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KVM: MIPS/MMU: Invalidate GVA PTs on ASID changes

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Implement invalidation of large ranges of virtual addresses from GVA
page tables in response to a guest ASID change (immediately for guest
kernel page table, lazily for guest user page table).

We iterate through a range of page tables invalidating entries and
freeing fully invalidated tables. To minimise overhead the exact ranges
invalidated depends on the flags argument to kvm_mips_flush_gva_pt(),
which also allows it to be used in future KVM_CAP_SYNC_MMU patches in
response to GPA changes, which unlike guest TLB mapping changes affects
guest KSeg0 mappings.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
This commit is contained in:
James Hogan
2016-12-16 15:57:00 +00:00
parent 57e3869cfa
commit a31b50d741
4 changed files with 165 additions and 2 deletions
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17
arch/mips/include/asm/kvm_host.h
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@ -614,6 +614,23 @@ extern int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr);
void kvm_mips_suspend_mm(int cpu);
void kvm_mips_resume_mm(int cpu);
/* MMU handling */
/**
* enum kvm_mips_flush - Types of MMU flushes.
* @KMF_USER: Flush guest user virtual memory mappings.
* Guest USeg only.
* @KMF_KERN: Flush guest kernel virtual memory mappings.
* Guest USeg and KSeg2/3.
* @KMF_GPA: Flush guest physical memory mappings.
* Also includes KSeg0 if KMF_KERN is set.
*/
enum kvm_mips_flush {
KMF_USER = 0x0,
KMF_KERN = 0x1,
KMF_GPA = 0x2,
};
void kvm_mips_flush_gva_pt(pgd_t *pgd, enum kvm_mips_flush flags);
extern unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu,
unsigned long gva);
extern void kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu,