Linux Confidential Computing Development
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From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: kvm@vger.kernel.org, kvmarm@lists.linux.dev
Cc: maz@kernel.org, will@kernel.org, catalin.marinas@arm.com,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, steven.price@arm.com,
	aneesh.kumar@kernel.org, oupton@kernel.org, gshan@redhat.com,
	joey.gouly@arm.com, tabba@google.com, yuzenghui@huawei.com,
	linux-coco@lists.linux.dev, gankulkarni@os.amperecomputing.com,
	sdonthineni@nvidia.com, alpergun@google.com,
	fj0570is@fujitsu.com, WeiLin.Chang@arm.com,
	lpieralisi@kernel.org, enju.kohei@fujitsu.com,
	Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH v17 09/20] KVM: arm64: coco: arch_timer: Prevent timer offset configuration
Date: Tue,  8 Sep 2026 17:22:12 +0100	[thread overview]
Message-ID: <20260908162223.1683432-10-suzuki.poulose@arm.com> (raw)
In-Reply-To: <20260908162223.1683432-1-suzuki.poulose@arm.com>

Confidential guests, including protected PKVM guests and Arm CCA Realms, always
runs with 0 timer offset. Prevent the configuration for them.

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 arch/arm64/kvm/arch_timer.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/kvm/arch_timer.c b/arch/arm64/kvm/arch_timer.c
index 6ac3321f4c575..eba84cab95d01 100644
--- a/arch/arm64/kvm/arch_timer.c
+++ b/arch/arm64/kvm/arch_timer.c
@@ -1079,7 +1079,7 @@ static void timer_context_init(struct kvm_vcpu *vcpu, int timerid)
 
 	ctxt->timer_id = timerid;
 
-	if (!kvm_vm_is_protected(vcpu->kvm)) {
+	if (!vcpu_is_confidential(vcpu)) {
 		if (timerid == TIMER_VTIMER)
 			ctxt->offset.vm_offset = &kvm->arch.timer_data.voffset;
 		else
@@ -1110,7 +1110,7 @@ void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu)
 		timer_context_init(vcpu, i);
 
 	/* Synchronize offsets across timers of a VM if not already provided */
-	if (!vcpu_is_protected(vcpu) &&
+	if (!vcpu_is_confidential(vcpu) &&
 	    !test_bit(KVM_ARCH_FLAG_VM_COUNTER_OFFSET, &vcpu->kvm->arch.flags)) {
 		timer_set_offset(vcpu_vtimer(vcpu), kvm_phys_timer_read());
 		timer_set_offset(vcpu_ptimer(vcpu), 0);
@@ -1736,7 +1736,7 @@ int kvm_vm_ioctl_set_counter_offset(struct kvm *kvm,
 	if (offset->reserved)
 		return -EINVAL;
 
-	if (kvm_vm_is_protected(kvm))
+	if (kvm_vm_is_confidential(kvm))
 		return -EINVAL;
 
