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KVM: arm64: Use kvm_arch_flush_remote_tlbs()

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Stop depending on CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL and opt to
standardize on kvm_arch_flush_remote_tlbs() since it avoids
duplicating the generic TLB stats across architectures that implement
their own remote TLB flush.

This adds an extra function call to the ARM64 kvm_flush_remote_tlbs()
path, but that is a small cost in comparison to flushing remote TLBs.

In addition, instead of just incrementing remote_tlb_flush_requests
stat, the generic interface would also increment the
remote_tlb_flush stat.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
Reviewed-by: Shaoqin Huang <shahuang@redhat.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230811045127.3308641-4-rananta@google.com
This commit is contained in:
Raghavendra Rao Ananta 2023-08-11 04:51:16 +00:00 • committed by Marc Zyngier
parent cfb0c08e80
commit 32121c8138
3 changed files with 5 additions and 4 deletions
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2
arch/arm64/include/asm/kvm_host.h
View file

@ -1113,6 +1113,8 @@ int __init kvm_set_ipa_limit(void);
#define __KVM_HAVE_ARCH_VM_ALLOC
struct kvm *kvm_arch_alloc_vm(void);
#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS
static inline bool kvm_vm_is_protected(struct kvm *kvm)
{
return false;

1
arch/arm64/kvm/Kconfig
View file

@ -25,7 +25,6 @@ menuconfig KVM
select MMU_NOTIFIER
select PREEMPT_NOTIFIERS
select HAVE_KVM_CPU_RELAX_INTERCEPT
select HAVE_KVM_ARCH_TLB_FLUSH_ALL
select KVM_MMIO
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
select KVM_XFER_TO_GUEST_WORK

6
arch/arm64/kvm/mmu.c
View file

@ -161,15 +161,15 @@ static bool memslot_is_logging(struct kvm_memory_slot *memslot)
}
/**
* kvm_flush_remote_tlbs() - flush all VM TLB entries for v7/8
* kvm_arch_flush_remote_tlbs() - flush all VM TLB entries for v7/8
* @kvm: pointer to kvm structure.
*
* Interface to HYP function to flush all VM TLB entries
*/
void kvm_flush_remote_tlbs(struct kvm *kvm)
int kvm_arch_flush_remote_tlbs(struct kvm *kvm)
{
++kvm->stat.generic.remote_tlb_flush_requests;
kvm_call_hyp(__kvm_tlb_flush_vmid, &kvm->arch.mmu);
return 0;
}
static bool kvm_is_device_pfn(unsigned long pfn)