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Subject[RFC PATCH v2 00/26] KVM/arm64: A stage 2 for the host
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Hi all,

This is the v2 of the series previously posted here:

https://lore.kernel.org/kvmarm/20201117181607.1761516-1-qperret@google.com/

This basically allows us to wrap the host with a stage 2 when running in
nVHE, hence paving the way for protecting guest memory from the host in
the future (among other use-cases). For more details about the
motivation and the design angle taken here, I would recommend to have a
look at the cover letter of v1, and/or to watch these presentations at
LPC [1] and KVM forum 2020 [2].

In short, the changes since v1 include:

- Renamed most pkvm-specific pgtable functions as pkvm_* to avoid
confusion with the host's (Fuad)

- Added an IC flush when switching pgtables (Fuad, Mark)

- Cleaned-up the PI aliasing in image-vars.h (David)

- Added a TLB flush when enabling the host stage 2 to avoid stale TLBs
from bootloader

- Fixed the early memory reservation by using NR_CPUS instead of
num_possible_cpus() (which is always 1 that early)

- Added missing preempt_{dis,en}able() guards in
kvm_hyp_enable_protection()

- Rebased on latest kvmarm/next

And if you'd like a branch that has all the goodies, there it is:

https://android-kvm.googlesource.com/linux qperret/host-stage2-v2

Thanks!
Quentin

[1] https://youtu.be/54q6RzS9BpQ?t=10859
[2] https://kvmforum2020.sched.com/event/eE24/virtualization-for-the-masses-exposing-kvm-on-android-will-deacon-google

Quentin Perret (23):
KVM: arm64: Initialize kvm_nvhe_init_params early
KVM: arm64: Avoid free_page() in page-table allocator
KVM: arm64: Factor memory allocation out of pgtable.c
KVM: arm64: Introduce a BSS section for use at Hyp
KVM: arm64: Make kvm_call_hyp() a function call at Hyp
KVM: arm64: Allow using kvm_nvhe_sym() in hyp code
KVM: arm64: Introduce an early Hyp page allocator
KVM: arm64: Stub CONFIG_DEBUG_LIST at Hyp
KVM: arm64: Introduce a Hyp buddy page allocator
KVM: arm64: Enable access to sanitized CPU features at EL2
KVM: arm64: Factor out vector address calculation
of/fdt: Introduce early_init_dt_add_memory_hyp()
KVM: arm64: Prepare Hyp memory protection
KVM: arm64: Elevate Hyp mappings creation at EL2
KVM: arm64: Use kvm_arch for stage 2 pgtable
KVM: arm64: Use kvm_arch in kvm_s2_mmu
KVM: arm64: Set host stage 2 using kvm_nvhe_init_params
KVM: arm64: Refactor kvm_arm_setup_stage2()
KVM: arm64: Refactor __load_guest_stage2()
KVM: arm64: Refactor __populate_fault_info()
KVM: arm64: Make memcache anonymous in pgtable allocator
KVM: arm64: Reserve memory for host stage 2
KVM: arm64: Wrap the host with a stage 2

Will Deacon (3):
arm64: lib: Annotate {clear,copy}_page() as position-independent
KVM: arm64: Link position-independent string routines into .hyp.text
arm64: kvm: Add standalone ticket spinlock implementation for use at
hyp

