Adding debian version 4.19.249-2.debian/4.19.249-2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/debian/patches-rt/0090-x86-kvm-Require-const-tsc-for-RT.patch b/debian/patches-rt/0090-x86-kvm-Require-const-tsc-for-RT.patch
new file mode 100644
index 000000000..f748cb9d8
--- /dev/null
+++ b/debian/patches-rt/0090-x86-kvm-Require-const-tsc-for-RT.patch
@@ -0,0 +1,37 @@
+From 53f33d36d7741754ec7b7f2e4a0c62faa30d6902 Mon Sep 17 00:00:00 2001
+From: Thomas Gleixner <tglx@linutronix.de>
+Date: Sun, 6 Nov 2011 12:26:18 +0100
+Subject: [PATCH 090/347] x86: kvm Require const tsc for RT
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz
+
+Non constant TSC is a nightmare on bare metal already, but with
+virtualization it becomes a complete disaster because the workarounds
+are horrible latency wise. That's also a preliminary for running RT in
+a guest on top of a RT host.
+
+Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+---
+ arch/x86/kvm/x86.c | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
+index 417abc9ba1ad..9829e0fbdd41 100644
+--- a/arch/x86/kvm/x86.c
++++ b/arch/x86/kvm/x86.c
+@@ -6875,6 +6875,13 @@ int kvm_arch_init(void *opaque)
+ 		goto out;
+ 	}
+ 
++#ifdef CONFIG_PREEMPT_RT_FULL
++	if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
++		printk(KERN_ERR "RT requires X86_FEATURE_CONSTANT_TSC\n");
++		return -EOPNOTSUPP;
++	}
++#endif
++
+ 	r = kvm_mmu_module_init();
+ 	if (r)
+ 		goto out_free_percpu;
+-- 
+2.36.1
+