From: Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>
To: Marc Zyngier <maz@kernel.org>,
linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org
Cc: Andre Przywara <andre.przywara@arm.com>,
Christoffer Dall <christoffer.dall@arm.com>,
Jintack Lim <jintack@cs.columbia.edu>,
Haibo Xu <haibo.xu@linaro.org>, James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
kernel-team@android.com
Subject: Re: [PATCH v5 07/69] KVM: arm64: nv: Introduce nested virtualization VCPU feature
Date: Mon, 20 Dec 2021 12:15:21 +0530 [thread overview]
Message-ID: <83f15c99-b785-ac43-e005-0d922ccc536b@os.amperecomputing.com> (raw)
In-Reply-To: <20211129200150.351436-8-maz@kernel.org>
Hi Marc,
On 30-11-2021 01:30 am, Marc Zyngier wrote:
> From: Christoffer Dall <christoffer.dall@arm.com>
>
> Introduce the feature bit and a primitive that checks if the feature is
> set behind a static key check based on the cpus_have_const_cap check.
>
> Checking nested_virt_in_use() on systems without nested virt enabled
> should have neglgible overhead.
Typo: negligible
>
> We don't yet allow userspace to actually set this feature.
>
> Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
> Signed-off-by: Marc Zyngier <maz@kernel.org>
> ---
> arch/arm64/include/asm/kvm_nested.h | 14 ++++++++++++++
> arch/arm64/include/uapi/asm/kvm.h | 1 +
> 2 files changed, 15 insertions(+)
> create mode 100644 arch/arm64/include/asm/kvm_nested.h
>
> diff --git a/arch/arm64/include/asm/kvm_nested.h b/arch/arm64/include/asm/kvm_nested.h
> new file mode 100644
> index 000000000000..1028ac65a897
> --- /dev/null
> +++ b/arch/arm64/include/asm/kvm_nested.h
> @@ -0,0 +1,14 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __ARM64_KVM_NESTED_H
> +#define __ARM64_KVM_NESTED_H
> +
> +#include <linux/kvm_host.h>
> +
> +static inline bool nested_virt_in_use(const struct kvm_vcpu *vcpu)
> +{
> + return (!__is_defined(__KVM_NVHE_HYPERVISOR__) &&
> + cpus_have_final_cap(ARM64_HAS_NESTED_VIRT) &&
> + test_bit(KVM_ARM_VCPU_HAS_EL2, vcpu->arch.features));
> +}
> +
> +#endif /* __ARM64_KVM_NESTED_H */
> diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
> index b3edde68bc3e..395a4c039bcc 100644
> --- a/arch/arm64/include/uapi/asm/kvm.h
> +++ b/arch/arm64/include/uapi/asm/kvm.h
> @@ -106,6 +106,7 @@ struct kvm_regs {
> #define KVM_ARM_VCPU_SVE 4 /* enable SVE for this CPU */
> #define KVM_ARM_VCPU_PTRAUTH_ADDRESS 5 /* VCPU uses address authentication */
> #define KVM_ARM_VCPU_PTRAUTH_GENERIC 6 /* VCPU uses generic authentication */
> +#define KVM_ARM_VCPU_HAS_EL2 7 /* Support nested virtualization */
>
> struct kvm_vcpu_init {
> __u32 target;
It looks good to me.
Please feel free to add.