arch/arm64/include/asm/cpufeature.h | 1 +
arch/arm64/include/asm/hyp_image.h | 7 +
arch/arm64/include/asm/kvm_asm.h | 7 +
arch/arm64/include/asm/kvm_cpufeature.h | 19 ++
arch/arm64/include/asm/kvm_host.h | 16 +-
arch/arm64/include/asm/kvm_hyp.h | 8 +
arch/arm64/include/asm/kvm_mmu.h | 69 +++++-
arch/arm64/include/asm/kvm_pgtable.h | 41 +++-
arch/arm64/include/asm/sections.h | 1 +
arch/arm64/kernel/asm-offsets.c | 3 +
arch/arm64/kernel/cpufeature.c | 12 +
arch/arm64/kernel/image-vars.h | 33 +++
arch/arm64/kernel/vmlinux.lds.S | 7 +
arch/arm64/kvm/arm.c | 144 ++++++++++--
arch/arm64/kvm/hyp/Makefile | 2 +-
arch/arm64/kvm/hyp/include/hyp/switch.h | 36 +--
arch/arm64/kvm/hyp/include/nvhe/early_alloc.h | 14 ++
arch/arm64/kvm/hyp/include/nvhe/gfp.h | 32 +++
arch/arm64/kvm/hyp/include/nvhe/mem_protect.h | 33 +++
arch/arm64/kvm/hyp/include/nvhe/memory.h | 55 +++++
arch/arm64/kvm/hyp/include/nvhe/mm.h | 107 +++++++++
arch/arm64/kvm/hyp/include/nvhe/spinlock.h | 92 ++++++++
arch/arm64/kvm/hyp/nvhe/Makefile | 9 +-
arch/arm64/kvm/hyp/nvhe/cache.S | 13 ++
arch/arm64/kvm/hyp/nvhe/cpufeature.c | 8 +
arch/arm64/kvm/hyp/nvhe/early_alloc.c | 60 +++++
arch/arm64/kvm/hyp/nvhe/hyp-init.S | 41 ++++
arch/arm64/kvm/hyp/nvhe/hyp-main.c | 48 ++++
arch/arm64/kvm/hyp/nvhe/hyp.lds.S | 1 +
arch/arm64/kvm/hyp/nvhe/mem_protect.c | 191 ++++++++++++++++
arch/arm64/kvm/hyp/nvhe/mm.c | 174 ++++++++++++++
arch/arm64/kvm/hyp/nvhe/page_alloc.c | 185 +++++++++++++++
arch/arm64/kvm/hyp/nvhe/psci-relay.c | 4 +-
arch/arm64/kvm/hyp/nvhe/setup.c | 214 ++++++++++++++++++
arch/arm64/kvm/hyp/nvhe/stub.c | 22 ++
arch/arm64/kvm/hyp/nvhe/switch.c | 12 +-
arch/arm64/kvm/hyp/nvhe/tlb.c | 4 +-
arch/arm64/kvm/hyp/pgtable.c | 98 ++++----
arch/arm64/kvm/hyp/reserved_mem.c | 104 +++++++++
arch/arm64/kvm/mmu.c | 114 +++++++++-
arch/arm64/kvm/reset.c | 42 +---
arch/arm64/lib/clear_page.S | 4 +-
arch/arm64/lib/copy_page.S | 4 +-
arch/arm64/mm/init.c | 3 +
drivers/of/fdt.c | 5 +
45 files changed, 1954 insertions(+), 145 deletions(-)
create mode 100644 arch/arm64/include/asm/kvm_cpufeature.h
create mode 100644 arch/arm64/kvm/hyp/include/nvhe/early_alloc.h
create mode 100644 arch/arm64/kvm/hyp/include/nvhe/gfp.h
create mode 100644 arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
create mode 100644 arch/arm64/kvm/hyp/include/nvhe/memory.h
create mode 100644 arch/arm64/kvm/hyp/include/nvhe/mm.h
create mode 100644 arch/arm64/kvm/hyp/include/nvhe/spinlock.h
create mode 100644 arch/arm64/kvm/hyp/nvhe/cache.S
create mode 100644 arch/arm64/kvm/hyp/nvhe/cpufeature.c
create mode 100644 arch/arm64/kvm/hyp/nvhe/early_alloc.c
create mode 100644 arch/arm64/kvm/hyp/nvhe/mem_protect.c
create mode 100644 arch/arm64/kvm/hyp/nvhe/mm.c
create mode 100644 arch/arm64/kvm/hyp/nvhe/page_alloc.c
create mode 100644 arch/arm64/kvm/hyp/nvhe/setup.c
create mode 100644 arch/arm64/kvm/hyp/nvhe/stub.c
create mode 100644 arch/arm64/kvm/hyp/reserved_mem.c

--
2.30.0.284.gd98b1dd5eaa7-goog

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