On 17/02/21 19:43, Maxim Levitsky wrote:
1. npt/ept disabled in the host. In this case we have a single shadowing
and a nested hypervisor has to do its own shadowing on top of it.
In this case the MMU itself has to generate page faults (they are a result
of hardware page faults, but are completel
On Wed, 2021-02-17 at 18:37 +0100, Paolo Bonzini wrote:
> On 17/02/21 18:29, Sean Christopherson wrote:
> > All that being said, I'm pretty we can eliminate setting
> > inject_page_fault dynamically. I think that would yield more
> > maintainable code. Following these flows is a nightmare. The ch
On Wed, 2021-02-17 at 09:29 -0800, Sean Christopherson wrote:
> On Wed, Feb 17, 2021, Maxim Levitsky wrote:
> > This fixes a (mostly theoretical) bug which can happen if ept=0
> > on host and we run a nested guest which triggers a mmu context
> > reset while running nested.
> > In this case the .in
On 17/02/21 18:57, Sean Christopherson wrote:
That said, I'm also rusty on_why_ this code is needed. Why isn't it enough
to inject the exception normally, and let nested_vmx_check_exception decide
whether to inject a vmexit to L1 or an exception into L2?
Hmm, I suspect it was required at one
On Wed, Feb 17, 2021, Paolo Bonzini wrote:
> On 17/02/21 18:29, Sean Christopherson wrote:
> > All that being said, I'm pretty we can eliminate setting
> > inject_page_fault dynamically. I think that would yield more
> > maintainable code. Following these flows is a nightmare. The change
> > itself
On 17/02/21 18:29, Sean Christopherson wrote:
All that being said, I'm pretty we can eliminate setting
inject_page_fault dynamically. I think that would yield more
maintainable code. Following these flows is a nightmare. The change
itself will be scarier, but I'm pretty sure the end result will
On Wed, Feb 17, 2021, Maxim Levitsky wrote:
> This fixes a (mostly theoretical) bug which can happen if ept=0
> on host and we run a nested guest which triggers a mmu context
> reset while running nested.
> In this case the .inject_page_fault callback will be lost.
>
> Signed-off-by: Maxim Levitsky
This fixes a (mostly theoretical) bug which can happen if ept=0
on host and we run a nested guest which triggers a mmu context
reset while running nested.
In this case the .inject_page_fault callback will be lost.
Signed-off-by: Maxim Levitsky
---
arch/x86/kvm/vmx/nested.c | 8 +---
arch/x86
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