Re: [PATCH 0/3] arm64: KVM: Kiss hyp_alternate_select() goodbye
On Sun, Sep 01, 2019 at 10:12:34PM +0100, Marc Zyngier wrote: > hyp_alternate_select() is a leftover from the my second attempt at > supporting VHE (the first one was never merged, thankfully), and is > now an irrelevant relic. It was a way to patch function pointers > without having to dereference memory, a bit like static keys for > function calls. > > Lovely idea, but since Christoffer mostly separated the VHE and !VHE > hypervisor paths, most of the uses of hyp_alternate_select() are > gone. What is left is two instances that are better replaced by > already existing static keys. One of the instances becomes > cpus_have_const_cap(), and the rest is a light sprinkling of > has_vhe(). > > So off it goes. > > Marc Zyngier (3): > arm64: KVM: Drop hyp_alternate_select for checking for > ARM64_WORKAROUND_834220 > arm64: KVM: Replace hyp_alternate_select with has_vhe() > arm64: KVM: Kill hyp_alternate_select() > > arch/arm64/include/asm/kvm_hyp.h | 24 - > arch/arm64/kvm/hyp/switch.c | 17 ++- > arch/arm64/kvm/hyp/tlb.c | 36 +++- > 3 files changed, 24 insertions(+), 53 deletions(-) > > -- > 2.20.1 > Yay! The 'func()(...)' stuff always gave me cross-eyes. Reviewed-by: Andrew Jones ___ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Re: [PATCH 0/3] arm64: KVM: Kiss hyp_alternate_select() goodbye
On Sun, Sep 01, 2019 at 10:12:34PM +0100, Marc Zyngier wrote: > hyp_alternate_select() is a leftover from the my second attempt at > supporting VHE (the first one was never merged, thankfully), and is > now an irrelevant relic. It was a way to patch function pointers > without having to dereference memory, a bit like static keys for > function calls. > > Lovely idea, but since Christoffer mostly separated the VHE and !VHE > hypervisor paths, most of the uses of hyp_alternate_select() are > gone. What is left is two instances that are better replaced by > already existing static keys. One of the instances becomes > cpus_have_const_cap(), and the rest is a light sprinkling of > has_vhe(). > > So off it goes. I'm not sure I want to kiss hyp_alternate_select() at all, but away it must go! Reviewed-by: Christoffer Dall ___ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
[PATCH 0/3] arm64: KVM: Kiss hyp_alternate_select() goodbye
hyp_alternate_select() is a leftover from the my second attempt at supporting VHE (the first one was never merged, thankfully), and is now an irrelevant relic. It was a way to patch function pointers without having to dereference memory, a bit like static keys for function calls. Lovely idea, but since Christoffer mostly separated the VHE and !VHE hypervisor paths, most of the uses of hyp_alternate_select() are gone. What is left is two instances that are better replaced by already existing static keys. One of the instances becomes cpus_have_const_cap(), and the rest is a light sprinkling of has_vhe(). So off it goes. Marc Zyngier (3): arm64: KVM: Drop hyp_alternate_select for checking for ARM64_WORKAROUND_834220 arm64: KVM: Replace hyp_alternate_select with has_vhe() arm64: KVM: Kill hyp_alternate_select() arch/arm64/include/asm/kvm_hyp.h | 24 - arch/arm64/kvm/hyp/switch.c | 17 ++- arch/arm64/kvm/hyp/tlb.c | 36 +++- 3 files changed, 24 insertions(+), 53 deletions(-) -- 2.20.1 ___ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
