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KVM: arm64: Remove redundant hyp vectors entry

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The hyp vectors entry corresponding to HYP_VECTOR_DIRECT (i.e. when
neither Spectre-v2 nor Spectre-v3a are present) is unused, as we can
simply dispatch straight to __kvm_hyp_vector in this case.

Remove the redundant vector, and massage the logic for resolving a slot
to a vectors entry.

Reported-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201113113847.21619-11-will@kernel.org
This commit is contained in:
Will Deacon
2020-11-13 11:38:47 +00:00
committed by Marc Zyngier
parent cd1f56b930
commit 4f6a36fed7
3 changed files with 9 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/arm64/include/asm/spectre.h
+1 -1
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@@ -10,7 +10,7 @@
#define __ASM_SPECTRE_H
#define BP_HARDEN_EL2_SLOTS 4
#define __BP_HARDEN_HYP_VECS_SZ (BP_HARDEN_EL2_SLOTS * SZ_2K)
#define __BP_HARDEN_HYP_VECS_SZ ((BP_HARDEN_EL2_SLOTS - 1) * SZ_2K)
#ifndef __ASSEMBLY__
arch/arm64/kvm/arm.c
+8 -1
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@@ -1298,9 +1298,16 @@ 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)
{
hyp_spectre_vector_selector[slot] = base + (slot * SZ_2K);
int idx = __kvm_vector_slot2idx(slot);
hyp_spectre_vector_selector[slot] = base + (idx * SZ_2K);
}
static int kvm_init_vector_slots(void)
arch/arm64/kvm/hyp/hyp-entry.S
-1
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@@ -239,7 +239,6 @@ SYM_CODE_END(__kvm_hyp_vector)
.align 11
SYM_CODE_START(__bp_harden_hyp_vecs)
generate_vectors indirect = 0, spectrev2 = 0 // HYP_VECTOR_DIRECT
generate_vectors indirect = 0, spectrev2 = 1 // HYP_VECTOR_SPECTRE_DIRECT
generate_vectors indirect = 1, spectrev2 = 0 // HYP_VECTOR_INDIRECT
generate_vectors indirect = 1, spectrev2 = 1 // HYP_VECTOR_SPECTRE_INDIRECT