| Message ID | 20200903091712.46456-5-dbrazdil@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Independent per-CPU data section for nVHE | expand |
On Thu, Sep 03, 2020 at 11:17:06AM +0200, 'David Brazdil' via kernel-team wrote: > The hyp_adr/ldr_this_cpu helpers were introduced for use in hyp code > because they always needed to use TPIDR_EL2 for base, while > adr/ldr_this_cpu from kernel proper would select between TPIDR_EL2 and > _EL1 based on VHE/nVHE. > > Simplify this now that the nVHE hyp mode case can be handled using the > __KVM_NVHE_HYPERVISOR__ macro. VHE selects _EL2 with alternatives. > > Signed-off-by: David Brazdil <dbrazdil@google.com> Acked-by: Andrew Scull <ascull@google.com> > diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h > index 54d181177656..b392a977efb6 100644 > --- a/arch/arm64/include/asm/assembler.h > +++ b/arch/arm64/include/asm/assembler.h > @@ -218,6 +218,21 @@ lr .req x30 // link register > str \src, [\tmp, :lo12:\sym] > .endm > > + /* > + * @dst: destination register (32 or 64 bit wide) > + */ > + .macro this_cpu_offset, dst > +#ifdef __KVM_NVHE_HYPERVISOR__ > + mrs \dst, tpidr_el2 Another part that might also apply to __KVM_VHE_HYPERVISOR__. > +#else > +alternative_if_not ARM64_HAS_VIRT_HOST_EXTN > + mrs \dst, tpidr_el1 > +alternative_else > + mrs \dst, tpidr_el2 > +alternative_endif > +#endif > + .endm
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h index 54d181177656..b392a977efb6 100644 --- a/arch/arm64/include/asm/assembler.h +++ b/arch/arm64/include/asm/assembler.h @@ -218,6 +218,21 @@ lr .req x30 // link register str \src, [\tmp, :lo12:\sym] .endm + /* + * @dst: destination register (32 or 64 bit wide) + */ + .macro this_cpu_offset, dst +#ifdef __KVM_NVHE_HYPERVISOR__ + mrs \dst, tpidr_el2 +#else +alternative_if_not ARM64_HAS_VIRT_HOST_EXTN + mrs \dst, tpidr_el1 +alternative_else + mrs \dst, tpidr_el2 +alternative_endif +#endif + .endm + /* * @dst: Result of per_cpu(sym, smp_processor_id()) (can be SP) * @sym: The name of the per-cpu variable @@ -226,11 +241,7 @@ lr .req x30 // link register .macro adr_this_cpu, dst, sym, tmp adrp \tmp, \sym add \dst, \tmp, #:lo12:\sym -alternative_if_not ARM64_HAS_VIRT_HOST_EXTN - mrs \tmp, tpidr_el1 -alternative_else - mrs \tmp, tpidr_el2 -alternative_endif + this_cpu_offset \tmp add \dst, \dst, \tmp .endm @@ -241,11 +252,7 @@ alternative_endif */ .macro ldr_this_cpu dst, sym, tmp adr_l \dst, \sym -alternative_if_not ARM64_HAS_VIRT_HOST_EXTN - mrs \tmp, tpidr_el1 -alternative_else - mrs \tmp, tpidr_el2 -alternative_endif + this_cpu_offset \tmp ldr \dst, [\dst, \tmp] .endm diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h index 9149079f0269..469c0662f7f3 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -179,20 +179,8 @@ extern char __smccc_workaround_1_smc[__SMCCC_WORKAROUND_1_SMC_SZ]; #else /* __ASSEMBLY__ */ -.macro hyp_adr_this_cpu reg, sym, tmp - adr_l \reg, \sym - mrs \tmp, tpidr_el2 - add \reg, \reg, \tmp -.endm - -.macro hyp_ldr_this_cpu reg, sym, tmp - adr_l \reg, \sym - mrs \tmp, tpidr_el2 - ldr \reg, [\reg, \tmp] -.endm - .macro get_host_ctxt reg, tmp - hyp_adr_this_cpu \reg, kvm_host_data, \tmp + adr_this_cpu \reg, kvm_host_data, \tmp add \reg, \reg, #HOST_DATA_CONTEXT .endm diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S index 46b4dab933d0..fba91c2ab410 100644 --- a/arch/arm64/kvm/hyp/hyp-entry.S +++ b/arch/arm64/kvm/hyp/hyp-entry.S @@ -132,7 +132,7 @@ alternative_cb_end str x0, [x2, #VCPU_WORKAROUND_FLAGS] /* Check that we actually need to perform the call */ - hyp_ldr_this_cpu x0, arm64_ssbd_callback_required, x2 + ldr_this_cpu x0, arm64_ssbd_callback_required, x2 cbz x0, wa2_end mov w0, #ARM_SMCCC_ARCH_WORKAROUND_2
The hyp_adr/ldr_this_cpu helpers were introduced for use in hyp code because they always needed to use TPIDR_EL2 for base, while adr/ldr_this_cpu from kernel proper would select between TPIDR_EL2 and _EL1 based on VHE/nVHE. Simplify this now that the nVHE hyp mode case can be handled using the __KVM_NVHE_HYPERVISOR__ macro. VHE selects _EL2 with alternatives. Signed-off-by: David Brazdil <dbrazdil@google.com> --- arch/arm64/include/asm/assembler.h | 27 +++++++++++++++++---------- arch/arm64/include/asm/kvm_asm.h | 14 +------------- arch/arm64/kvm/hyp/hyp-entry.S | 2 +- 3 files changed, 19 insertions(+), 24 deletions(-)