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KVM: arm64: Define kvm_tlb_flush_vmid_range()

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Implement the helper kvm_tlb_flush_vmid_range() that acts
as a wrapper for range-based TLB invalidations. For the
given VMID, use the range-based TLBI instructions to do
the job or fallback to invalidating all the TLB entries.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Shaoqin Huang <shahuang@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230811045127.3308641-11-rananta@google.com
This commit is contained in:
Raghavendra Rao Ananta 2023-08-11 04:51:23 +00:00 • committed by Marc Zyngier
parent 6354d15052
commit 117940aa6e
2 changed files with 30 additions and 0 deletions
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10
arch/arm64/include/asm/kvm_pgtable.h
View file

@ -746,4 +746,14 @@ enum kvm_pgtable_prot kvm_pgtable_stage2_pte_prot(kvm_pte_t pte);
* kvm_pgtable_prot format.
*/
enum kvm_pgtable_prot kvm_pgtable_hyp_pte_prot(kvm_pte_t pte);
/**
* kvm_tlb_flush_vmid_range() - Invalidate/flush a range of TLB entries
*
* @mmu: Stage-2 KVM MMU struct
* @addr: The base Intermediate physical address from which to invalidate
* @size: Size of the range from the base to invalidate
*/
void kvm_tlb_flush_vmid_range(struct kvm_s2_mmu *mmu,
phys_addr_t addr, size_t size);
#endif /* __ARM64_KVM_PGTABLE_H__ */

20
arch/arm64/kvm/hyp/pgtable.c
View file

@ -670,6 +670,26 @@ static bool stage2_has_fwb(struct kvm_pgtable *pgt)
return !(pgt->flags & KVM_PGTABLE_S2_NOFWB);
}
void kvm_tlb_flush_vmid_range(struct kvm_s2_mmu *mmu,
phys_addr_t addr, size_t size)
{
unsigned long pages, inval_pages;
if (!system_supports_tlb_range()) {
kvm_call_hyp(__kvm_tlb_flush_vmid, mmu);
return;
}
pages = size >> PAGE_SHIFT;
while (pages > 0) {
inval_pages = min(pages, MAX_TLBI_RANGE_PAGES);
kvm_call_hyp(__kvm_tlb_flush_vmid_range, mmu, addr, inval_pages);
addr += inval_pages << PAGE_SHIFT;
pages -= inval_pages;
}
}
#define KVM_S2_MEMATTR(pgt, attr) PAGE_S2_MEMATTR(attr, stage2_has_fwb(pgt))
static int stage2_set_prot_attr(struct kvm_pgtable *pgt, enum kvm_pgtable_prot prot,