[PATCH 18/20] KVM: Plan obsolescence of kernel allocated slots, paravirt mmu

Avi Kivity
2010-02-17T13:45:28Z

These features are unused by modern userspace and can go away. Paravirt
mmu needs to stay a little longer for live migration.

Signed-off-by: Avi Kivity <avi@redhat.com>
---
Documentation/feature-removal-schedule.txt | 30 ++++++++++++++++++++++++++++
1 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 0a46833..47a6554 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -542,3 +542,33 @@ Why: Duplicate functionality with the gspca_zc3xx driver, zc0301 only
sensors) wich are also supported by the gspca_zc3xx driver
(which supports 53 USB-ID's in total)
Who: Hans de Goede <hdegoede@redhat.com>
+
+----------------------------
+
+What: KVM memory aliases support
+When: July 2010
+Why: Memory aliasing support is used for speeding up guest vga access
+ through the vga windows.
+
+ Modern userspace no longer uses this feature, so it's just bitrotted
+ code and can be removed with no impact.
+Who: Avi Kivity <avi@redhat.com>
+
+----------------------------
+
+What: KVM kernel-allocated memory slots
+When: July 2010
+Why: Since 2.6.25, kvm supports user-allocated memory slots, which are
+ much more flexible than kernel-allocated slots. All current userspace
+ supports the newer interface and this code can be removed with no
+ impact.
+Who: Avi Kivity <avi@redhat.com>
+
+----------------------------
+
+What: KVM paravirt mmu host support
+When: January 2011
+Why: The paravirt mmu host support is slower than non-paravirt mmu, both
+ on newer and older hardware. It is already not exposed to the guest,
+ and kept only for live migration purposes.
+Who: Avi Kivity <avi@redhat.com>
--
1.6.5.3