linux-kernel - [PATCH v9 22/30] KVM: arm64: Support unaligned fixmap in the pKVM hyp

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Message-ID: <20251202093623.2337860-23-vdonnefort@google.com>
Date: Tue,  2 Dec 2025 09:36:15 +0000
From: Vincent Donnefort <vdonnefort@...gle.com>
To: rostedt@...dmis.org, mhiramat@...nel.org, mathieu.desnoyers@...icios.com, 
	linux-trace-kernel@...r.kernel.org, maz@...nel.org, oliver.upton@...ux.dev, 
	joey.gouly@....com, suzuki.poulose@....com, yuzenghui@...wei.com
Cc: kvmarm@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
	jstultz@...gle.com, qperret@...gle.com, will@...nel.org, 
	aneesh.kumar@...nel.org, kernel-team@...roid.com, 
	linux-kernel@...r.kernel.org, Vincent Donnefort <vdonnefort@...gle.com>
Subject: [PATCH v9 22/30] KVM: arm64: Support unaligned fixmap in the pKVM hyp

Return the fixmap VA with the page offset, instead of the page base
address. This allows to use hyp_fixmap_map() seamlessly regardless of
the address alignment. While at it, do the same for hyp_fixblock_map().

Signed-off-by: Vincent Donnefort <vdonnefort@...gle.com>

diff --git a/arch/arm64/kvm/hyp/nvhe/mm.c b/arch/arm64/kvm/hyp/nvhe/mm.c
index ae8391baebc3..a6eafd72f87c 100644
--- a/arch/arm64/kvm/hyp/nvhe/mm.c
+++ b/arch/arm64/kvm/hyp/nvhe/mm.c
@@ -244,7 +244,7 @@ static void *fixmap_map_slot(struct hyp_fixmap_slot *slot, phys_addr_t phys)
 
 void *hyp_fixmap_map(phys_addr_t phys)
 {
-	return fixmap_map_slot(this_cpu_ptr(&fixmap_slots), phys);
+	return fixmap_map_slot(this_cpu_ptr(&fixmap_slots), phys) + offset_in_page(phys);
 }
 
 static void fixmap_clear_slot(struct hyp_fixmap_slot *slot)
@@ -366,7 +366,7 @@ void *hyp_fixblock_map(phys_addr_t phys, size_t *size)
 #ifdef HAS_FIXBLOCK
 	*size = PMD_SIZE;
 	hyp_spin_lock(&hyp_fixblock_lock);
-	return fixmap_map_slot(&hyp_fixblock_slot, phys);
+	return fixmap_map_slot(&hyp_fixblock_slot, phys) + offset_in_page(phys);
 #else
 	*size = PAGE_SIZE;
 	return hyp_fixmap_map(phys);
-- 
2.52.0.107.ga0afd4fd5b-goog