[PATCH v3 17/32] KVM: arm64: Use kvm_arch for stage 2 pgtable

Quentin Perret
2021-03-03T14:06:27Z

In order to make use of the stage 2 pgtable code for the host stage 2,
use struct kvm_arch in lieu of struct kvm as the host will have the
former but not the latter.

Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Quentin Perret <qperret@google.com>
---
arch/arm64/include/asm/kvm_pgtable.h | 5 +++--
arch/arm64/kvm/hyp/pgtable.c | 6 +++---
arch/arm64/kvm/mmu.c | 2 +-
3 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h
index 7898610fbeeb..a8255d55c168 100644
--- a/arch/arm64/include/asm/kvm_pgtable.h
+++ b/arch/arm64/include/asm/kvm_pgtable.h
@@ -162,12 +162,13 @@ int kvm_pgtable_hyp_map(struct kvm_pgtable *pgt, u64 addr, u64 size, u64 phys,
/**
* kvm_pgtable_stage2_init() - Initialise a guest stage-2 page-table.
* @pgt: Uninitialised page-table structure to initialise.
- * @kvm: KVM structure representing the guest virtual machine.
+ * @arch: Arch-specific KVM structure representing the guest virtual
+ * machine.
* @mm_ops: Memory management callbacks.
*
* Return: 0 on success, negative error code on failure.
*/
-int kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm *kvm,
+int kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm_arch *arch,
struct kvm_pgtable_mm_ops *mm_ops);

/**
diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index 7ce0969203e8..3d79c8094cdd 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -879,11 +879,11 @@ int kvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, u64 addr, u64 size)
return kvm_pgtable_walk(pgt, addr, size, &walker);
}

-int kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm *kvm,
+int kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm_arch *arch,
struct kvm_pgtable_mm_ops *mm_ops)
{
size_t pgd_sz;
- u64 vtcr = kvm->arch.vtcr;
+ u64 vtcr = arch->vtcr;
u32 ia_bits = VTCR_EL2_IPA(vtcr);
u32 sl0 = FIELD_GET(VTCR_EL2_SL0_MASK, vtcr);
u32 start_level = VTCR_EL2_TGRAN_SL0_BASE - sl0;
@@ -896,7 +896,7 @@ int kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm *kvm,
pgt->ia_bits = ia_bits;
pgt->start_level = start_level;
pgt->mm_ops = mm_ops;
- pgt->mmu = &kvm->arch.mmu;
+ pgt->mmu = &arch->mmu;

/* Ensure zeroed PGD pages are visible to the hardware walker */
dsb(ishst);
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 9d331bf262d2..41f9c03cbcc3 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -457,7 +457,7 @@ int kvm_init_stage2_mmu(struct kvm *kvm, struct kvm_s2_mmu *mmu)
if (!pgt)
return -ENOMEM;

- err = kvm_pgtable_stage2_init(pgt, kvm, &kvm_s2_mm_ops);
+ err = kvm_pgtable_stage2_init(pgt, &kvm->arch, &kvm_s2_mm_ops);
if (err)
goto out_free_pgtable;