From: Vincent Donnefort <vdonnefort@google.com>
To: maz@kernel.org, oupton@kernel.org, kvmarm@lists.linux.dev,
linux-arm-kernel@lists.infradead.org
Cc: joey.gouly@arm.com, seiden@linux.ibm.com, suzuki.poulose@arm.com,
yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org,
kernel-team@android.com, fuad.tabba@linux.dev,
qperret@google.com, weilin.chang@arm.com,
Vincent Donnefort <vdonnefort@google.com>
Subject: [PATCH v2 11/22] KVM: arm64: Add a range to __pkvm_guest_unshare_host()
Date: Fri, 11 Sep 2026 14:50:42 +0100 [thread overview]
Message-ID: <20260911135053.146435-12-vdonnefort@google.com> (raw)
In-Reply-To: <20260911135053.146435-1-vdonnefort@google.com>
In preparation for supporting stage-2 huge mappings for protected VMs,
add a nr_pages argument to the __pkvm_guest_unshare_host() hypercall.
This range supports only two values: 1 or PMD_SIZE / PAGE_SIZE (that is
512 on a 4K-pages system).
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
---
arch/arm64/kvm/hyp/include/nvhe/mem_protect.h | 2 +-
arch/arm64/kvm/hyp/nvhe/mem_protect.c | 22 +++++++++++--------
arch/arm64/kvm/hyp/nvhe/pkvm.c | 2 +-
3 files changed, 15 insertions(+), 11 deletions(-)
diff --git a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
index b00a14c5ed9d..33f2d1824614 100644
--- a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
+++ b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
@@ -33,7 +33,7 @@ enum pkvm_component_id {
int __pkvm_prot_finalize(void);
int __pkvm_host_share_hyp(u64 pfn, u64 nr_pages);
int __pkvm_guest_share_host(struct pkvm_hyp_vcpu *vcpu, u64 gfn, u64 nr_pages);
-int __pkvm_guest_unshare_host(struct pkvm_hyp_vcpu *vcpu, u64 gfn);
+int __pkvm_guest_unshare_host(struct pkvm_hyp_vcpu *vcpu, u64 gfn, u64 nr_pages);
int __pkvm_host_unshare_hyp(u64 pfn, u64 nr_pages);
int __pkvm_host_donate_hyp(u64 pfn, u64 nr_pages);
int __pkvm_hyp_donate_host(u64 pfn, u64 nr_pages);
diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
index 619dde4f576b..7e6882ce51f6 100644
--- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c
+++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
@@ -1049,31 +1049,35 @@ int __pkvm_guest_share_host(struct pkvm_hyp_vcpu *vcpu, u64 gfn, u64 nr_pages)
return ret;
}
-int __pkvm_guest_unshare_host(struct pkvm_hyp_vcpu *vcpu, u64 gfn)
+int __pkvm_guest_unshare_host(struct pkvm_hyp_vcpu *vcpu, u64 gfn, u64 nr_pages)
{
struct pkvm_hyp_vm *vm = pkvm_hyp_vcpu_to_hyp_vm(vcpu);
- u64 meta, phys, ipa = hyp_pfn_to_phys(gfn);
+ u64 size, meta, phys, ipa = hyp_pfn_to_phys(gfn);
kvm_pte_t pte;
int ret;
+ ret = __guest_check_transition_size(0, ipa, nr_pages, &size);
+ if (ret)
+ return ret;
+
host_lock_component();
guest_lock_component(vm);
- ret = get_valid_guest_pte(vm, ipa, PAGE_SIZE, &pte, &phys);
+ ret = get_valid_guest_pte(vm, ipa, size, &pte, &phys);
if (ret)
goto unlock;
ret = -EPERM;
if (pkvm_getstate(kvm_pgtable_stage2_pte_prot(pte)) != PKVM_PAGE_SHARED_OWNED)
goto unlock;
- if (__host_check_page_state_range(phys, PAGE_SIZE, PKVM_PAGE_SHARED_BORROWED))
+ if (__host_check_page_state_range(phys, size, PKVM_PAGE_SHARED_BORROWED))
goto unlock;
ret = 0;
meta = host_stage2_encode_gfn_meta(vm, gfn);
- WARN_ON(host_stage2_set_owner_metadata_locked(phys, PAGE_SIZE,
+ WARN_ON(host_stage2_set_owner_metadata_locked(phys, size,
PKVM_ID_GUEST, meta));
- WARN_ON(kvm_pgtable_stage2_map(&vm->pgt, ipa, PAGE_SIZE, phys,
+ WARN_ON(kvm_pgtable_stage2_map(&vm->pgt, ipa, size, phys,
pkvm_mkstate(KVM_PGTABLE_PROT_RWX, PKVM_PAGE_OWNED),
&vcpu->vcpu.arch.pkvm_memcache, 0));
unlock:
@@ -1938,8 +1942,8 @@ int __pkvm_ownership_selftest(u64 pfn, u64 pgtable_pfn, unsigned long pgtable_nr
selftest_state.host = PKVM_NOPAGE;
selftest_state.guest[0] = PKVM_PAGE_OWNED;
- assert_transition_res(0, __pkvm_guest_unshare_host, vcpu, gfn);
- assert_transition_res(-EPERM, __pkvm_guest_unshare_host, vcpu, gfn);
+ assert_transition_res(0, __pkvm_guest_unshare_host, vcpu, gfn, 1);
+ assert_transition_res(-EPERM, __pkvm_guest_unshare_host, vcpu, gfn, 1);
assert_transition_res(-EPERM, __pkvm_host_donate_guest, pfn, gfn, 1, vcpu);
