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Revert "ANDROID: KVM: arm64: pkvm: Ensure that TLBs and I-cache are private to each vcpu"

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This reverts commit 92a6dd3865.

Reason for revert: Suspected cause of hyp panic when running suite/user/pkvm_test

Bug: 232390891
Change-Id: Ie644c5484d8f1dde9630b9510a80988446ebbcdd
Signed-off-by: Will Deacon <willdeacon@google.com>
This commit is contained in:
Will Deacon
2022-05-13 15:27:07 +00:00
parent 435891a607
commit bb8c831668
1 changed files with 0 additions and 36 deletions
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36
arch/arm64/kvm/hyp/nvhe/pkvm.c
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@@ -225,11 +225,6 @@ static int index_to_shadow_handle(int index)
extern unsigned long hyp_nr_cpus;
/*
* Track the vcpu most recently loaded on each physical CPU.
*/
static DEFINE_PER_CPU(struct kvm_vcpu *, last_loaded_vcpu);
/*
* Spinlock for protecting the shadow table related state.
* Protects writes to shadow_table, num_shadow_entries, and next_shadow_alloc,
@@ -272,7 +267,6 @@ struct kvm_vcpu *get_shadow_vcpu(int shadow_handle, unsigned int vcpu_idx)
{
struct kvm_vcpu *vcpu = NULL;
struct kvm_shadow_vm *vm;
bool flush_context = false;
hyp_spin_lock(&shadow_lock);
vm = find_shadow_by_handle(shadow_handle);
@@ -285,28 +279,12 @@ struct kvm_vcpu *get_shadow_vcpu(int shadow_handle, unsigned int vcpu_idx)
vcpu = NULL;
goto unlock;
}
/*
* Guarantee that both TLBs and I-cache are private to each vcpu.
* The check below is conservative and could lead to over-invalidation,
* because there is no need to nuke the contexts if the vcpu belongs to
* a different vm.
*/
if (vcpu != __this_cpu_read(last_loaded_vcpu)) {
flush_context = true;
__this_cpu_write(last_loaded_vcpu, vcpu);
}
vcpu->arch.pkvm.loaded_on_cpu = true;
hyp_page_ref_inc(hyp_virt_to_page(vm));
unlock:
hyp_spin_unlock(&shadow_lock);
/* No need for the lock while flushing the context. */
if (flush_context)
__kvm_flush_cpu_context(vcpu->arch.hw_mmu);
return vcpu;
}
@@ -718,7 +696,6 @@ int __pkvm_teardown_shadow(int shadow_handle)
u64 pfn;
u64 nr_pages;
void *addr;
int i;
/* Lookup then remove entry from the shadow table. */
hyp_spin_lock(&shadow_lock);
@@ -733,19 +710,6 @@ int __pkvm_teardown_shadow(int shadow_handle)
goto err_unlock;
}
/*
* Clear the tracking for last_loaded_vcpu for all cpus for this vm in
* case the same addresses for those vcpus are reused for future vms.
*/
for (i = 0; i < hyp_nr_cpus; i++) {
struct kvm_vcpu **last_loaded_vcpu_ptr =
per_cpu_ptr(&last_loaded_vcpu, i);
struct kvm_vcpu *vcpu = *last_loaded_vcpu_ptr;
if (vcpu && vcpu->arch.pkvm.shadow_handle == shadow_handle)
*last_loaded_vcpu_ptr = NULL;
}
/* Ensure the VMID is clean before it can be reallocated */
__kvm_tlb_flush_vmid(&vm->arch.mmu);
remove_shadow_table(shadow_handle);