[PATCH v3 14/32] KVM: arm64: Factor out vector address calculation

Quentin Perret
2021-03-03T15:00:34Z

In order to re-map the guest vectors at EL2 when pKVM is enabled,
refactor __kvm_vector_slot2idx() and kvm_init_vector_slot() to move all
the address calculation logic in a static inline function.

Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Quentin Perret <qperret@google.com>
---
arch/arm64/include/asm/kvm_mmu.h | 8 ++++++++
arch/arm64/kvm/arm.c | 9 +--------
2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index 90873851f677..5c42ec023cc7 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -168,6 +168,14 @@ phys_addr_t kvm_mmu_get_httbr(void);
phys_addr_t kvm_get_idmap_vector(void);
int kvm_mmu_init(void);

+static inline void *__kvm_vector_slot2addr(void *base,
+ enum arm64_hyp_spectre_vector slot)
+{
+ int idx = slot - (slot != HYP_VECTOR_DIRECT);
+
+ return base + (idx * SZ_2K);
+}
+
struct kvm;

#define kvm_flush_dcache_to_poc(a,l) __flush_dcache_area((a), (l))
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 3f8bcf8db036..26e573cdede3 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1345,16 +1345,9 @@ static unsigned long nvhe_percpu_order(void)
/* A lookup table holding the hypervisor VA for each vector slot */
static void *hyp_spectre_vector_selector[BP_HARDEN_EL2_SLOTS];

-static int __kvm_vector_slot2idx(enum arm64_hyp_spectre_vector slot)
-{
- return slot - (slot != HYP_VECTOR_DIRECT);
-}
-
static void kvm_init_vector_slot(void *base, enum arm64_hyp_spectre_vector slot)
{
- int idx = __kvm_vector_slot2idx(slot);
-
- hyp_spectre_vector_selector[slot] = base + (idx * SZ_2K);
+ hyp_spectre_vector_selector[slot] = __kvm_vector_slot2addr(base, slot);
}

static int kvm_init_vector_slots(void)