[Devel] [PATCH RHEL7 COMMIT] Revert "kvm/x86: clear hyperv synic pages only when guest modifies MSRs"

[Konstantin Khorenko]

The commit is pushed to "branch-rh7-3.10.0-693.1.1.vz7.37.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-693.1.1.vz7.37.11
------>
commit d47506f0735aa762368b077185272517bf0f3aec
Author: Roman Kagan <rkagan at virtuozzo.com>
Date:   Thu Oct 12 11:20:49 2017 +0300

    Revert "kvm/x86: clear hyperv synic pages only when guest modifies MSRs"
    
    This reverts commit d385b9f5e7a4c225b1463655484daeebb1ca79dd.
    It will be replaced by a backported mainstream commit with different
    behavior.
    
    Signed-off-by: Roman Kagan <rkagan at virtuozzo.com>
---
 arch/x86/kvm/hyperv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 58f3f22..ed7f0ad 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -219,7 +219,7 @@ static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
 		synic->version = data;
 		break;
 	case HV_X64_MSR_SIEFP:
-		if (data & HV_SYNIC_SIEFP_ENABLE && !host)
+		if (data & HV_SYNIC_SIEFP_ENABLE)
 			if (kvm_clear_guest(vcpu->kvm,
 					    data & PAGE_MASK, PAGE_SIZE)) {
 				ret = 1;
@@ -230,7 +230,7 @@ static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
 			synic_exit(synic, msr);
 		break;
 	case HV_X64_MSR_SIMP:
-		if (data & HV_SYNIC_SIMP_ENABLE && !host)
+		if (data & HV_SYNIC_SIMP_ENABLE)
 			if (kvm_clear_guest(vcpu->kvm,
 					    data & PAGE_MASK, PAGE_SIZE)) {
 				ret = 1;