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From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.linux.dev, kvm@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Cc: Alexandru Elisei <alexandru.elisei@arm.com>,
	Andre Przywara <andre.przywara@arm.com>,
	Chase Conklin <chase.conklin@arm.com>,
	Christoffer Dall <christoffer.dall@arm.com>,
	Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>,
	Darren Hart <darren@os.amperecomputing.com>,
	Jintack Lim <jintack@cs.columbia.edu>,
	Russell King <rmk+kernel@armlinux.org.uk>,
	Miguel Luis <miguel.luis@oracle.com>,
	James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Oliver Upton <oliver.upton@linux.dev>,
	Zenghui Yu <yuzenghui@huawei.com>
Subject: [PATCH v9 34/50] KVM: arm64: nv: Allow userspace to request KVM_ARM_VCPU_NESTED_VIRT
Date: Wed,  5 Apr 2023 16:39:52 +0100	[thread overview]
Message-ID: <20230405154008.3552854-35-maz@kernel.org> (raw)
In-Reply-To: <20230405154008.3552854-1-maz@kernel.org>

Since we're (almost) feature complete, let's allow userspace to
request KVM_ARM_VCPU_NESTED_VIRT by bumping the KVM_VCPU_MAX_FEATURES
up. We also now advertise the feature to userspace with a new capability.

It's going to be great...

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/include/asm/kvm_host.h | 2 +-
 arch/arm64/kvm/arm.c              | 3 +++
 include/uapi/linux/kvm.h          | 1 +
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 1b3902d2470f..03268d444801 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -37,7 +37,7 @@
 
 #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
 
-#define KVM_VCPU_MAX_FEATURES 7
+#define KVM_VCPU_MAX_FEATURES 8
 
 #define KVM_REQ_SLEEP \
 	KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index e4a77fe1cfa4..6af9fdf9b44d 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -272,6 +272,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_ARM_EL1_32BIT:
 		r = cpus_have_const_cap(ARM64_HAS_32BIT_EL1);
 		break;
+	case KVM_CAP_ARM_EL2:
+		r = cpus_have_const_cap(ARM64_HAS_NESTED_VIRT);
+		break;
 	case KVM_CAP_GUEST_DEBUG_HW_BPS:
 		r = get_num_brps();
 		break;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 6a7e1a0ecf04..70ac878cf99f 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1185,6 +1185,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_DIRTY_LOG_RING_WITH_BITMAP 225
 #define KVM_CAP_PMU_EVENT_MASKED_EVENTS 226
 #define KVM_CAP_COUNTER_OFFSET 227
+#define KVM_CAP_ARM_EL2 228
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
-- 
2.34.1


