Sean Christopherson 21b70d9bc1 KVM: Play nice with read-only memslots when querying host page size ...

[ Upstream commit 42cde48b2d ]

Avoid the "writable" check in __gfn_to_hva_many(), which will always fail
on read-only memslots due to gfn_to_hva() assuming writes.  Functionally,
this allows x86 to create large mappings for read-only memslots that
are backed by HugeTLB mappings.

Note, the changelog for commit 05da45583d ("KVM: MMU: large page
support") states "If the largepage contains write-protected pages, a
large pte is not used.", but "write-protected" refers to pages that are
temporarily read-only, e.g. read-only memslots didn't even exist at the
time.

Fixes: 4d8b81abc4 ("KVM: introduce readonly memslot")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
[Redone using kvm_vcpu_gfn_to_memslot_prot. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2020-02-11 04:34:17 -08:00

..

kvm

KVM: Play nice with read-only memslots when querying host page size

2020-02-11 04:34:17 -08:00

lib

KVM: eventfd: fix NULL deref irqbypass consumer

2017-01-12 14:42:34 +01:00

Makefile

virt: Add virt directory to the top Makefile

2015-10-01 15:06:44 +02:00