From: Fuad Tabba <fuad.tabba@linux.dev>
To: Marc Zyngier <maz@kernel.org>, Oliver Upton <oupton@kernel.org>,
kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Joey Gouly <joey.gouly@arm.com>,
Steffen Eiden <seiden@linux.ibm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Vincent Donnefort <vdonnefort@google.com>,
Quentin Perret <qperret@google.com>,
Fuad Tabba <tabba@google.com>
Subject: [PATCH v2 16/17] KVM: arm64: Advertise the capabilities that protected VMs support
Date: Mon, 7 Sep 2026 08:00:01 +0100 [thread overview]
Message-ID: <20260907070002.3333525-17-fuad.tabba@linux.dev> (raw)
In-Reply-To: <20260907070002.3333525-1-fuad.tabba@linux.dev>
kvm_pkvm_ext_allowed() denies every capability it doesn't name, so a
protected VM reports 0 for interfaces it implements: KVM_CHECK_EXTENSION
denies KVM_CAP_ONE_REG while KVM_{GET,SET}_ONE_REG stage the guest's
boot state.
Allow the capabilities that work for a protected guest under the
restrictions the preceding patches add, the vGIC and the I/O bus being
host-managed.
Signed-off-by: Fuad Tabba <fuad.tabba@linux.dev>
---
arch/arm64/include/asm/kvm_pkvm.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_pkvm.h b/arch/arm64/include/asm/kvm_pkvm.h
index 5fec511eca733..ee3ab505b01f7 100644
--- a/arch/arm64/include/asm/kvm_pkvm.h
+++ b/arch/arm64/include/asm/kvm_pkvm.h
@@ -41,6 +41,15 @@ static inline bool kvm_pkvm_ext_allowed(struct kvm *kvm, long ext)
case KVM_CAP_ARM_VM_IPA_SIZE:
case KVM_CAP_ARM_PTRAUTH_ADDRESS:
case KVM_CAP_ARM_PTRAUTH_GENERIC:
+ case KVM_CAP_ONE_REG:
+ case KVM_CAP_MP_STATE:
+ case KVM_CAP_VCPU_EVENTS:
+ case KVM_CAP_VCPU_ATTRIBUTES:
+ case KVM_CAP_IMMEDIATE_EXIT:
+ case KVM_CAP_IOEVENTFD:
+ case KVM_CAP_IRQFD_RESAMPLE:
+ case KVM_CAP_ARM_IRQ_LINE_LAYOUT_2:
+ case KVM_CAP_ARM_INJECT_SERROR_ESR:
return true;
case KVM_CAP_ARM_MTE:
return false;
--
2.39.5
next prev parent reply other threads:[~2026-09-07 7:02 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-07 6:59 [PATCH v2 00/16] KVM: arm64: Confine protected VM vCPU state to EL2 Fuad Tabba
2026-09-07 6:59 ` [PATCH v2 01/17] KVM: arm64: Sync HCR_EL2.VSE back to the host vCPU under pKVM Fuad Tabba
2026-09-07 6:59 ` [PATCH v2 02/17] KVM: arm64: Reject the PVTIME vCPU attribute for protected VMs Fuad Tabba
2026-09-07 6:59 ` [PATCH v2 03/17] KVM: arm64: Introduce per-EC entry handlers for pKVM Fuad Tabba
2026-09-07 6:59 ` [PATCH v2 04/17] KVM: arm64: Skip fixed-feature state flush for protected vCPUs Fuad Tabba
2026-09-07 6:59 ` [PATCH v2 05/17] KVM: arm64: Add {flush,sync}_hyp_timer_state() primitives Fuad Tabba
2026-09-07 6:59 ` [PATCH v2 06/17] KVM: arm64: Add system register reset framework for protected VMs Fuad Tabba
2026-09-09 13:50 ` Joey Gouly
2026-09-10 10:05 ` Fuad Tabba
2026-09-07 6:59 ` [PATCH v2 07/17] KVM: arm64: Implement HVC handling for protected guests at EL2 Fuad Tabba
2026-09-07 6:59 ` [PATCH v2 08/17] KVM: arm64: Handle PSCI calls for protected VMs " Fuad Tabba
2026-09-07 6:59 ` [PATCH v2 09/17] KVM: arm64: Restrict KVM_ARM_VCPU_INIT and PSCI version for protected VMs Fuad Tabba
2026-09-07 6:59 ` [PATCH v2 10/17] KVM: arm64: Prevent host PC adjustments for protected vCPUs Fuad Tabba
2026-09-07 6:59 ` [PATCH v2 11/17] KVM: arm64: Inject an UNDEF at EL2 for unhandled protected guest exits Fuad Tabba
2026-09-07 6:59 ` [PATCH v2 12/17] KVM: arm64: Add per-EC entry/exit state marshalling for protected guests Fuad Tabba
2026-09-07 6:59 ` [PATCH v2 13/17] KVM: arm64: Pend a protected guest's SError with HCR_EL2.VSE only Fuad Tabba
2026-09-11 10:29 ` Marc Zyngier
2026-09-11 10:58 ` Fuad Tabba
2026-09-07 6:59 ` [PATCH v2 14/17] KVM: arm64: Reject host access to protected VM private state Fuad Tabba
2026-09-07 7:00 ` [PATCH v2 15/17] KVM: arm64: Reject host power-on of a vCPU that EL2 holds powered off Fuad Tabba
2026-09-07 7:00 ` Fuad Tabba [this message]
2026-09-07 7:00 ` [PATCH v2 17/17] KVM: arm64: Document the protected VM userspace API Fuad Tabba
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