Drop old Xen EC2 patch. It is no longer needed per Matt Wilson

1 files changed, 0 insertions, 34 deletions

diff --git a/fix_xen_guest_on_old_EC2.patch b/fix_xen_guest_on_old_EC2.patch
deleted file mode 100644
index e86200295..000000000
--- a/fix_xen_guest_on_old_EC2.patch
+++ /dev/null
@@ -1,34 +0,0 @@
-
-Legacy hypervisors (RHEL 5.0 and RHEL 5.1) do not handle guest writes to
-cr4 gracefully. If a guest attempts to write a bit of cr4 that is
-unsupported, then the HV is so offended it crashes the domain. While
-later guest kernels (such as RHEL6) don't assume the HV supports all
-features, they do expect nicer responses. That assumption introduced
-code that probes whether or not xsave is supported early in the boot. So
-now when attempting to boot a RHEL6 guest on RHEL5.0 or RHEL5.1 an early
-crash will occur.
-
-This patch is quite obviously an undesirable hack. The real fix for this
-problem should be in the HV, and is, in later HVs. However, to support
-running on old HVs, RHEL6 can take this small change. No impact will
-occur for running on any RHEL HV (not even RHEL 5.5 supports xsave).
-There is only potential for guest performance loss on upstream Xen.
-
----
- arch/x86/xen/enlighten.c |    1 +
- 1 files changed, 1 insertions(+), 0 deletions(-)
-
-diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
-index 52f8e19..6db3d67 100644
---- a/arch/x86/xen/enlighten.c
-+++ b/arch/x86/xen/enlighten.c
-@@ -802,6 +802,7 @@ static void xen_write_cr4(unsigned long cr4)
- {
- 	cr4 &= ~X86_CR4_PGE;
- 	cr4 &= ~X86_CR4_PSE;
-+	cr4 &= ~X86_CR4_OSXSAVE;
- 
- 	native_write_cr4(cr4);
- }
--- 
-1.6.6.1