Sean Christopherson 0be4435207 KVM: x86/mmu: Reuse the current root if possible for fast switch ... Reuse the current root when possible instead of grabbing a different root from the array of cached roots. Doing so avoids unnecessary MMU switches and also fixes a quirk where KVM can't reuse roots without creating multiple roots since the cache is a victim cache, i.e. roots are added to the cache when they're "evicted", not when they are created. The quirk could be fixed by adding roots to the cache on creation, but that would reduce the effective size of the cache as one of its entries would be burned to track the current root. Reusing the current root is especially helpful for nested virt as the current root is almost always usable for the "new" MMU on nested VM-entry/VM-exit. Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2020-03-16 17:57:37 +01:00
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mmu.c	KVM: x86/mmu: Reuse the current root if possible for fast switch	2020-03-16 17:57:37 +01:00
page_track.c	KVM: Remove unnecessary asm/kvm_host.h includes	2020-03-16 17:57:34 +01:00
paging_tmpl.h	KVM: x86/mmu: Fix struct guest_walker arrays for 5-level paging	2020-02-12 20:09:44 +01:00