assert_transition_res(-EPERM, __pkvm_host_donate_guest, pfn, gfn + 1, 1, vcpu);
assert_transition_res(-EPERM, __pkvm_host_share_guest, pfn, gfn, 1, vcpu, prot);
@@ -1956,7 +1960,7 @@ int __pkvm_ownership_selftest(u64 pfn, u64 pgtable_pfn, unsigned long pgtable_nr
assert_transition_res(-EPERM, __pkvm_host_donate_guest, pfn, gfn, 1, vcpu);
assert_transition_res(-EPERM, __pkvm_host_share_guest, pfn, gfn, 1, vcpu, prot);
assert_transition_res(-EHWPOISON, __pkvm_guest_share_host, vcpu, gfn, 1);
- assert_transition_res(-EHWPOISON, __pkvm_guest_unshare_host, vcpu, gfn);
+ assert_transition_res(-EHWPOISON, __pkvm_guest_unshare_host, vcpu, gfn, 1);
selftest_state.host = PKVM_NOPAGE;
selftest_state.guest[1] = PKVM_PAGE_OWNED;
diff --git a/arch/arm64/kvm/hyp/nvhe/pkvm.c b/arch/arm64/kvm/hyp/nvhe/pkvm.c
index 8f5c87ece728..2b0b0bc3064c 100644
--- a/arch/arm64/kvm/hyp/nvhe/pkvm.c
+++ b/arch/arm64/kvm/hyp/nvhe/pkvm.c
@@ -1132,7 +1132,7 @@ static void pkvm_memunshare_call(u64 *ret, struct kvm_vcpu *vcpu)
return;
hyp_vcpu = container_of(vcpu, struct pkvm_hyp_vcpu, vcpu);
- if (!__pkvm_guest_unshare_host(hyp_vcpu, hyp_phys_to_pfn(ipa)))
+ if (!__pkvm_guest_unshare_host(hyp_vcpu, hyp_phys_to_pfn(ipa), 1))
ret[0] = SMCCC_RET_SUCCESS;
}
--
2.55.0.1007.g17ff1f9808-goog
next prev parent reply other threads:[~2026-09-11 13:51 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-11 13:50 [PATCH v2 00/22] Huge mapping support for protected VMs Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 01/22] KVM: arm64: Prefault host stage-2 entries on block split Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 02/22] KVM: arm64: Propagate host stage-2 annotated " Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 03/22] KVM: arm64: Allow block-level stage-2 annotation Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 04/22] KVM: arm64: Use block-level annotations when setting up the host stage-2 Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 05/22] KVM: arm64: Make pKVM ownership selftest an HVC Vincent Donnefort
2026-09-11 14:14 ` sashiko-bot
2026-09-11 13:50 ` [PATCH v2 06/22] KVM: arm64: Add a range to __pkvm_host_share/unshare_hyp() Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 07/22] KVM: arm64: Add a range to __pkvm_host_donate_guest() Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 08/22] KVM: arm64: Add a range to hyp_poison_page() Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 09/22] KVM: arm64: Add a range to __pkvm_host_reclaim_guest() Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 10/22] KVM: arm64: Add a range to __pkvm_guest_share_host() Vincent Donnefort
2026-09-11 13:50 ` Vincent Donnefort [this message]
2026-09-11 13:50 ` [PATCH v2 12/22] KVM: arm64: Handle huge mappings in __pkvm_host_force_reclaim_page_guest() Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 13/22] KVM: arm64: Handle huge mappings in __pkvm_vcpu_in_poison_fault() Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 14/22] KVM: arm64: Add a range to pKVM ownership selftest Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 15/22] KVM: arm64: Warn on pKVM guest stage-2 block collapse Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 16/22] KVM: arm64: Add pkvm_hyp_req infrastructure Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 17/22] KVM: arm64: Introduce kvm_pgtable_stage2_table_install() Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 18/22] KVM: arm64: Add __pkvm_host_split_guest HVC Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 19/22] KVM: arm64: Extend pKVM page ownership selftests to cover guest block split Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 20/22] KVM: arm64: Add PKVM_HYP_REQ_SPLIT Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 21/22] KVM: arm64: Raise PKVM_HYP_REQ_SPLIT on guest to host sharing Vincent Donnefort
2026-09-11 13:50 ` [PATCH v2 22/22] KVM: arm64: Stage-2 huge mappings for protected VMs Vincent Donnefort
2026-09-11 14:20 ` sashiko-bot
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