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[Xen-devel] [PATCH v4 2/6] SUPPORT.md: Add qemu-depriv section

Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxx>
Changes since v3:
- Moved from the qemu-depriv doc patches.
- Reword to include the possibility of having a non-dom0 "devicemodel"
  domain which may want to be protected
- Specify `Linux dom0` as the currently-tech-supported window

CC: Ian Jackson <ian.jackson@xxxxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: Jan Beulich <jbeulich@xxxxxxxx>
CC: Tim Deegan <tim@xxxxxxx>
CC: Konrad Wilk <konrad.wilk@xxxxxxxxxx>
CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
CC: Julien Grall <julien.grall@xxxxxxx>
CC: Anthony Perard <anthony.perard@xxxxxxxxxx>
CC: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
 SUPPORT.md | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/SUPPORT.md b/SUPPORT.md
index 4f203da84a..1f0f5857a7 100644
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -525,6 +525,26 @@ Vulnerabilities of a device model stub domain
 to a hostile driver domain (either compromised or untrusted)
 are excluded from security support.
+### Device Model Deprivileging
+    Status, Linux dom0: Tech Preview, with limited support
+This means adding extra restrictions to a device model in order to
+prevent a compromised device model from attack the rest of the domain
+it's running in (normally dom0).
+"Tech preview with limited support" means we will not issue XSAs for
+the _additional_ functionality provided by the feature; but we will
+issue XSAs in the event that enabling this feature opens up a security
+hole that would not be present without the feature disabled.
+For example, while this is classified as tech preview, a bug in libxl
+which failed to change the user ID of QEMU would not receive an XSA,
+since without this feature the user ID wouldn't be changed. But a
+change which made it possible for a compromised guest to read
+arbitrary files on the host filesystem without compromising QEMU would
+be issued an XSA, since that does weaken security.
 ### KCONFIG Expert
     Status: Experimental

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