From: Oliver Upton <oliver.upton@linux.dev>
To: Marc Zyngier <maz@kernel.org>
Cc: kvmarm@lists.linux.dev, kvm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Joey Gouly <joey.gouly@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Eric Auger <eric.auger@redhat.com>,
Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>
Subject: Re: [PATCH v3 02/17] KVM: arm64: nv: Allocate VNCR page when required
Date: Fri, 9 May 2025 03:11:16 -0700 [thread overview]
Message-ID: <aB3UxDxwXhz5iY9J@linux.dev> (raw)
In-Reply-To: <20250423151508.2961768-3-maz@kernel.org>
On Wed, Apr 23, 2025 at 04:14:53PM +0100, Marc Zyngier wrote:
> If running a NV guest on an ARMv8.4-NV capable system, let's
> allocate an additional page that will be used by the hypervisor
> to fulfill system register accesses.
>
> Reviewed-by: Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>
> Signed-off-by: Marc Zyngier <maz@kernel.org>
> ---
> arch/arm64/kvm/nested.c | 9 +++++++++
> arch/arm64/kvm/reset.c | 1 +
> 2 files changed, 10 insertions(+)
>
> diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c
> index 4a3fc11f7ecf3..884b3e25795c4 100644
> --- a/arch/arm64/kvm/nested.c
> +++ b/arch/arm64/kvm/nested.c
> @@ -55,6 +55,12 @@ int kvm_vcpu_init_nested(struct kvm_vcpu *vcpu)
> !cpus_have_final_cap(ARM64_HAS_HCR_NV1))
> return -EINVAL;
>
> + if (!vcpu->arch.ctxt.vncr_array)
> + vcpu->arch.ctxt.vncr_array = (u64 *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
Think you want GFP_KERNEL_ACCOUNT here.
Thanks,
Oliver
next prev parent reply other threads:[~2025-05-09 10:54 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-23 15:14 [PATCH v3 00/17] KVM: arm64: Recursive NV support Marc Zyngier
2025-04-23 15:14 ` [PATCH v3 01/17] arm64: sysreg: Add layout for VNCR_EL2 Marc Zyngier
2025-04-23 15:14 ` [PATCH v3 02/17] KVM: arm64: nv: Allocate VNCR page when required Marc Zyngier
2025-05-09 10:11 ` Oliver Upton [this message]
2025-05-09 15:57 ` Marc Zyngier
2025-04-23 15:14 ` [PATCH v3 03/17] KVM: arm64: nv: Extract translation helper from the AT code Marc Zyngier
2025-04-23 15:14 ` [PATCH v3 04/17] KVM: arm64: nv: Snapshot S1 ASID tagging information during walk Marc Zyngier
2025-04-23 15:14 ` [PATCH v3 05/17] KVM: arm64: nv: Move TLBI range decoding to a helper Marc Zyngier
2025-04-23 15:14 ` [PATCH v3 06/17] KVM: arm64: nv: Don't adjust PSTATE.M when L2 is nesting Marc Zyngier
2025-04-23 15:14 ` [PATCH v3 07/17] KVM: arm64: nv: Add pseudo-TLB backing VNCR_EL2 Marc Zyngier
2025-04-23 15:14 ` [PATCH v3 08/17] KVM: arm64: nv: Add userspace and guest handling of VNCR_EL2 Marc Zyngier
2025-04-23 15:15 ` [PATCH v3 09/17] KVM: arm64: nv: Handle VNCR_EL2-triggered faults Marc Zyngier
2025-04-23 15:15 ` [PATCH v3 10/17] KVM: arm64: nv: Handle mapping of VNCR_EL2 at EL2 Marc Zyngier
2025-04-23 15:15 ` [PATCH v3 11/17] KVM: arm64: nv: Handle VNCR_EL2 invalidation from MMU notifiers Marc Zyngier
2025-04-23 15:15 ` [PATCH v3 12/17] KVM: arm64: nv: Program host's VNCR_EL2 to the fixmap address Marc Zyngier
2025-04-23 15:15 ` [PATCH v3 13/17] KVM: arm64: nv: Add S1 TLB invalidation primitive for VNCR_EL2 Marc Zyngier
2025-04-23 15:15 ` [PATCH v3 14/17] KVM: arm64: nv: Plumb TLBI S1E2 into system instruction dispatch Marc Zyngier
2025-04-23 15:15 ` [PATCH v3 15/17] KVM: arm64: nv: Remove dead code from ERET handling Marc Zyngier
2025-04-23 15:15 ` [PATCH v3 16/17] KVM: arm64: Allow userspace to request KVM_ARM_VCPU_EL2* Marc Zyngier
2025-04-23 15:15 ` [PATCH v3 17/17] KVM: arm64: Document NV caps and vcpu flags Marc Zyngier
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