Reviewed-by: Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>
Thanks,
Ganapat
next prev parent reply other threads:[~2021-12-20 6:45 UTC|newest]
Thread overview: 139+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-29 20:00 [PATCH v5 00/69] KVM: arm64: ARMv8.3/8.4 Nested Virtualization support Marc Zyngier
2021-11-29 20:00 ` [PATCH v5 01/69] KVM: arm64: Save PSTATE early on exit Marc Zyngier
2022-01-17 15:36 ` Russell King (Oracle)
2021-11-29 20:00 ` [PATCH v5 02/69] KVM: arm64: Move pkvm's special 32bit handling into a generic infrastructure Marc Zyngier
2022-01-17 15:34 ` Russell King (Oracle)
2021-11-29 20:00 ` [PATCH v5 03/69] KVM: arm64: Add minimal handling for the ARMv8.7 PMU Marc Zyngier
2022-01-17 15:40 ` Russell King (Oracle)
2021-11-29 20:00 ` [PATCH v5 04/69] KVM: arm64: Rework kvm_pgtable initialisation Marc Zyngier
2022-01-17 15:43 ` Russell King (Oracle)
2021-11-29 20:00 ` [PATCH v5 05/69] KVM: arm64: Allow preservation of the S2 SW bits Marc Zyngier
2022-01-13 12:12 ` Alexandru Elisei
2022-01-13 13:14 ` Marc Zyngier
2022-01-17 15:51 ` Russell King (Oracle)
2021-11-29 20:00 ` [PATCH v5 06/69] arm64: Add ARM64_HAS_NESTED_VIRT cpufeature Marc Zyngier
2021-11-29 20:00 ` [PATCH v5 07/69] KVM: arm64: nv: Introduce nested virtualization VCPU feature Marc Zyngier
2021-12-20 6:45 ` Ganapatrao Kulkarni [this message]
2022-01-13 14:10 ` Alexandru Elisei
2022-01-13 14:24 ` Marc Zyngier
2022-01-17 16:57 ` Russell King (Oracle)
2021-11-29 20:00 ` [PATCH v5 08/69] KVM: arm64: nv: Reset VCPU to EL2 registers if VCPU nested virt is set Marc Zyngier
2022-01-07 21:54 ` Chase Conklin
2022-01-27 12:42 ` Marc Zyngier
2022-01-17 17:06 ` Russell King (Oracle)
2022-01-27 12:43 ` Marc Zyngier
2021-11-29 20:00 ` [PATCH v5 09/69] KVM: arm64: nv: Allow userspace to set PSR_MODE_EL2x Marc Zyngier
2022-01-17 17:07 ` Russell King (Oracle)
2021-11-29 20:00 ` [PATCH v5 10/69] KVM: arm64: nv: Add EL2 system registers to vcpu context Marc Zyngier
2022-01-17 17:14 ` Russell King (Oracle)
2021-11-29 20:00 ` [PATCH v5 11/69] KVM: arm64: nv: Add nested virt VCPU primitives for vEL2 VCPU state Marc Zyngier
2022-01-14 17:42 ` Alexandru Elisei
2022-01-15 12:19 ` Marc Zyngier
2022-01-17 10:19 ` Alexandru Elisei
2022-01-18 15:45 ` Russell King (Oracle)
2021-11-29 20:00 ` [PATCH v5 12/69] KVM: arm64: nv: Handle HCR_EL2.NV system register traps Marc Zyngier
2022-01-17 11:31 ` Alexandru Elisei
2022-01-26 16:08 ` Marc Zyngier
2022-01-18 15:51 ` Russell King (Oracle)
2022-01-26 16:01 ` Marc Zyngier
2021-11-29 20:00 ` [PATCH v5 13/69] KVM: arm64: nv: Reset VMPIDR_EL2 and VPIDR_EL2 to sane values Marc Zyngier
2022-01-18 15:52 ` Russell King (Oracle)
2021-11-29 20:00 ` [PATCH v5 14/69] KVM: arm64: nv: Support virtual EL2 exceptions Marc Zyngier
2021-12-20 6:57 ` Ganapatrao Kulkarni
2022-01-18 14:11 ` Alexandru Elisei
2022-01-26 20:11 ` Marc Zyngier
2022-01-18 16:02 ` Russell King (Oracle)
2022-01-26 20:32 ` Marc Zyngier
2022-01-20 13:58 ` Alexandru Elisei
2022-01-27 11:08 ` Marc Zyngier
2021-11-29 20:00 ` [PATCH v5 15/69] KVM: arm64: nv: Inject HVC exceptions to the virtual EL2 Marc Zyngier
2022-01-18 16:04 ` Russell King (Oracle)
2022-01-18 16:35 ` Alexandru Elisei
2021-11-29 20:00 ` [PATCH v5 16/69] KVM: arm64: nv: Handle trapped ERET from " Marc Zyngier
2022-01-18 16:05 ` Russell King (Oracle)
2022-01-18 16:36 ` Alexandru Elisei
2022-01-27 11:50 ` Marc Zyngier
2021-11-29 20:00 ` [PATCH v5 17/69] KVM: arm64: nv: Add non-VHE-EL2->EL1 translation helpers Marc Zyngier
2022-01-20 11:52 ` Alexandru Elisei
2022-01-27 17:22 ` Marc Zyngier
