Hi,
Cheers for these discussion. :)
I am on vacation, and will come back at 2.18.
Thanks,
Keqian
On 21-02-07 18:40:36, Keqian Zhu wrote:
> Hi Yi,
>
> On 2021/2/7 17:56, Yi Sun wrote:
> > Hi,
> >
> > On 21-01-28 23:17:41, Keqian Zhu wrote:
> >
> > [...]
> >
> >> +static void vfio_dma_dirty_log_s
On Thursday 04 Feb 2021 at 10:47:08 (+), Quentin Perret wrote:
> On Wednesday 03 Feb 2021 at 14:37:10 (+), Will Deacon wrote:
> > > +static void handle___pkvm_init(struct kvm_cpu_context *host_ctxt)
> > > +{
> > > + DECLARE_REG(phys_addr_t, phys, host_ctxt, 1);
> > > + DECLARE_REG(unsigned
On 21-02-09 11:16:08, Robin Murphy wrote:
> On 2021-02-07 09:56, Yi Sun wrote:
> >Hi,
> >
> >On 21-01-28 23:17:41, Keqian Zhu wrote:
> >
> >[...]
> >
> >>+static void vfio_dma_dirty_log_start(struct vfio_iommu *iommu,
> >>+struct vfio_dma *dma)
> >>+{
> >>+ struct
On 21-02-07 18:40:36, Keqian Zhu wrote:
> Hi Yi,
>
> On 2021/2/7 17:56, Yi Sun wrote:
> > Hi,
> >
> > On 21-01-28 23:17:41, Keqian Zhu wrote:
> >
> > [...]
> >
> >> +static void vfio_dma_dirty_log_start(struct vfio_iommu *iommu,
> >> + struct vfio_dma *dma)
> >> +{
On Tue, Feb 09, 2021 at 10:00:29AM +, Quentin Perret wrote:
> On Thursday 04 Feb 2021 at 10:47:08 (+), Quentin Perret wrote:
> > On Wednesday 03 Feb 2021 at 14:37:10 (+), Will Deacon wrote:
> > > > +static void handle___pkvm_init(struct kvm_cpu_context *host_ctxt)
> > > > +{
> > > > +
On 2021-02-09 11:57, Yi Sun wrote:
On 21-02-07 18:40:36, Keqian Zhu wrote:
Hi Yi,
On 2021/2/7 17:56, Yi Sun wrote:
Hi,
On 21-01-28 23:17:41, Keqian Zhu wrote:
[...]
+static void vfio_dma_dirty_log_start(struct vfio_iommu *iommu,
+struct vfio_dma *dma)
+{
When running under a nesting hypervisor, it isn't guaranteed that
the virtual HW will include a PMU. In which case, let's not try
to access the PMU registers in the world switch, as that'd be
deadly.
Reported-by: Andre Przywara
Signed-off-by: Marc Zyngier
---
arch/arm64/kernel/image-vars.h
Yet another PMU bug that is only likely to hit under Nested Virt: we
unconditionally access PMU registers without checking whether it
actually is present.
Given that we already have a predicate for this, promote it to a
static key, and use that in the world switch.
Thanks to Andre for the heads u
We currently find out about the presence of a HW PMU (or the handling
of that PMU by perf, which amounts to the same thing) in a fairly
roundabout way, by checking the number of counters available to perf.
That's good enough for now, but we will soon need to find about about
that on paths where per
On 2021-02-07 09:56, Yi Sun wrote:
Hi,
On 21-01-28 23:17:41, Keqian Zhu wrote:
[...]
+static void vfio_dma_dirty_log_start(struct vfio_iommu *iommu,
+struct vfio_dma *dma)
+{
+ struct vfio_domain *d;
+
+ list_for_each_entry(d, &iommu->domain_lis
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