kernel.git/arch/arm64/kvm/va_layout.c, branch master

KVM: arm64: Calculate hyp VA size only once

2026-01-14T10:40:11Z

Calculate the hypervisor's VA size only once to maintain consistency between the memory layout and MMU initialization logic. Previously the two would be inconsistent when the kernel is configured for less than IDMAP_VA_BITS of VA space. Signed-off-by: Petteri Kangaslampi Tested-by: Vincent Donnefort Link: https://patch.msgid.link/20260113194409.2970324-2-pekangas@google.com Signed-off-by: Marc Zyngier

arm64: alternatives: kvm: prepare for cap changes

2022-09-16T16:15:02Z

The KVM patching callbacks use cpus_have_final_cap() internally within has_vhe(), and subsequent patches will make it invalid to call cpus_have_final_cap() before alternatives patching has completed, and will mean that cpus_have_const_cap() will always fall back to dynamic checks prior to alternatives patching. In preparation for said change, this patch modifies the KVM patching callbacks to use cpus_have_cap() directly. This is not subject to patching, and will dynamically check the cpu_hwcaps array, which is functionally equivalent to the existing behaviour. There should be no functional change as a result of this patch. Signed-off-by: Mark Rutland Cc: Ard Biesheuvel Cc: James Morse Cc: Joey Gouly Cc: Marc Zyngier Cc: Will Deacon Reviewed-by: Ard Biesheuvel Link: https://lore.kernel.org/r/20220912162210.3626215-3-mark.rutland@arm.com Signed-off-by: Catalin Marinas

KVM: arm64: Generate final CTR_EL0 value when running in Protected mode

2021-03-25T11:00:33Z

In protected mode, late CPUs are not allowed to boot (enforced by the PSCI relay). We can thus specialise the read_ctr macro to always return a pre-computed, sanitised value. Special care is taken to prevent the use of this custome version outside of the protected mode. Reviewed-by: Quentin Perret Signed-off-by: Marc Zyngier

KVM: arm64: Remove patching of fn pointers in hyp

2021-01-23T14:01:00Z

Storing a function pointer in hyp now generates relocation information used at early boot to convert the address to hyp VA. The existing alternative-based conversion mechanism is therefore obsolete. Remove it and simplify its users. Acked-by: Ard Biesheuvel Signed-off-by: David Brazdil Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20210105180541.65031-8-dbrazdil@google.com

KVM: arm64: Apply hyp relocations at runtime

2021-01-23T14:01:00Z

KVM nVHE code runs under a different VA mapping than the kernel, hence so far it avoided using absolute addressing because the VA in a constant pool is relocated by the linker to a kernel VA (see hyp_symbol_addr). Now the kernel has access to a list of positions that contain a kimg VA but will be accessed only in hyp execution context. These are generated by the gen-hyprel build-time tool and stored in .hyp.reloc. Add early boot pass over the entries and convert the kimg VAs to hyp VAs. Note that this requires for .hyp* ELF sections to be mapped read-write at that point. Signed-off-by: David Brazdil Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20210105180541.65031-6-dbrazdil@google.com

KVM: arm64: Minor cleanup of hyp variables used in host

2020-12-22T10:49:01Z

Small cleanup moving declarations of hyp-exported variables to kvm_host.h and using macros to avoid having to refer to them with kvm_nvhe_sym() in host. No functional change intended. Signed-off-by: David Brazdil Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20201208142452.87237-5-dbrazdil@google.com

KVM: arm64: Use lm_alias in nVHE-only VA conversion

2020-12-22T10:48:50Z

init_hyp_physvirt_offset() computes PA from a kernel VA. Conversion to kernel linear-map is required first but the code used kvm_ksym_ref() for this purpose. Under VHE that is a NOP and resulted in a runtime warning. Replace kvm_ksym_ref with lm_alias. Reported-by: Qian Cai Signed-off-by: David Brazdil Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20201208142452.87237-3-dbrazdil@google.com

Merge remote-tracking branch 'origin/kvm-arm64/psci-relay' into kvmarm-master/next

2020-12-09T10:00:24Z

Signed-off-by: Marc Zyngier

KVM: arm64: Add offset for hyp VA <-> PA conversion

2020-12-04T10:08:34Z

Add a host-initialized constant to KVM nVHE hyp code for converting between EL2 linear map virtual addresses and physical addresses. Also add `__hyp_pa` macro that performs the conversion. Signed-off-by: David Brazdil Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20201202184122.26046-18-dbrazdil@google.com

Merge branch 'kvm-arm64/vector-rework' into kvmarm-master/next

2020-11-27T11:47:08Z

Signed-off-by: Marc Zyngier