Marcelo, My latest QEMU patch ([PATCH V5] target-i386: Enabling IA32_TSC_ADJUST for QEMU KVM guest VMs) seems to be OK with regards to reset. The tsc_adjust variable is being zeroed by the memset() in x86_cpu_reset(). Later code seems to write these values through kvm_put_msr() by way of cpu_synchronize_all_post_reset().
Andreas said: I'm expecting this to go through Marcello's queue unless I'm told otherwise. Does this meet your expectations as well? Thanks, Will > -----Original Message----- > From: Marcelo Tosatti [mailto:mtosa...@redhat.com] > Sent: Thursday, November 29, 2012 12:44 PM > To: Auld, Will > Cc: k...@vger.kernel.org; Dugger, Donald D; Liu, Jinsong; Zhang, > Xiantao; a...@redhat.com; qemu-devel; Gleb > Subject: Re: [PATCH V5 2/2] Enabling IA32_TSC_ADJUST for KVM guest VM > support > > On Thu, Nov 29, 2012 at 07:21:28PM +0000, Auld, Will wrote: > > Marcelo, > > > > The behavior on reset is to return the TSC_AJUST msr value to 0x0. I > am currently initializing this emulated msr in kvm_arch_vcpu_init(). > > Will, > > Reset is handled by QEMU. kvm_arch_vcpu_init is only called during vcpu > allocation (ie vm creation). See x86_cpu_reset in QEMU's target- > i386/cpu.c file. > > > > > >- Behaviour on reset: what is the behaviour on RESET? > > > > I am testing the rebase now. I would like to get any needed changes > for this initialization into my next patch set version (v6) if > possible. > > For the kernel patch, everything is fine. Apparently for the QEMU patch > it is necessary to set value to zero on reset.
