[PATCH v8 0/6] KVM: arm64: Hypervisor stack enhancements
Kalesh Singh
kaleshsingh at google.com
Wed Apr 20 14:42:51 PDT 2022
Hi all,
This is v8 of the nVHE hypervisor stack enhancements. This version is based
on 5.18-rc3.
Previous versions can be found at:
v7: https://lore.kernel.org/r/20220408200349.1529080-1-kaleshsingh@google.com/
v6: https://lore.kernel.org/r/20220314200148.2695206-1-kaleshsingh@google.com/
v5: https://lore.kernel.org/r/20220307184935.1704614-1-kaleshsingh@google.com/
v4: https://lore.kernel.org/r/20220225033548.1912117-1-kaleshsingh@google.com/
v3: https://lore.kernel.org/r/20220224051439.640768-1-kaleshsingh@google.com/
v2: https://lore.kernel.org/r/20220222165212.2005066-1-kaleshsingh@google.com/
v1: https://lore.kernel.org/r/20220210224220.4076151-1-kaleshsingh@google.com/
Thanks,
Kalesh
-----
This series is based on 5.18-rc3 and adds stack guard pages to nVHE and pKVM
hypervisor; and symbolization of hypervisor addresses.
The guard page stack overflow detection is based on the technique used by
arm64 VMAP_STACK. i.e. the stack is aligned such that the 'stack shift' bit
of any valid SP is 1. The 'stack shift' bit can be tested in the exception
entry to detect overflow without corrupting GPRs.
Kalesh Singh (6):
KVM: arm64: Introduce hyp_alloc_private_va_range()
KVM: arm64: Introduce pkvm_alloc_private_va_range()
KVM: arm64: Add guard pages for KVM nVHE hypervisor stack
KVM: arm64: Add guard pages for pKVM (protected nVHE) hypervisor stack
KVM: arm64: Detect and handle hypervisor stack overflows
KVM: arm64: Symbolize the nVHE HYP addresses
arch/arm64/include/asm/kvm_asm.h | 1 +
arch/arm64/include/asm/kvm_mmu.h | 3 ++
arch/arm64/kvm/arm.c | 37 +++++++++++--
arch/arm64/kvm/handle_exit.c | 13 ++---
arch/arm64/kvm/hyp/include/nvhe/mm.h | 6 ++-
arch/arm64/kvm/hyp/nvhe/host.S | 24 +++++++++
arch/arm64/kvm/hyp/nvhe/hyp-main.c | 18 ++++++-
arch/arm64/kvm/hyp/nvhe/mm.c | 78 ++++++++++++++++++----------
arch/arm64/kvm/hyp/nvhe/setup.c | 31 +++++++++--
arch/arm64/kvm/hyp/nvhe/switch.c | 7 ++-
arch/arm64/kvm/mmu.c | 68 ++++++++++++++++--------
scripts/kallsyms.c | 3 +-
12 files changed, 220 insertions(+), 69 deletions(-)
base-commit: b2d229d4ddb17db541098b83524d901257e93845
--
2.36.0.rc0.470.gd361397f0d-goog
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