 	mutex_lock(&kvm->lock);
-- 
2.43.0


  parent reply	other threads:[~2026-09-08 16:23 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-08 16:22 [PATCH v17 00/20] KVM: arm64: CCA: Add basic plumbing for Realms Suzuki K Poulose
2026-09-08 16:22 ` [PATCH v17 01/20] KVM: arm64: Include kvm_emulate.h in kvm/arm_psci.h Suzuki K Poulose
2026-09-09 11:20   ` Fuad Tabba
2026-09-08 16:22 ` [PATCH v17 02/20] KVM: arm64: Avoid including linux/kvm_host.h in kvm_pgtable.h Suzuki K Poulose
2026-09-09 11:22   ` Fuad Tabba
2026-09-09 11:24     ` Suzuki K Poulose
2026-09-10  3:40   ` Gavin Shan
2026-09-08 16:22 ` [PATCH v17 03/20] KVM: arm64: Track the type of VM in kvm_arch Suzuki K Poulose
2026-09-09 11:28   ` Fuad Tabba
2026-09-09 11:30     ` Suzuki K Poulose
2026-09-10  3:39   ` Gavin Shan
2026-09-10  6:35     ` Suzuki K Poulose
2026-09-08 16:22 ` [PATCH v17 04/20] KVM: arm64: Refactor the vcpu_load to allow for VM specific callbacks Suzuki K Poulose
2026-09-10  4:00   ` Gavin Shan
2026-09-10 10:21     ` Suzuki K Poulose
2026-09-08 16:22 ` [PATCH v17 05/20] KVM: arm64: Add vcpu load/put call backs for flavors Suzuki K Poulose
2026-09-10  5:33   ` Gavin Shan
2026-09-10  8:40     ` Suzuki K Poulose
2026-09-08 16:22 ` [PATCH v17 06/20] KVM: arm64: CCA: Add a new mode for supporting Realm guests Suzuki K Poulose
2026-09-09  3:26   ` Kohei Enju
2026-09-09 10:48     ` Marc Zyngier
2026-09-10  4:49       ` Kohei Enju
2026-09-10  5:53   ` Gavin Shan
2026-09-10  8:43     ` Suzuki K Poulose
2026-09-10  9:40       ` Gavin Shan
2026-09-08 16:22 ` [PATCH v17 07/20] KVM: arm64: CCA: Introduce Realms Suzuki K Poulose
2026-09-08 16:22 ` [PATCH v17 08/20] KVM: arm64: coco: Add a helper to check if a VM is confidential compute guest Suzuki K Poulose
2026-09-08 16:22 ` Suzuki K Poulose [this message]
2026-09-08 16:22 ` [PATCH v17 10/20] KVM: arm64: coco: Disable Steal time accounting for coco guests Suzuki K Poulose
2026-09-09 11:45   ` Fuad Tabba
2026-09-09 11:52     ` Suzuki K Poulose
2026-09-09 12:23       ` Fuad Tabba
2026-09-10 10:27         ` Suzuki K Poulose
2026-09-10 12:42           ` Fuad Tabba
2026-09-10 12:44             ` Suzuki K Poulose
2026-09-08 16:22 ` [PATCH v17 11/20] KVM: arm64: coco: Don't handle MMIO with no ISV Suzuki K Poulose
2026-09-08 16:22 ` [PATCH v17 12/20] KVM: arm64: CCA: Support timers in realm RECs Suzuki K Poulose
2026-09-08 16:22 ` [PATCH v17 13/20] KVM: arm64: CCA: Add VCPU load/put for Realms Suzuki K Poulose
2026-09-08 16:22 ` [PATCH v17 14/20] KVM: arm64: CCA: Don't expose unsupported capabilities for realm guests Suzuki K Poulose
2026-09-08 16:22 ` [PATCH v17 15/20] KVM: arm64: CCA: WARN on injected undef exceptions Suzuki K Poulose
2026-09-08 16:22 ` [PATCH v17 16/20] KVM: arm64: CCA: Provide register list for unfinalized RECs Suzuki K Poulose
2026-09-08 16:22 ` [PATCH v17 17/20] KVM: arm64: CCA: Provide an accurate register list Suzuki K Poulose
2026-09-08 16:22 ` [PATCH v17 18/20] KVM: arm64: Reuse kvm_stage2_unmap_range in kvm_unmap_gfn_range Suzuki K Poulose
2026-09-09 11:50   ` Fuad Tabba
2026-09-08 16:22 ` [PATCH v17 19/20] KVM: arm64: Add VM specific callback for S2 MMU operations Suzuki K Poulose
2026-09-08 16:22 ` [PATCH v17 20/20] KVM: arm64: Abstract out memory abort handling Suzuki K Poulose
2026-09-09 13:18 ` [PATCH v17 00/20] KVM: arm64: CCA: Add basic plumbing for Realms Fuad Tabba
2026-09-09 13:52   ` Suzuki K Poulose

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