On Wed, Nov 16, 2022 at 03:08:49AM +, Marc Zyngier wrote:
> I'm not crazy about this sort of parameters. I think it would make a
> lot more sense to pass a pointer to the walker structure and do the
> flag check inside the helper.
>
> That way, we avoid extra churn if/when we need extra state
On Sun, Nov 13, 2022 at 8:38 AM Marc Zyngier wrote:
>
> Ricardo recently pointed out that the PMU chained counter emulation
> in KVM wasn't quite behaving like the one on actual hardware, in
> the sense that a chained counter would expose an overflow on
> both halves of a chained counter, while
On Tue, 15 Nov 2022 22:55:02 +,
Oliver Upton wrote:
>
> Marek reported a BUG resulting from the recent parallel faults changes,
> as the hyp stage-1 map walker attempted to allocate table memory while
> holding the RCU read lock:
>
> BUG: sleeping function called from invalid context at
>
On Tue, Nov 15, 2022, Huang, Kai wrote:
> On Wed, 2022-11-02 at 23:19 +, Sean Christopherson wrote:
> > +static bool __init kvm_is_vmx_supported(void)
> > +{
> > + if (!cpu_has_vmx()) {
> > + pr_err("CPU doesn't support VMX\n");
> > + return false;
> > + }
> > +
> > +
On Wed, 2022-11-02 at 23:18 +, Sean Christopherson wrote:
> Acquire a new mutex, vendor_module_lock, in kvm_x86_vendor_init() while
> doing hardware setup to ensure that concurrent calls are fully serialized.
> KVM rejects attempts to load vendor modules if a different module has
> already
On Tue, Nov 15, 2022 at 03:27:18PM -0800, Ricardo Koller wrote:
> On Tue, Nov 15, 2022 at 03:03:42PM -0800, Ricardo Koller wrote:
> > On Mon, Nov 14, 2022 at 08:54:52PM +, Oliver Upton wrote:
[...]
> > > > diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
> > > > index
On Tue, Nov 15, 2022 at 03:03:42PM -0800, Ricardo Koller wrote:
> On Mon, Nov 14, 2022 at 08:54:52PM +, Oliver Upton wrote:
> > Hi Ricardo,
> >
> > On Sat, Nov 12, 2022 at 08:17:06AM +, Ricardo Koller wrote:
> >
> > [...]
> >
> > > +/**
> > > + * kvm_pgtable_stage2_split() - Split a
On Mon, Nov 14, 2022 at 08:54:52PM +, Oliver Upton wrote:
> Hi Ricardo,
>
> On Sat, Nov 12, 2022 at 08:17:06AM +, Ricardo Koller wrote:
>
> [...]
>
> > +/**
> > + * kvm_pgtable_stage2_split() - Split a range of huge pages into leaf PTEs
> > pointing
> > + * to
Marek reported a BUG resulting from the recent parallel faults changes,
as the hyp stage-1 map walker attempted to allocate table memory while
holding the RCU read lock:
BUG: sleeping function called from invalid context at
include/linux/sched/mm.h:274
in_atomic(): 0, irqs_disabled(): 0,
On Wed, 2022-11-02 at 23:19 +, Sean Christopherson wrote:
> +static bool __init kvm_is_vmx_supported(void)
> +{
> + if (!cpu_has_vmx()) {
> + pr_err("CPU doesn't support VMX\n");
> + return false;
> + }
> +
> + if
On Tue, Nov 15, 2022, Sean Christopherson wrote:
> On Thu, Nov 10, 2022, Huang, Kai wrote:
> > On Thu, 2022-11-10 at 01:33 +, Huang, Kai wrote:
> > > > @@ -9283,7 +9283,13 @@ static int
> > > > kvm_x86_check_processor_compatibility(struct kvm_x86_init_ops *ops)
> > > > int cpu =
On Thu, Nov 10, 2022, Huang, Kai wrote:
> On Thu, 2022-11-10 at 01:33 +, Huang, Kai wrote:
> > > @@ -9283,7 +9283,13 @@ static int
> > > kvm_x86_check_processor_compatibility(struct kvm_x86_init_ops *ops)
> > > int cpu = smp_processor_id();
> > > struct cpuinfo_x86 *c = _data(cpu);
> > >
On Tue, Nov 15, 2022 at 10:47:37AM -0800, Ricardo Koller wrote:
> On Wed, Nov 09, 2022 at 11:55:31PM +, Oliver Upton wrote:
> > On Wed, Nov 09, 2022 at 09:53:45PM +, Sean Christopherson wrote:
> > > On Mon, Nov 07, 2022, Oliver Upton wrote:
> > > > Use RCU to safely walk the stage-2 page
On Wed, Nov 09, 2022 at 11:55:31PM +, Oliver Upton wrote:
> On Wed, Nov 09, 2022 at 09:53:45PM +, Sean Christopherson wrote:
> > On Mon, Nov 07, 2022, Oliver Upton wrote:
> > > Use RCU to safely walk the stage-2 page tables in parallel. Acquire and
> > > release the RCU read lock when
Hey Will,
On Tue, Nov 15, 2022 at 01:25:34PM +, Will Deacon wrote:
[...]
> On Mon, Nov 14, 2022 at 08:11:27PM +, Oliver Upton wrote:
> > +int kvm_pgtable_hyp_walk(struct kvm_pgtable *pgt, u64 addr, u64 size,
> > +struct kvm_pgtable_walker *walker);
>
> Hmm, this
On Mon, Nov 14, 2022 at 08:11:27PM +, Oliver Upton wrote:
> A subsequent change to the page table walkers adds RCU protection for
> walking stage-2 page tables. KVM uses a global lock to serialize hyp
> stage-1 walks, meaning RCU protection is quite meaningless for
> protecting hyp stage-1
Sean Christopherson writes:
> On Thu, Nov 03, 2022, Vitaly Kuznetsov wrote:
>> Sean Christopherson writes:
>> > + /*
>> > + * Reset everything to support using non-enlightened VMCS access later
>> > + * (e.g. when we reload the module with enlightened_vmcs=0)
>> > + */
>> > +
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