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x86/kvm/nVMX: introduce source data cache for kvm_init_shadow_ept_mmu()

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MMU re-initialization is expensive, in particular,
update_permission_bitmask() and update_pkru_bitmask() are.

Cache the data used to setup shadow EPT MMU and avoid full re-init when
it is unchanged.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov
2018-10-08 21:28:11 +02:00
committed by Paolo Bonzini
parent 36d9594dfb
commit a336282d77
2 changed files with 52 additions and 15 deletions
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14
arch/x86/include/asm/kvm_host.h
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@@ -283,7 +283,21 @@ union kvm_mmu_page_role {
};
union kvm_mmu_extended_role {
/*
* This structure complements kvm_mmu_page_role caching everything needed for
* MMU configuration. If nothing in both these structures changed, MMU
* re-configuration can be skipped. @valid bit is set on first usage so we don't
* treat all-zero structure as valid data.
*/
u32 word;
struct {
unsigned int valid:1;
unsigned int execonly:1;
unsigned int cr4_pse:1;
unsigned int cr4_pke:1;
unsigned int cr4_smap:1;
unsigned int cr4_smep:1;
};
};
union kvm_mmu_role {