On 22/09/21 06:58, David Stevens wrote:
From: David Stevens<stevensd@xxxxxxxxxxxx>
Skip allocating gfn_track arrays when tracking of guest write access to
pages is not required. For VMs where the allocation can be avoided, this
saves 2 bytes per 4KB of guest memory.
Write tracking is used to manage shadow page tables in three cases -
when tdp is not supported, when nested virtualization is used, and for
GVT-g. If tdp_enable is set and the kernel is compiled without GVT-g,
then the gfn_track arrays can be allocated lazily when the shadow MMU is
initialized.
v1 -> v2:
- lazily allocate gfn_track when shadow MMU is initialized, instead
of looking at cpuid
Queued, thanks.
paolo