2021-11-29 20:00 ` [PATCH v5 18/69] KVM: arm64: nv: Handle virtual EL2 registers in vcpu_read/write_sys_reg() Marc Zyngier
2021-12-20 7:04 ` Ganapatrao Kulkarni
2021-12-20 9:10 ` Marc Zyngier
2021-12-21 7:12 ` Ganapatrao Kulkarni
2021-12-21 8:39 ` Marc Zyngier
2021-12-21 10:12 ` Ganapatrao Kulkarni
2022-01-20 15:12 ` Alexandru Elisei
2021-11-29 20:01 ` [PATCH v5 19/69] KVM: arm64: nv: Handle SPSR_EL2 specially Marc Zyngier
2022-01-20 16:28 ` Alexandru Elisei
2021-11-29 20:01 ` [PATCH v5 20/69] KVM: arm64: nv: Handle HCR_EL2.E2H specially Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 21/69] KVM: arm64: nv: Save/Restore vEL2 sysregs Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 22/69] KVM: arm64: nv: Emulate PSTATE.M for a guest hypervisor Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 23/69] KVM: arm64: nv: Trap EL1 VM register accesses in virtual EL2 Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 24/69] KVM: arm64: nv: Trap SPSR_EL1, ELR_EL1 and VBAR_EL1 from " Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 25/69] KVM: arm64: nv: Trap CPACR_EL1 access in " Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 26/69] KVM: arm64: nv: Handle PSCI call via smc from the guest Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 27/69] KVM: arm64: nv: Respect virtual HCR_EL2.TWX setting Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 28/69] KVM: arm64: nv: Respect virtual CPTR_EL2.{TFP,FPEN} settings Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 29/69] KVM: arm64: nv: Respect the virtual HCR_EL2.NV bit setting Marc Zyngier
2021-12-20 7:11 ` Ganapatrao Kulkarni
2021-12-20 9:18 ` Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 30/69] KVM: arm64: nv: Respect virtual HCR_EL2.TVM and TRVM settings Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 31/69] KVM: arm64: nv: Respect the virtual HCR_EL2.NV1 bit setting Marc Zyngier
2021-12-20 7:18 ` Ganapatrao Kulkarni
2021-12-20 9:39 ` Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 32/69] KVM: arm64: nv: Emulate EL12 register accesses from the virtual EL2 Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 33/69] KVM: arm64: nv: Forward debug traps to the nested guest Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 34/69] KVM: arm64: nv: Configure HCR_EL2 for nested virtualization Marc Zyngier
2022-01-04 8:53 ` Ganapatrao Kulkarni
2022-01-04 9:39 ` Marc Zyngier
2022-01-04 9:53 ` Ganapatrao Kulkarni
2021-11-29 20:01 ` [PATCH v5 35/69] KVM: arm64: nv: Only toggle cache for virtual EL2 when SCTLR_EL2 changes Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 36/69] KVM: arm64: nv: Filter out unsupported features from ID regs Marc Zyngier
2021-12-20 7:26 ` Ganapatrao Kulkarni
2021-12-20 9:56 ` Marc Zyngier
2021-12-21 6:03 ` Ganapatrao Kulkarni
2021-12-21 9:10 ` Marc Zyngier
2021-12-21 10:07 ` Ganapatrao Kulkarni
2022-01-21 11:33 ` Ganapatrao Kulkarni
2022-01-27 13:04 ` Marc Zyngier
2022-01-04 10:24 ` Ganapatrao Kulkarni
2021-11-29 20:01 ` [PATCH v5 37/69] KVM: arm64: nv: Hide RAS from nested guests Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 38/69] KVM: arm64: nv: Support multiple nested Stage-2 mmu structures Marc Zyngier
2022-01-18 11:24 ` Ganapatrao Kulkarni
