Status: Supported
+
## Virtual driver support, guest side
### Blkfront
+Guest-side driver capable of speaking the Xen PV block protocol
+
Status, Linux: Supported
Status, FreeBSD: Supported, Security support external
Status, NetBSD: Supported, Security support external
Status, OpenBSD: Supported, Security support external
Status, Windows: Supported
-Guest-side driver capable of speaking the Xen PV block protocol
-
### Netfront
+Guest-side driver capable of speaking the Xen PV networking protocol
+
Status, Linux: Supported
Status, FreeBSD: Supported, Security support external
Status, NetBSD: Supported, Security support external
Status, OpenBSD: Supported, Security support external
Status, Windows: Supported
-Guest-side driver capable of speaking the Xen PV networking protocol
-
### PV Framebuffer (frontend)
- Status, Linux (xen-fbfront): Supported
-
Guest-side driver capable of speaking the Xen PV Framebuffer protocol
+ Status, Linux (xen-fbfront): Supported
+
### PV Console (frontend)
+Guest-side driver capable of speaking the Xen PV console protocol
+
Status, Linux (hvc_xen): Supported
Status, FreeBSD: Supported, Security support external
Status, NetBSD: Supported, Security support external
Status, Windows: Supported
-Guest-side driver capable of speaking the Xen PV console protocol
-
### PV keyboard (frontend)
- Status, Linux (xen-kbdfront): Supported
-
Guest-side driver capable of speaking the Xen PV keyboard protocol.
Note that the "keyboard protocol" includes mouse / pointer support as well.
+ Status, Linux (xen-kbdfront): Supported
+
### PV USB (frontend)
Status, Linux: Supported
@@ -396,22 +399,22 @@ there is currently no xl support.
### PV TPM (frontend)
- Status, Linux (xen-tpmfront): Tech Preview
-
Guest-side driver capable of speaking the Xen PV TPM protocol
-### PV 9pfs frontend
+ Status, Linux (xen-tpmfront): Tech Preview
- Status, Linux: Tech Preview
+### PV 9pfs frontend
Guest-side driver capable of speaking the Xen 9pfs protocol
-### PVCalls (frontend)
-
Status, Linux: Tech Preview
+### PVCalls (frontend)
+
Guest-side driver capable of making pv system calls
+ Status, Linux: Tech Preview
+
## Virtual device support, host side
For host-side virtual device support,
@@ -420,6 +423,8 @@ unless otherwise noted.
### Blkback
+Host-side implementations of the Xen PV block protocol.
+
Status, Linux (xen-blkback): Supported
Status, QEMU (xen_disk), raw format: Supported
Status, QEMU (xen_disk), qcow format: Supported
@@ -430,42 +435,41 @@ unless otherwise noted.
Status, Blktap2, raw format: Deprecated
Status, Blktap2, vhd format: Deprecated
-Host-side implementations of the Xen PV block protocol.
Backends only support raw format unless otherwise specified.
### Netback
+Host-side implementations of Xen PV network protocol
+
Status, Linux (xen-netback): Supported
Status, FreeBSD (netback): Supported, Security support external
Status, NetBSD (xennetback): Supported, Security support external
-Host-side implementations of Xen PV network protocol
-
### PV Framebuffer (backend)
- Status, QEMU: Supported
-
Host-side implementation of the Xen PV framebuffer protocol
-### PV Console (xenconsoled)
+ Status, QEMU: Supported
- Status: Supported
+### PV Console (xenconsoled)
Host-side implementation of the Xen PV console protocol
-### PV keyboard (backend)
+ Status: Supported
- Status, QEMU: Supported
+### PV keyboard (backend)
Host-side implementation of the Xen PV keyboard protocol.
Note that the "keyboard protocol" includes mouse / pointer support as well.
-### PV USB (backend)
-
Status, QEMU: Supported
+### PV USB (backend)
+
Host-side implementation of the Xen PV USB protocol
+ Status, QEMU: Supported
+
### PV SCSI protocol (backend)
Status, Linux: Experimental
@@ -496,11 +500,11 @@ but has no xl support.
### Driver Domains
- Status: Supported, with caveats
-
"Driver domains" means allowing non-Domain 0 domains
with access to physical devices to act as back-ends.
+ Status: Supported, with caveats
+
See the appropriate "Device Passthrough" section
for more information about security support.
@@ -550,13 +554,13 @@ with dom0, driver domains, stub domains, domUs, and so on.
### x86/Nested PV
- Status, x86 Xen HVM: Tech Preview
-
This means running a Xen hypervisor inside an HVM domain on a Xen system,
with support for PV L2 guests only
(i.e., hardware virtualization extensions not provided
to the guest).
+ Status, x86 Xen HVM: Tech Preview
+
This works, but has performance limitations
because the L1 dom0 can only access emulated L1 devices.
@@ -565,19 +569,19 @@ but nobody has reported on performance.
### x86/Nested HVM
- Status, x86 HVM: Experimental
-
This means providing hardware virtulization support to guest VMs
allowing, for instance, a nested Xen to support both PV and HVM guests.
It also implies support for other hypervisors,
such as KVM, Hyper-V, Bromium, and so on as guests.
-### vPMU
+ Status, x86 HVM: Experimental
- Status, x86: Supported, Not security supported
+### vPMU
Virtual Performance Management Unit for HVM guests
+ Status, x86: Supported, Not security supported
+
Disabled by default (enable with hypervisor command line option).
This feature is not security supported: see
http://xenbits.xen.org/xsa/advisory-163.html
@@ -622,7 +626,11 @@ No support for QEMU backends in a 16K or 64K domain.
## Virtual Hardware, QEMU
-These are devices available in HVM mode using a qemu devicemodel (the default).
+This section describes supported devices available in HVM mode using a
+qemu devicemodel (the default).
+
+ Status: Support scope restricted
+
Note that other devices are available but not security supported.
### x86/Emulated platform devices (QEMU):
@@ -672,9 +680,10 @@ See the section **Blkback** for image formats supported by
QEMU.
### x86/HVM iPXE
+Booting a guest via PXE.
+
Status: Supported, with caveats
-Booting a guest via PXE.
PXE inherently places full trust of the guest in the network,
and so should only be used
when the guest network is under the same administrative control
@@ -682,17 +691,17 @@ as the guest itself.
### x86/HVM BIOS
+Booting a guest via guest BIOS firmware
+
Status, SeaBIOS (qemu-xen): Supported
Status, ROMBIOS (qemu-xen-traditional): Supported
-Booting a guest via guest BIOS firmware
-
### x86/HVM OVMF
- Status, qemu-xen: Supported
-
OVMF firmware implements the UEFI boot protocol.
+ Status, qemu-xen: Supported
+
# Format and definitions
This file contains prose, and machine-readable fragments.
--
2.1.4
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