From: Lai Jiangshan <jiangshanlai@gmail.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>
Cc: Lai Jiangshan <jiangshan.ljs@antgroup.com>
Subject: [PATCH V2 0/7] KVM: X86/MMU: Use one-off special shadow page for special roots
Date: Tue, 3 May 2022 23:07:28 +0800 [thread overview]
Message-ID: <20220503150735.32723-1-jiangshanlai@gmail.com> (raw)
From: Lai Jiangshan <jiangshan.ljs@antgroup.com>
Current code uses mmu->pae_root, mmu->pml4_root, and mmu->pml5_root to
setup special roots. The initialization code is complex and the roots
are not associated with struct kvm_mmu_page which causes the code more
complex.
So add new special shadow pages to simplify it.
The special shadow pages are associated with struct kvm_mmu_page and
VCPU-local.
The special shadow pages are created and freed when the roots are
changed (or one-off) which can be optimized but not in the patchset
since the re-creating is light way (in normal case only the struct
kvm_mmu_page needs to be re-allocated and sp->spt doens't, because
it is likely to be mmu->pae_root)
Changed from v1:
Rebase to newest kvm/queue. Slightly update patch4.
[V1]: https://lore.kernel.org/lkml/20220420132605.3813-1-jiangshanlai@gmail.com/
Lai Jiangshan (7):
KVM: X86/MMU: Add using_special_root_page()
KVM: X86/MMU: Add special shadow pages
KVM: X86/MMU: Link PAE root pagetable with its children
KVM: X86/MMU: Activate special shadow pages and remove old logic
KVM: X86/MMU: Remove the check of the return value of to_shadow_page()
KVM: X86/MMU: Allocate mmu->pae_root for PAE paging on-demand
KVM: X86/MMU: Remove mmu_alloc_special_roots()
arch/x86/include/asm/kvm_host.h | 3 -
arch/x86/kvm/mmu/mmu.c | 487 ++++++++++----------------------
arch/x86/kvm/mmu/mmu_internal.h | 10 -
arch/x86/kvm/mmu/paging_tmpl.h | 14 +-
arch/x86/kvm/mmu/spte.c | 7 +
arch/x86/kvm/mmu/spte.h | 1 +
arch/x86/kvm/mmu/tdp_mmu.h | 7 +-
7 files changed, 178 insertions(+), 351 deletions(-)
--
2.19.1.6.gb485710b
next reply other threads:[~2022-05-03 15:07 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-03 15:07 Lai Jiangshan [this message]
2022-05-03 15:07 ` [PATCH V2 1/7] KVM: X86/MMU: Add using_special_root_page() Lai Jiangshan
2022-05-13 22:53 ` David Matlack
2022-05-26 9:20 ` Lai Jiangshan
2022-05-03 15:07 ` [PATCH V2 2/7] KVM: X86/MMU: Add special shadow pages Lai Jiangshan
2022-05-13 23:43 ` David Matlack
2022-05-26 9:38 ` Lai Jiangshan
2022-05-03 15:07 ` [PATCH V2 3/7] KVM: X86/MMU: Link PAE root pagetable with its children Lai Jiangshan
2022-05-17 0:01 ` David Matlack
2022-05-17 1:13 ` Lai Jiangshan
2022-05-17 16:41 ` David Matlack
2022-05-26 9:12 ` Lai Jiangshan
2022-05-03 15:07 ` [PATCH V2 4/7] KVM: X86/MMU: Activate special shadow pages and remove old logic Lai Jiangshan
2022-05-17 0:16 ` David Matlack
2022-05-26 9:15 ` Lai Jiangshan
2022-05-03 15:07 ` [PATCH V2 5/7] KVM: X86/MMU: Remove the check of the return value of to_shadow_page() Lai Jiangshan
2022-05-17 16:47 ` David Matlack
2022-05-03 15:07 ` [PATCH V2 6/7] KVM: X86/MMU: Allocate mmu->pae_root for PAE paging on-demand Lai Jiangshan
2022-05-17 16:57 ` David Matlack
2022-05-26 8:52 ` Lai Jiangshan
2022-05-03 15:07 ` [PATCH V2 7/7] KVM: X86/MMU: Remove mmu_alloc_special_roots() Lai Jiangshan
2022-05-13 8:22 ` [PATCH V2 0/7] KVM: X86/MMU: Use one-off special shadow page for special roots Lai Jiangshan
2022-05-13 18:31 ` David Matlack
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