Re: [V2 PATCH 0/6] KVM: selftests: selftests for fd-based private memory

[Sean Christopherson]

On Wed, Jan 18, 2023, Kirill A. Shutemov wrote:
> On Wed, Jan 18, 2023 at 01:09:49AM +0000, Sean Christopherson wrote:
> > On Mon, Dec 05, 2022, Vishal Annapurve wrote:
> > > This series implements selftests targeting the feature floated by Chao via:
> > > https://lore.kernel.org/lkml/20221202061347.1070246-10-chao.p.peng@xxxxxxxxxxxxxxx/T/
> > > 
> > > Below changes aim to test the fd based approach for guest private memory
> > > in context of normal (non-confidential) VMs executing on non-confidential
> > > platforms.
> > > 
> > > private_mem_test.c file adds selftest to access private memory from the
> > > guest via private/shared accesses and checking if the contents can be
> > > leaked to/accessed by vmm via shared memory view before/after conversions.
> > > 
> > > Updates in V2:
> > > 1) Simplified vcpu run loop implementation API
> > > 2) Removed VM creation logic from private mem library
> > 
> > I pushed a rework version of this series to:
> > 
> >   git@xxxxxxxxxx:sean-jc/linux.git x86/upm_base_support
> 
> It still has build issue with lockdep enabled that I mentioned before:

Yeah, I haven't updated the branch since last Friday, i.e. I haven't fixed the
known bugs yet.  I pushed the selftests changes at the same as everything else,
just didn't get to typing up the emails until yesterday.

> https://lore.kernel.org/all/20230116134845.vboraky2nd56szos@xxxxxxxxxxxxxxxxx/
> 
> And when compiled with lockdep, it triggers a lot of warnings about missed
> locks, like this:

Ah crud, I knew I was forgetting something.  The lockdep assertion can simply be
removed, mmu_lock doesn't need to be held to read attributes.  I knew the assertion
was wrong when I added it, but I wanted to remind myself to take a closer look at
the usage of kvm_mem_is_private() and forgot to go back and delete the assertion.

The use of kvm_mem_is_private() in kvm_mmu_do_page_fault() is technically unsafe.
Similar to getting the pfn, if mmu_lock isn't held, consuming the attributes
(private vs. shared) needs MMU notifier protection, i.e. the attributes are safe
to read only after mmu_invalidate_seq is snapshot.

However, is_private gets rechecked by __kvm_faultin_pfn(), which is protected by
the sequence counter, and so the technically unsafe read is verified in the end.
The obvious alternative is to make is_private an output of kvm_faultin_pfn(), but
that's incorrect for SNP and TDX guests, in which case "is_private" is a property
of the fault itself.

TL;DR: I'm going to delete the assertion and add a comment in kvm_mmu_do_page_fault()
explaining why it's safe to consume kvm_mem_is_private() for "legacy" guests.

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 35a339891aed..da0afe81cf10 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -2310,8 +2310,6 @@ static inline void kvm_account_pgtable_pages(void *virt, int nr)
 #ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
 static inline unsigned long kvm_get_memory_attributes(struct kvm *kvm, gfn_t gfn)
 {
-       lockdep_assert_held(kvm->mmu_lock);
-
        return xa_to_value(xa_load(&kvm->mem_attr_array, gfn));
 }