diff options
| author | Marc Zyngier <maz@kernel.org> | 2020-06-05 14:08:13 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2020-06-09 10:59:52 +0100 |
| commit | 07da1ffaa1373f99331712faa67a00b5b807dfe8 (patch) | |
| tree | c3c5e732314aabf8e6e3a33abdcd05fe99048cd6 /arch/arm64/kvm/hyp/debug-sr.c | |
| parent | b990d37fdf6781fd0907ffd14d0dff16b5d58ffa (diff) | |
| download | linux-07da1ffaa1373f99331712faa67a00b5b807dfe8.tar.gz | |
KVM: arm64: Remove host_cpu_context member from vcpu structure
For very long, we have kept this pointer back to the per-cpu
host state, despite having working per-cpu accessors at EL2
for some time now.
Recent investigations have shown that this pointer is easy
to abuse in preemptible context, which is a sure sign that
it would better be gone. Not to mention that a per-cpu
pointer is faster to access at all times.
Reported-by: Andrew Scull <ascull@google.com>
Acked-by: Mark Rutland <mark.rutland@arm.com
Reviewed-by: Andrew Scull <ascull@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Diffstat (limited to 'arch/arm64/kvm/hyp/debug-sr.c')
| -rw-r--r-- | arch/arm64/kvm/hyp/debug-sr.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm64/kvm/hyp/debug-sr.c b/arch/arm64/kvm/hyp/debug-sr.c index 0fc9872a1467..e95af204fec7 100644 --- a/arch/arm64/kvm/hyp/debug-sr.c +++ b/arch/arm64/kvm/hyp/debug-sr.c @@ -185,7 +185,7 @@ void __hyp_text __debug_switch_to_guest(struct kvm_vcpu *vcpu) if (!(vcpu->arch.flags & KVM_ARM64_DEBUG_DIRTY)) return; - host_ctxt = kern_hyp_va(vcpu->arch.host_cpu_context); + host_ctxt = &__hyp_this_cpu_ptr(kvm_host_data)->host_ctxt; guest_ctxt = &vcpu->arch.ctxt; host_dbg = &vcpu->arch.host_debug_state.regs; guest_dbg = kern_hyp_va(vcpu->arch.debug_ptr); @@ -207,7 +207,7 @@ void __hyp_text __debug_switch_to_host(struct kvm_vcpu *vcpu) if (!(vcpu->arch.flags & KVM_ARM64_DEBUG_DIRTY)) return; - host_ctxt = kern_hyp_va(vcpu->arch.host_cpu_context); + host_ctxt = &__hyp_this_cpu_ptr(kvm_host_data)->host_ctxt; guest_ctxt = &vcpu->arch.ctxt; host_dbg = &vcpu->arch.host_debug_state.regs; guest_dbg = kern_hyp_va(vcpu->arch.debug_ptr); |