Control: tags -1 + pending Hi Aurelien,
On Fri, Sep 23, 2016 at 01:58:51PM +0200, Aurelien Jarno wrote: > Source: linux > Version: 3.16.36-1+deb8u1 > Severity: normal > Tags: patch > User: [email protected] > Usertags: needed-by-DSA-Team > > Dear Maintainer, > > The following fix went to kernel 3.16.7-ckt25-1, as it was Cc:ed to > [email protected]: > > | commit 9dbe6cf941a6fe82933aef565e4095fb10f65023 > | Author: Paolo Bonzini <[email protected]> > | Date: Thu Nov 12 14:49:17 2015 +0100 > | > | KVM: x86: expose MSR_TSC_AUX to userspace > | > | If we do not do this, it is not properly saved and restored across > | migration. Windows notices due to its self-protection mechanisms, > | and is very upset about it (blue screen of death). > | > | Cc: Radim Krcmar <[email protected]> > | Cc: [email protected] > | Signed-off-by: Paolo Bonzini <[email protected]> > > However it has been followed a bit later by the following fix, which has > not been Cc:ed to [email protected] and thus not backported: > > | commit 81b1b9ca6d5ca5f3ce91c0095402def657cf5db3 > | Author: Haozhong Zhang <[email protected]> > | Date: Mon Dec 14 23:13:38 2015 +0800 > | > | KVM: VMX: Fix host initiated access to guest MSR_TSC_AUX > | > | The current handling of accesses to guest MSR_TSC_AUX returns error if > | vcpu does not support rdtscp, though those accesses are initiated by > | host. This can result in the reboot failure of some versions of > | QEMU. This patch fixes this issue by passing those host initiated > | accesses for further handling instead. > | > | Signed-off-by: Haozhong Zhang <[email protected]> > | Signed-off-by: Paolo Bonzini <[email protected]> > > This causes guest migrations issues when the host supports the rdtscp > instruction, but it is not exposed to the guest. The migration itself > works fine, but then the guest is frozen on the target host. > > This patch does not apply cleanly to the 3.16 kernel, but can be > backported relatively easily. It has already been backported in > v4.2.8-ckt5 already, so the patch can be taken from there directly. I have pushed the patch in the jessie branch in git. Regards, Salvatore
