On Thu, Oct 22, 2020 at 04:59:49PM +, Edgecombe, Rick P wrote:
> On Thu, 2020-10-22 at 15:06 +0300, Kirill A. Shutemov wrote:
> > > I think the page could have got unmapped since the gup via the
> > > hypercall on another CPU. It could be an avenue for the guest to
> > > crash
> > > the host.
On Thu, 2020-10-22 at 15:06 +0300, Kirill A. Shutemov wrote:
> > I think the page could have got unmapped since the gup via the
> > hypercall on another CPU. It could be an avenue for the guest to
> > crash
> > the host.
>
> Hm.. I'm not sure I follow. Could you elaborate on what scenario you
>
On Thu, Oct 22, 2020 at 05:26:47AM +0200, Halil Pasic wrote:
> On Tue, 20 Oct 2020 09:18:57 +0300
> "Kirill A. Shutemov" wrote:
>
> > We cannot access protected pages directly. Use ioremap() to
> > create a temporary mapping of the page. The mapping is destroyed
> > on __kvm_unmap_gfn().
> >
>
On Wed, Oct 21, 2020 at 06:50:28PM +, Edgecombe, Rick P wrote:
> On Tue, 2020-10-20 at 09:18 +0300, Kirill A. Shutemov wrote:
> > @@ -467,7 +477,7 @@ void iounmap(volatile void __iomem *addr)
> > p = find_vm_area((void __force *)addr);
> >
> > if (!p) {
> > -
On Tue, 20 Oct 2020 09:18:57 +0300
"Kirill A. Shutemov" wrote:
> We cannot access protected pages directly. Use ioremap() to
> create a temporary mapping of the page. The mapping is destroyed
> on __kvm_unmap_gfn().
>
> The new interface gfn_to_pfn_memslot_protected() is used to detect if
> the
On Tue, 2020-10-20 at 09:18 +0300, Kirill A. Shutemov wrote:
> We cannot access protected pages directly. Use ioremap() to
> create a temporary mapping of the page. The mapping is destroyed
> on __kvm_unmap_gfn().
>
> The new interface gfn_to_pfn_memslot_protected() is used to detect if
> the
We cannot access protected pages directly. Use ioremap() to
create a temporary mapping of the page. The mapping is destroyed
on __kvm_unmap_gfn().
The new interface gfn_to_pfn_memslot_protected() is used to detect if
the page is protected.
ioremap_cache_force() is a hack to bypass
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