2022-01-27 11:50 ` Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 39/69] KVM: arm64: nv: Implement nested Stage-2 page table walk logic Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 40/69] KVM: arm64: nv: Handle shadow stage 2 page faults Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 41/69] KVM: arm64: nv: Restrict S2 RD/WR permissions to match the guest's Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 42/69] KVM: arm64: nv: Unmap/flush shadow stage 2 page tables Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 43/69] KVM: arm64: nv: Introduce sys_reg_desc.forward_trap Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 44/69] KVM: arm64: nv: Set a handler for the system instruction traps Marc Zyngier
2022-01-18 11:29 ` Ganapatrao Kulkarni
2021-11-29 20:01 ` [PATCH v5 45/69] KVM: arm64: nv: Trap and emulate AT instructions from virtual EL2 Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 46/69] KVM: arm64: nv: Trap and emulate TLBI " Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 47/69] KVM: arm64: nv: Fold guest's HCR_EL2 configuration into the host's Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 48/69] KVM: arm64: nv: arch_timer: Support hyp timer emulation Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 49/69] KVM: arm64: nv: Add handling of EL2-specific timer registers Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 50/69] KVM: arm64: nv: Load timer before the GIC Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 51/69] KVM: arm64: nv: Nested GICv3 Support Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 52/69] KVM: arm64: nv: Don't load the GICv4 context on entering a nested guest Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 53/69] KVM: arm64: nv: vgic: Emulate the HW bit in software Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 54/69] KVM: arm64: nv: vgic: Allow userland to set VGIC maintenance IRQ Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 55/69] KVM: arm64: nv: Implement maintenance interrupt forwarding Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 56/69] KVM: arm64: nv: Add nested GICv3 tracepoints Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 57/69] KVM: arm64: nv: Allow userspace to request KVM_ARM_VCPU_NESTED_VIRT Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 58/69] KVM: arm64: nv: Add handling of ARMv8.4-TTL TLB invalidation Marc Zyngier
2022-01-18 11:35 ` Ganapatrao Kulkarni
2021-11-29 20:01 ` [PATCH v5 59/69] KVM: arm64: nv: Invalidate TLBs based on shadow S2 TTL-like information Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 60/69] KVM: arm64: nv: Tag shadow S2 entries with nested level Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 61/69] KVM: arm64: nv: Add include containing the VNCR_EL2 offsets Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 62/69] KVM: arm64: nv: Map VNCR-capable registers to a separate page Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 63/69] KVM: arm64: nv: Move nested vgic state into the sysreg file Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 64/69] KVM: arm64: Add ARMv8.4 Enhanced Nested Virt cpufeature Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 65/69] KVM: arm64: nv: Sync nested timer state with ARMv8.4 Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 66/69] KVM: arm64: nv: Allocate VNCR page when required Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 67/69] KVM: arm64: nv: Enable ARMv8.4-NV support Marc Zyngier
2022-01-18 11:50 ` Ganapatrao Kulkarni
2022-01-27 11:48 ` Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 68/69] KVM: arm64: nv: Fast-track 'InHost' exception returns Marc Zyngier
2021-11-29 20:01 ` [PATCH v5 69/69] KVM: arm64: nv: Fast-track EL1 TLBIs for VHE guests Marc Zyngier
2021-12-16 17:19 ` (subset) [PATCH v5 00/69] KVM: arm64: ARMv8.3/8.4 Nested Virtualization support Marc Zyngier
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