[PATCH 2/2] KVM: arm64: Minor optimization of range_is_memory
From: David Brazdil <hidden>
Date: 2021-07-28 15:32:49
Also in:
kvmarm, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
Currently range_is_memory finds the corresponding struct memblock_region for both the lower and upper bounds of the given address range with two rounds of binary search, and then checks that the two memblocks are the same. Simplify this by only doing binary search on the lower bound and then checking that the upper bound is in the same memblock. Signed-off-by: David Brazdil <redacted> --- arch/arm64/kvm/hyp/nvhe/mem_protect.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
index a6ce991b1467..37d73af69634 100644
--- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c
+++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c@@ -189,13 +189,18 @@ static bool find_mem_range(phys_addr_t addr, struct kvm_mem_range *range) return false; } +static bool is_in_mem_range(phys_addr_t addr, struct kvm_mem_range *range) +{ + return range->start <= addr && addr < range->end; +} + static bool range_is_memory(u64 start, u64 end) { - struct kvm_mem_range r1, r2; + struct kvm_mem_range r; - if (!find_mem_range(start, &r1) || !find_mem_range(end - 1, &r2)) + if (!find_mem_range(start, &r)) return false; - if (r1.start != r2.start) + if (!is_in_mem_range(end - 1, &r)) return false; return true;
--
2.32.0.432.gabb21c7263-goog
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