From: Quentin Perret <qperret@google.com>
To: Marc Zyngier <maz@kernel.org>, James Morse <james.morse@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Fuad Tabba <tabba@google.com>,
David Brazdil <dbrazdil@google.com>
Cc: linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
kernel-team@android.com
Subject: [PATCH 06/16] KVM: arm64: Provide {get,put}_page() stubs for early hyp allocator
Date: Wed, 13 Oct 2021 16:58:21 +0100 [thread overview]
Message-ID: <20211013155831.943476-7-qperret@google.com> (raw)
In-Reply-To: <20211013155831.943476-1-qperret@google.com>
In nVHE protected mode, the EL2 code uses a temporary allocator during
boot while re-creating its stage-1 page-table. Unfortunately, the
hyp_vmmemap is not ready to use at this stage, so refcounting pages
is not possible. That is not currently a problem because hyp stage-1
mappings are never removed, which implies refcounting of page-table
pages is unnecessary.
In preparation for allowing hypervisor stage-1 mappings to be removed,
provide stub implementations for {get,put}_page() in the early allocator.
Signed-off-by: Quentin Perret <qperret@google.com>
---
arch/arm64/kvm/hyp/nvhe/early_alloc.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/arm64/kvm/hyp/nvhe/early_alloc.c b/arch/arm64/kvm/hyp/nvhe/early_alloc.c
index 1306c430ab87..00de04153cc6 100644
--- a/arch/arm64/kvm/hyp/nvhe/early_alloc.c
+++ b/arch/arm64/kvm/hyp/nvhe/early_alloc.c
@@ -43,6 +43,9 @@ void *hyp_early_alloc_page(void *arg)
return hyp_early_alloc_contig(1);
}
+static void hyp_early_alloc_get_page(void *addr) { }
+static void hyp_early_alloc_put_page(void *addr) { }
+
void hyp_early_alloc_init(void *virt, unsigned long size)
{
base = cur = (unsigned long)virt;
@@ -51,4 +54,6 @@ void hyp_early_alloc_init(void *virt, unsigned long size)
hyp_early_alloc_mm_ops.zalloc_page = hyp_early_alloc_page;
hyp_early_alloc_mm_ops.phys_to_virt = hyp_phys_to_virt;
hyp_early_alloc_mm_ops.virt_to_phys = hyp_virt_to_phys;
+ hyp_early_alloc_mm_ops.get_page = hyp_early_alloc_get_page;
+ hyp_early_alloc_mm_ops.put_page = hyp_early_alloc_put_page;
}
--
2.33.0.882.g93a45727a2-goog
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next prev parent reply other threads:[~2021-10-13 16:02 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-13 15:58 [PATCH 00/16] KVM: arm64: Implement unshare hypercall for pkvm Quentin Perret
2021-10-13 15:58 ` [PATCH 01/16] KVM: arm64: Introduce do_share() helper for memory sharing between components Quentin Perret
2021-10-15 15:11 ` Andrew Walbran
2021-10-19 10:37 ` Quentin Perret
2021-10-13 15:58 ` [PATCH 02/16] KVM: arm64: Implement __pkvm_host_share_hyp() using do_share() Quentin Perret
2021-10-13 15:58 ` [PATCH 03/16] KVM: arm64: Avoid remapping the SVE state in the hyp stage-1 Quentin Perret
2021-10-16 11:04 ` Marc Zyngier
2021-10-18 10:36 ` Quentin Perret
2021-10-13 15:58 ` [PATCH 04/16] KVM: arm64: Introduce kvm_share_hyp() Quentin Perret
2021-10-17 10:41 ` Marc Zyngier
2021-10-18 10:51 ` Quentin Perret
2021-10-13 15:58 ` [PATCH 05/16] KVM: arm64: Accept page ranges in pkvm share hypercall Quentin Perret
2021-10-13 15:58 ` Quentin Perret [this message]
2021-10-13 15:58 ` [PATCH 07/16] KVM: arm64: Refcount hyp stage-1 pgtable pages Quentin Perret
2021-10-13 15:58 ` [PATCH 08/16] KVM: arm64: Fixup hyp stage-1 refcount Quentin Perret
2021-10-13 15:58 ` [PATCH 09/16] KVM: arm64: Hook up ->page_count() for hypervisor stage-1 page-table Quentin Perret
2021-10-13 15:58 ` [PATCH 10/16] KVM: arm64: Implement kvm_pgtable_hyp_unmap() at EL2 Quentin Perret
2021-10-13 15:58 ` [PATCH 11/16] KVM: arm64: Back hyp_vmemmap for all of memory Quentin Perret
2021-10-13 15:58 ` [PATCH 12/16] KVM: arm64: Move hyp refcount helpers to header files Quentin Perret
2021-10-13 15:58 ` [PATCH 13/16] KVM: arm64: Move double-sharing logic into hyp-specific function Quentin Perret
2021-10-13 15:58 ` [PATCH 14/16] KVM: arm64: Refcount shared pages at EL2 Quentin Perret
2021-10-13 15:58 ` [PATCH 15/16] KVM: arm64: pkvm: Introduce an unshare hypercall Quentin Perret
2021-10-13 15:58 ` [PATCH 16/16] KVM: arm64: pkvm: Unshare guest structs during teardown Quentin Perret
2021-10-16 12:25 ` Marc Zyngier
2021-10-18 10:32 ` Quentin Perret
2021-10-18 14:03 ` Quentin Perret
2021-10-18 17:12 ` Marc Zyngier
2021-10-19 9:40 ` Quentin Perret
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