KVM: x86/mmu: Zero allocate shadow pages (outside of mmu_lock)

Set __GFP_ZERO for the shadow page memory cache and drop the explicit
clear_page() from kvm_mmu_get_page().  This moves the cost of zeroing a
page to the allocation time of the physical page, i.e. when topping up
the memory caches, and thus avoids having to zero out an entire page
while holding mmu_lock.

Cc: Peter Feiner <[email protected]>
Cc: Peter Shier <[email protected]>
Cc: Junaid Shahid <[email protected]>
Cc: Jim Mattson <[email protected]>
Suggested-by: Ben Gardon <[email protected]>
Reviewed-by: Ben Gardon <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

0 files changed, 0 insertions, 0 deletions