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| author | James Hogan <james.hogan@imgtec.com> | 2016-12-16 15:57:00 +0000 |
|---|---|---|
| committer | James Hogan <james.hogan@imgtec.com> | 2017-02-03 15:20:55 +0000 |
| commit | a31b50d741bd85a127d5ef2c21c0788041bc41a9 (patch) | |
| tree | e67fc587b0eb2d038b20f3b9b67be6a5bdf868b5 /arch/mips/kvm/emulate.c | |
| parent | 57e3869cfaaec712f6ea1855ab7ba868f6f306ed (diff) | |
| download | linux-a31b50d741bd85a127d5ef2c21c0788041bc41a9.tar.bz2 | |
KVM: MIPS/MMU: Invalidate GVA PTs on ASID changes
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
Diffstat (limited to 'arch/mips/kvm/emulate.c')
| -rw-r--r-- | arch/mips/kvm/emulate.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/mips/kvm/emulate.c b/arch/mips/kvm/emulate.c index 611b8996ca0c..1d399396e486 100644 --- a/arch/mips/kvm/emulate.c +++ b/arch/mips/kvm/emulate.c @@ -1172,6 +1172,17 @@ enum emulation_result kvm_mips_emulate_CP0(union mips_instruction inst, nasid); /* + * Flush entries from the GVA page + * tables. + * Guest user page table will get + * flushed lazily on re-entry to guest + * user if the guest ASID actually + * changes. + */ + kvm_mips_flush_gva_pt(kern_mm->pgd, + KMF_KERN); + + /* * Regenerate/invalidate kernel MMU * context. * The user MMU context will be |