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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2020-01-08 12:24:38 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-11 04:34:17 -0800 |
| commit | 21b70d9bc16e2d8377b61eb7913c047318a5a9be (patch) | |
| tree | fd7c68529fcae36341c14ed2faf67f3b3bcf85a4 /virt/kvm | |
| parent | dabf1a1096b2cb7c54eecbaee19367cae2aef0e3 (diff) | |
| download | linux-stable-21b70d9bc16e2d8377b61eb7913c047318a5a9be.tar.gz linux-stable-21b70d9bc16e2d8377b61eb7913c047318a5a9be.tar.bz2 linux-stable-21b70d9bc16e2d8377b61eb7913c047318a5a9be.zip | |
KVM: Play nice with read-only memslots when querying host page size
[ Upstream commit 42cde48b2d39772dba47e680781a32a6c4b7dc33 ]
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 05da45583de9 ("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: 4d8b81abc47b ("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>
Diffstat (limited to 'virt/kvm')
| -rw-r--r-- | virt/kvm/kvm_main.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index df7ece0bfcbd..beec19fcf8cd 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1301,7 +1301,7 @@ unsigned long kvm_host_page_size(struct kvm_vcpu *vcpu, gfn_t gfn) size = PAGE_SIZE; - addr = kvm_vcpu_gfn_to_hva(vcpu, gfn); + addr = kvm_vcpu_gfn_to_hva_prot(vcpu, gfn, NULL); if (kvm_is_error_hva(addr)) return PAGE_SIZE; |