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  parent reply	other threads:[~2023-04-05 15:42 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-04-05 15:39 [PATCH v9 00/50] KVM: arm64: ARMv8.3/8.4 Nested Virtualization support Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 01/50] KVM: arm64: nv: Add non-VHE-EL2->EL1 translation helpers Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 02/50] KVM: arm64: nv: Handle virtual EL2 registers in vcpu_read/write_sys_reg() Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 03/50] KVM: arm64: nv: Handle SPSR_EL2 specially Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 04/50] KVM: arm64: nv: Handle HCR_EL2.E2H specially Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 05/50] KVM: arm64: nv: Save/Restore vEL2 sysregs Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 06/50] KVM: arm64: nv: Trap EL1 VM register accesses in virtual EL2 Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 07/50] KVM: arm64: nv: Trap CPACR_EL1 access " Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 08/50] KVM: arm64: nv: Respect virtual HCR_EL2.TWX setting Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 09/50] KVM: arm64: nv: Respect virtual CPTR_EL2.{TFP,FPEN} settings Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 10/50] KVM: arm64: nv: Respect the virtual HCR_EL2.NV bit setting Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 11/50] KVM: arm64: nv: Respect virtual HCR_EL2.TVM and TRVM settings Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 12/50] KVM: arm64: nv: Respect the virtual HCR_EL2.NV1 bit setting Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 13/50] KVM: arm64: nv: Forward debug traps to the nested guest Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 14/50] KVM: arm64: nv: Configure HCR_EL2 for nested virtualization Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 15/50] KVM: arm64: nv: Support multiple nested Stage-2 mmu structures Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 16/50] KVM: arm64: nv: Implement nested Stage-2 page table walk logic Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 17/50] KVM: arm64: nv: Handle shadow stage 2 page faults Marc Zyngier
2023-05-02  9:35   ` Ganapatrao Kulkarni
2023-04-05 15:39 ` [PATCH v9 18/50] KVM: arm64: nv: Restrict S2 RD/WR permissions to match the guest's Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 19/50] KVM: arm64: nv: Unmap/flush shadow stage 2 page tables Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 20/50] KVM: arm64: nv: Set a handler for the system instruction traps Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 21/50] KVM: arm64: nv: Trap and emulate AT instructions from virtual EL2 Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 22/50] KVM: arm64: nv: Trap and emulate TLBI " Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 23/50] KVM: arm64: nv: Fold guest's HCR_EL2 configuration into the host's Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 24/50] KVM: arm64: nv: Hide RAS from nested guests Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 25/50] KVM: arm64: nv: Add handling of EL2-specific timer registers Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 26/50] KVM: arm64: nv: Forward timer traps to nested EL2 Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 27/50] KVM: arm64: nv: Load timer before the GIC Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 28/50] KVM: arm64: nv: Nested GICv3 Support Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 29/50] KVM: arm64: nv: Don't load the GICv4 context on entering a nested guest Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 30/50] KVM: arm64: nv: vgic: Emulate the HW bit in software Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 31/50] KVM: arm64: nv: vgic: Allow userland to set VGIC maintenance IRQ Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 32/50] KVM: arm64: nv: Implement maintenance interrupt forwarding Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 33/50] KVM: arm64: nv: Deal with broken VGIC on maintenance interrupt delivery Marc Zyngier
2023-04-05 15:39 ` Marc Zyngier [this message]
2023-04-05 15:39 ` [PATCH v9 35/50] KVM: arm64: nv: Add handling of FEAT_TTL TLB invalidation Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 36/50] KVM: arm64: nv: Invalidate TLBs based on shadow S2 TTL-like information Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 37/50] KVM: arm64: nv: Tag shadow S2 entries with nested level Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 38/50] KVM: arm64: nv: Add include containing the VNCR_EL2 offsets Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 39/50] KVM: arm64: nv: Map VNCR-capable registers to a separate page Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 40/50] KVM: arm64: nv: Move nested vgic state into the sysreg file Marc Zyngier
2023-04-05 15:39 ` [PATCH v9 41/50] KVM: arm64: Add FEAT_NV2 cpu feature Marc Zyngier
2023-04-05 15:40 ` [PATCH v9 42/50] KVM: arm64: nv: Sync nested timer state with FEAT_NV2 Marc Zyngier
2023-04-05 15:40 ` [PATCH v9 43/50] KVM: arm64: nv: Fold GICv3 host trapping requirements into guest setup Marc Zyngier
2023-04-05 15:40 ` [PATCH v9 44/50] KVM: arm64: nv: Publish emulated timer interrupt state in the in-memory state Marc Zyngier
2023-04-05 15:40 ` [PATCH v9 45/50] KVM: arm64: nv: Allocate VNCR page when required Marc Zyngier
2023-04-05 15:40 ` [PATCH v9 46/50] KVM: arm64: nv: Enable ARMv8.4-NV support Marc Zyngier
2023-04-05 15:40 ` [PATCH v9 47/50] KVM: arm64: nv: Fast-track 'InHost' exception returns Marc Zyngier
2023-04-05 15:40 ` [PATCH v9 48/50] KVM: arm64: nv: Fast-track EL1 TLBIs for VHE guests Marc Zyngier
2023-04-05 15:40 ` [PATCH v9 49/50] KVM: arm64: nv: Use FEAT_ECV to trap access to EL0 timers Marc Zyngier
2023-04-05 15:40 ` [PATCH v9 50/50] KVM: arm64: nv: Accelerate EL0 timer read accesses when FEAT_ECV is on Marc Zyngier

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