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| author | Paul Burton <paul.burton@mips.com> | 2019-02-02 01:43:25 +0000 |
|---|---|---|
| committer | Paul Burton <paul.burton@mips.com> | 2019-02-04 10:56:30 -0800 |
| commit | 42d5b846574f0904dbaf9dbdea4f19402589cddf (patch) | |
| tree | 77fdb7637de77008be9443b6b16de0be15beacb5 /arch/mips/kvm | |
| parent | 4ebea49ce233ce76421250f113a75d6d33c90e22 (diff) | |
| download | linux-stable-42d5b846574f0904dbaf9dbdea4f19402589cddf.tar.gz linux-stable-42d5b846574f0904dbaf9dbdea4f19402589cddf.tar.bz2 linux-stable-42d5b846574f0904dbaf9dbdea4f19402589cddf.zip | |
MIPS: mm: Unify ASID version checks
Introduce a new check_mmu_context() function to check an mm's ASID
version & get a new one if it's outdated, and a
check_switch_mmu_context() function which additionally sets up the new
ASID & page directory. Simplify switch_mm() & various
get_new_mmu_context() callsites in MIPS KVM by making use of the new
functions, which will help reduce the amount of code that requires
modification to gain MMID support.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Diffstat (limited to 'arch/mips/kvm')
| -rw-r--r-- | arch/mips/kvm/trap_emul.c | 22 | ||||
| -rw-r--r-- | arch/mips/kvm/vz.c | 6 |
2 files changed, 7 insertions, 21 deletions
diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c index 503c2fb7e4da..22ffe72a9e4b 100644 --- a/arch/mips/kvm/trap_emul.c +++ b/arch/mips/kvm/trap_emul.c @@ -1056,11 +1056,7 @@ static int kvm_trap_emul_vcpu_load(struct kvm_vcpu *vcpu, int cpu) */ if (current->flags & PF_VCPU) { mm = KVM_GUEST_KERNEL_MODE(vcpu) ? kern_mm : user_mm; - if ((cpu_context(cpu, mm) ^ asid_cache(cpu)) & - asid_version_mask(cpu)) - get_new_mmu_context(mm); - write_c0_entryhi(cpu_asid(cpu, mm)); - TLBMISS_HANDLER_SETUP_PGD(mm->pgd); + check_switch_mmu_context(mm); kvm_mips_suspend_mm(cpu); ehb(); } @@ -1074,11 +1070,7 @@ static int kvm_trap_emul_vcpu_put(struct kvm_vcpu *vcpu, int cpu) if (current->flags & PF_VCPU) { /* Restore normal Linux process memory map */ - if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) & - asid_version_mask(cpu))) - get_new_mmu_context(current->mm); - write_c0_entryhi(cpu_asid(cpu, current->mm)); - TLBMISS_HANDLER_SETUP_PGD(current->mm->pgd); + check_switch_mmu_context(current->mm); kvm_mips_resume_mm(cpu); ehb(); } @@ -1228,9 +1220,7 @@ static void kvm_trap_emul_vcpu_reenter(struct kvm_run *run, * Check if ASID is stale. This may happen due to a TLB flush request or * a lazy user MM invalidation. */ - if ((cpu_context(cpu, mm) ^ asid_cache(cpu)) & - asid_version_mask(cpu)) - get_new_mmu_context(mm); + check_mmu_context(mm); } static int kvm_trap_emul_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu) @@ -1266,11 +1256,7 @@ static int kvm_trap_emul_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu) cpu = smp_processor_id(); /* Restore normal Linux process memory map */ - if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) & - asid_version_mask(cpu))) - get_new_mmu_context(current->mm); - write_c0_entryhi(cpu_asid(cpu, current->mm)); - TLBMISS_HANDLER_SETUP_PGD(current->mm->pgd); + check_switch_mmu_context(current->mm); kvm_mips_resume_mm(cpu); htw_start(); diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c index d98c12a22eac..dde20887a70d 100644 --- a/arch/mips/kvm/vz.c +++ b/arch/mips/kvm/vz.c @@ -2454,10 +2454,10 @@ static void kvm_vz_vcpu_load_tlb(struct kvm_vcpu *vcpu, int cpu) * Root ASID dealiases guest GPA mappings in the root TLB. * Allocate new root ASID if needed. */ - if (cpumask_test_and_clear_cpu(cpu, &kvm->arch.asid_flush_mask) - || (cpu_context(cpu, gpa_mm) ^ asid_cache(cpu)) & - asid_version_mask(cpu)) + if (cpumask_test_and_clear_cpu(cpu, &kvm->arch.asid_flush_mask)) get_new_mmu_context(gpa_mm); + else + check_mmu_context(gpa_mm); } } |