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| author | James Hogan <james.hogan@imgtec.com> | 2016-09-08 22:57:03 +0100 |
|---|---|---|
| committer | James Hogan <james.hogan@imgtec.com> | 2017-02-03 15:20:50 +0000 |
| commit | f7f1427dc0c67e21ba9ec2200b7c8853535b3842 (patch) | |
| tree | f28721d884797cacf91eaf90d64232d882a34f85 /arch/mips/kvm | |
| parent | 630766b3694f0574f903863ef5c3cc4f2bbe736f (diff) | |
| download | linux-f7f1427dc0c67e21ba9ec2200b7c8853535b3842.tar.bz2 | |
KVM: MIPS/T&E: Allocate GVA -> HPA page tables
Allocate GVA -> HPA page tables for guest kernel and guest user mode on
each VCPU, to allow for fast path TLB refill handling to be added later.
In the process kvm_arch_vcpu_init() needs updating to pass on any error
from the vcpu_init() callback.
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')
| -rw-r--r-- | arch/mips/kvm/mips.c | 7 | ||||
| -rw-r--r-- | arch/mips/kvm/trap_emul.c | 63 |
2 files changed, 69 insertions, 1 deletions
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c index 011710a68c6b..7cf85fa1f658 100644 --- a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -1338,7 +1338,12 @@ static enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer) int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) { - kvm_mips_callbacks->vcpu_init(vcpu); + int err; + + err = kvm_mips_callbacks->vcpu_init(vcpu); + if (err) + return err; + hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup; diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c index 07540cf2b557..183150a963ec 100644 --- a/arch/mips/kvm/trap_emul.c +++ b/arch/mips/kvm/trap_emul.c @@ -14,6 +14,7 @@ #include <linux/kvm_host.h> #include <linux/vmalloc.h> #include <asm/mmu_context.h> +#include <asm/pgalloc.h> #include "interrupt.h" @@ -435,13 +436,75 @@ static int kvm_trap_emul_vm_init(struct kvm *kvm) static int kvm_trap_emul_vcpu_init(struct kvm_vcpu *vcpu) { + struct mm_struct *kern_mm = &vcpu->arch.guest_kernel_mm; + struct mm_struct *user_mm = &vcpu->arch.guest_user_mm; + vcpu->arch.kscratch_enabled = 0xfc; + /* + * Allocate GVA -> HPA page tables. + * MIPS doesn't use the mm_struct pointer argument. + */ + kern_mm->pgd = pgd_alloc(kern_mm); + if (!kern_mm->pgd) + return -ENOMEM; + + user_mm->pgd = pgd_alloc(user_mm); + if (!user_mm->pgd) { + pgd_free(kern_mm, kern_mm->pgd); + return -ENOMEM; + } + return 0; } +static void kvm_mips_emul_free_gva_pt(pgd_t *pgd) +{ + /* Don't free host kernel page tables copied from init_mm.pgd */ + const unsigned long end = 0x80000000; + unsigned long pgd_va, pud_va, pmd_va; + pud_t *pud; + pmd_t *pmd; + pte_t *pte; + int i, j, k; + + for (i = 0; i < USER_PTRS_PER_PGD; i++) { + if (pgd_none(pgd[i])) + continue; + + pgd_va = (unsigned long)i << PGDIR_SHIFT; + if (pgd_va >= end) + break; + pud = pud_offset(pgd + i, 0); + for (j = 0; j < PTRS_PER_PUD; j++) { + if (pud_none(pud[j])) + continue; + + pud_va = pgd_va | ((unsigned long)j << PUD_SHIFT); + if (pud_va >= end) + break; + pmd = pmd_offset(pud + j, 0); + for (k = 0; k < PTRS_PER_PMD; k++) { + if (pmd_none(pmd[k])) + continue; + + pmd_va = pud_va | (k << PMD_SHIFT); + if (pmd_va >= end) + break; + pte = pte_offset(pmd + k, 0); + pte_free_kernel(NULL, pte); + } + pmd_free(NULL, pmd); + } + pud_free(NULL, pud); + } + pgd_free(NULL, pgd); +} + static void kvm_trap_emul_vcpu_uninit(struct kvm_vcpu *vcpu) { + kvm_mips_emul_free_gva_pt(vcpu->arch.guest_kernel_mm.pgd); + kvm_mips_emul_free_gva_pt(vcpu->arch.guest_user_mm.pgd); } static int kvm_trap_emul_vcpu_setup(struct kvm_vcpu *vcpu) |