diff --git a/SOURCES/tuned-2.10.0-realtime-virtual-host-pin-only-vcpu-thread-to-isolated-pcpu.patch b/SOURCES/tuned-2.10.0-realtime-virtual-host-pin-only-vcpu-thread-to-isolated-pcpu.patch
new file mode 100644
index 0000000..4c02ba3
--- /dev/null
+++ b/SOURCES/tuned-2.10.0-realtime-virtual-host-pin-only-vcpu-thread-to-isolated-pcpu.patch
@@ -0,0 +1,70 @@
+From 4790e570ce0e41bde4e1866ed6e3cba723b5f4d8 Mon Sep 17 00:00:00 2001
+From: Marcelo Tosatti <mtosatti@redhat.com>
+Date: Wed, 4 Jul 2018 17:30:37 -0300
+Subject: [PATCH] realtime-virtual-host: pin only the vcpu thread to isolated
+ pCPU (v2)
+
+As noted in the bugzilla ticket
+
+https://bugzilla.redhat.com/show_bug.cgi?id=1554851
+
+The QEMU I/O thread can interrupt the time measurement
+of the timer. To avoid this problem, only
+pin the vCPU thread.
+
+Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
+Reviewed-and-Tested-by: Luiz Capitulino <lcapitulino@redhat.com>
+
+v2:
+   - Use unix sockets (Luiz)
+   - Proper numeric output (Luiz)
+---
+ profiles/realtime-virtual-host/script.sh | 31 ++++++++++++++++--------
+ 1 file changed, 21 insertions(+), 10 deletions(-)
+
+diff --git a/profiles/realtime-virtual-host/script.sh b/profiles/realtime-virtual-host/script.sh
+index 515d2547..32e962db 100755
+--- a/profiles/realtime-virtual-host/script.sh
++++ b/profiles/realtime-virtual-host/script.sh
+@@ -17,20 +17,31 @@ run_tsc_deadline_latency()
+ 
+     for i in `seq 1000 500 7000`; do
+         echo $i > $KVM_LAPIC_FILE
+-        chrt -f 1 taskset -c $1 $QEMU -enable-kvm -device pc-testdev \
++
++        unixpath=`mktemp`
++
++        chrt -f 1 $QEMU -S -enable-kvm -device pc-testdev \
+             -device isa-debug-exit,iobase=0xf4,iosize=0x4 \
+             -display none -serial stdio -device pci-testdev \
+             -kernel "$TSCDEADLINE_LATENCY"  \
+-            -cpu host | grep latency | cut -f 2 -d ":" > $dir/out
+-
+-	if [ ! -f $dir/out ]; then
+-	    die running $TSCDEADLINE_LATENCY failed
+-	fi
++            -cpu host \
++            -mon chardev=char0,mode=readline \
++            -chardev socket,id=char0,nowait,path=$unixpath,server | grep latency | cut -f 2 -d ":" > $dir/out &
++
++        sleep 1s
++        pidofvcpu=`echo "info cpus" | nc -U $unixpath | grep thread_id | cut -f 3 -d "=" | tr -d "\r"`
++        taskset -p -c $1 $pidofvcpu >/dev/null
++        echo "cont" | nc -U $unixpath >/dev/null
++        wait
++
++        if [ ! -f $dir/out ]; then
++             die running $TSCDEADLINE_LATENCY failed
++        fi
+ 
+-	tmp=$(wc -l $dir/out | awk '{ print $1 }')
+-	if [ $tmp -eq 0 ]; then
+-	    die running $TSCDEADLINE_LATENCY failed
+-	fi
++        tmp=$(wc -l $dir/out | awk '{ print $1 }')
++        if [ $tmp -eq 0 ]; then
++            die running $TSCDEADLINE_LATENCY failed
++        fi
+ 
+         A=0
+         while read l; do
diff --git a/SPECS/tuned.spec b/SPECS/tuned.spec
index abd0934..52487c7 100644
--- a/SPECS/tuned.spec
+++ b/SPECS/tuned.spec
@@ -7,7 +7,7 @@
 Summary: A dynamic adaptive system tuning daemon
 Name: tuned
 Version: 2.10.0
-Release: 6%{?prerel1}%{?dist}.3
+Release: 6%{?prerel1}%{?dist}.4
 License: GPLv2+
 Source: https://github.com/redhat-performance/%{name}/archive/v%{version}%{?prerel2}.tar.gz#/%{name}-%{version}%{?prerel2}.tar.gz
 URL: http://www.tuned-project.org/
@@ -26,6 +26,7 @@ Patch1: tuned-2.10.0-use-online-cpus.patch
 Patch2: tuned-2.10.0-realtime-virtual-enable-rt-entsk.patch
 Patch3: tuned-2.10.0-disable-ksm-once.patch
 Patch4: tuned-2.10.0-update-kvm-modprobe-file.patch
+Patch5: tuned-2.10.0-realtime-virtual-host-pin-only-vcpu-thread-to-isolated-pcpu.patch
 
 %description
 The tuned package contains a daemon that tunes system settings dynamically.
@@ -164,6 +165,8 @@ It can be also used to fine tune your system for specific scenarios.
 %patch2 -p1
 %patch3 -p1
 %patch4 -p1
+%patch5 -p1
+
 # workaround for https://bugzilla.redhat.com/show_bug.cgi?id=1626473
 chmod 0755 profiles/realtime-virtual-guest/script.sh
 
@@ -416,6 +419,10 @@ fi
 %{_mandir}/man7/tuned-profiles-compat.7*
 
 %changelog
+* Wed Jul 10 2019 Jaroslav Škarvada <jskarvad@redhat.com> - 2.10.0-6.4
+- realtime-virtual-host: pin only the vcpu thread to isolated pcpu
+  Resolves: rhbz#1728699
+
 * Tue Nov 27 2018 Jaroslav Škarvada <jskarvad@redhat.com> - 2.10.0-6.3
 - Reworked setup_kvm_mod_low_latency to count with kernel changes
   Resolves: rhbz#1653767