[PATCH v2 00/21] KVM: Cleanup and unify kvm_mmu_memory_cache usage

Sean Christopherson
2020-06-22T20:09:14Z

Note, patch 18 will conflict with the p4d rework in 5.8. I originally
stated I would send v2 only after that got pulled into Paolo's tree, but
I got my timing wrong, i.e. I was thinking that would have already
happened. I'll send v3 if necessary. I wanted to get v2 out there now
that I actually compile tested other architectures.

Marc, I interpreted your "nothing caught fire" as Tested-by for the arm64
patches, let me know if that's not what you intended.

This series resurrects Christoffer Dall's series[1] to provide a common
MMU memory cache implementation that can be shared by x86, arm64 and MIPS.

It also picks up a suggested change from Ben Gardon[2] to clear shadow
page tables during initial allocation so as to avoid clearing entire
pages while holding mmu_lock.

The front half of the patches do house cleaning on x86's memory cache
implementation in preparation for moving it to common code, along with a
fair bit of cleanup on the usage. The middle chunk moves the patches to
common KVM, and the last two chunks convert arm64 and MIPS to the common
implementation.

Fully tested on x86 only. Compile tested patches 14-21 on arm64, MIPS,
s390 and PowerPC.

v2:
- Rebase to kvm-5.8-2, commit 49b3deaad345 ("Merge tag ...").
- Use an asm-generic kvm_types.h for s390 and PowerPC instead of an
empty arch-specific file. [Marc]
- Explicit document "GFP_PGTABLE_USER == GFP_KERNEL_ACCOUNT | GFP_ZERO"
in the arm64 conversion patch. [Marc]
- Collect review tags. [Ben]

[1] https://lkml.kernel.org/r/20191105110357.8607-1-christoffer.dall@arm
[2] https://lkml.kernel.org/r/20190926231824.149014-4-bgardon@google.com

Sean Christopherson (21):
KVM: x86/mmu: Track the associated kmem_cache in the MMU caches
KVM: x86/mmu: Consolidate "page" variant of memory cache helpers
KVM: x86/mmu: Use consistent "mc" name for kvm_mmu_memory_cache locals
KVM: x86/mmu: Remove superfluous gotos from mmu_topup_memory_caches()
KVM: x86/mmu: Try to avoid crashing KVM if a MMU memory cache is empty
KVM: x86/mmu: Move fast_page_fault() call above
mmu_topup_memory_caches()
KVM: x86/mmu: Topup memory caches after walking GVA->GPA
KVM: x86/mmu: Clean up the gorilla math in mmu_topup_memory_caches()
KVM: x86/mmu: Separate the memory caches for shadow pages and gfn
arrays
KVM: x86/mmu: Make __GFP_ZERO a property of the memory cache
KVM: x86/mmu: Zero allocate shadow pages (outside of mmu_lock)
KVM: x86/mmu: Skip filling the gfn cache for guaranteed direct MMU
topups
KVM: x86/mmu: Prepend "kvm_" to memory cache helpers that will be
global
KVM: Move x86's version of struct kvm_mmu_memory_cache to common code
KVM: Move x86's MMU memory cache helpers to common KVM code
KVM: arm64: Drop @max param from mmu_topup_memory_cache()
KVM: arm64: Use common code's approach for __GFP_ZERO with memory
caches
KVM: arm64: Use common KVM implementation of MMU memory caches
KVM: MIPS: Drop @max param from mmu_topup_memory_cache()
KVM: MIPS: Account pages used for GPA page tables
KVM: MIPS: Use common KVM implementation of MMU memory caches

arch/arm64/include/asm/kvm_host.h | 11 ---
arch/arm64/include/asm/kvm_types.h | 8 ++
arch/arm64/kvm/arm.c | 2 +
arch/arm64/kvm/mmu.c | 54 +++---------
arch/mips/include/asm/kvm_host.h | 11 ---
arch/mips/include/asm/kvm_types.h | 7 ++
arch/mips/kvm/mmu.c | 44 ++--------
arch/powerpc/include/asm/Kbuild | 1 +
arch/s390/include/asm/Kbuild | 1 +
arch/x86/include/asm/kvm_host.h | 14 +---
arch/x86/include/asm/kvm_types.h | 7 ++
arch/x86/kvm/mmu/mmu.c | 129 +++++++++--------------------
arch/x86/kvm/mmu/paging_tmpl.h | 10 +--
include/asm-generic/kvm_types.h | 5 ++
include/linux/kvm_host.h | 7 ++
include/linux/kvm_types.h | 19 +++++
virt/kvm/kvm_main.c | 55 ++++++++++++
17 files changed, 175 insertions(+), 210 deletions(-)
create mode 100644 arch/arm64/include/asm/kvm_types.h
create mode 100644 arch/mips/include/asm/kvm_types.h
create mode 100644 arch/x86/include/asm/kvm_types.h
create mode 100644 include/asm-generic/kvm_types.h

--
2.26.0