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From: cdall@linaro.org (Christoffer Dall)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC 54/55] KVM: arm/arm64: Adjust virtual offset considering nesting
Date: Wed, 22 Feb 2017 20:28:38 +0100	[thread overview]
Message-ID: <20170222192838.GY26976@cbox> (raw)
In-Reply-To: <1483943091-1364-55-git-send-email-jintack@cs.columbia.edu>

Hi Jintack,

On Mon, Jan 09, 2017 at 01:24:50AM -0500, Jintack Lim wrote:
> The guest hypervisor sets cntvoff_el2 for its VM (i.e. nested VM).  Note
> that physical/virtual counter value in the guest hypervisor's point of
> view is already offsetted by the virtual offset set by the host
> hypervisor.  Therefore, the correct offset we need to write to the
> cntvoff_el2 is the sum of offset the host hypervisor initially has for
> the VM and virtual offset the guest hypervisor sets for the nested VM.

This appears to be the only timer patch in the series.  Should we not
also expose the EL2 timer to the VM and emulate that in software?

Thanks,
-Christoffer

  reply	other threads:[~2017-02-22 19:28 UTC|newest]

Thread overview: 111+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-09  6:23 [RFC 00/55] Nested Virtualization on KVM/ARM Jintack Lim
2017-01-09  6:23 ` [RFC 01/55] arm64: Add missing TCR hw defines Jintack Lim
2017-01-09  6:23 ` [RFC 02/55] KVM: arm64: Add nesting config option Jintack Lim
2017-01-09  6:23 ` [RFC 03/55] KVM: arm64: Add KVM nesting feature Jintack Lim
2017-01-09  6:24 ` [RFC 04/55] KVM: arm64: Allow userspace to set PSR_MODE_EL2x Jintack Lim
2017-01-09  6:24 ` [RFC 05/55] KVM: arm64: Add vcpu_mode_el2 primitive to support nesting Jintack Lim
2017-01-09  6:24 ` [RFC 06/55] KVM: arm64: Add EL2 execution context for nesting Jintack Lim
2017-02-22 11:10   ` Christoffer Dall
2017-06-26 14:33     ` Jintack Lim
2017-07-03  9:03       ` Christoffer Dall
2017-07-03  9:32         ` Marc Zyngier
2017-07-03  9:54           ` Christoffer Dall
2017-07-03 14:44             ` Jintack Lim
2017-07-03 15:30               ` Christoffer Dall
2017-01-09  6:24 ` [RFC 07/55] KVM: arm/arm64: Add virtual EL2 state emulation framework Jintack Lim
2017-02-22 11:12   ` Christoffer Dall
2017-06-01 20:05   ` Bandan Das
2017-06-02 11:51     ` Christoffer Dall
2017-06-02 17:36       ` Bandan Das
2017-06-02 19:06         ` Christoffer Dall
2017-06-02 19:25           ` Bandan Das
2017-01-09  6:24 ` [RFC 08/55] KVM: arm64: Set virtual EL2 context depending on the guest exception level Jintack Lim
2017-02-22 11:14   ` Christoffer Dall
2017-06-01 20:22   ` Bandan Das
2017-06-02  8:48     ` Marc Zyngier
2017-01-09  6:24 ` [RFC 09/55] KVM: arm64: Set shadow EL1 registers for virtual EL2 execution Jintack Lim
2017-02-22 11:19   ` Christoffer Dall
2017-01-09  6:24 ` [RFC 10/55] KVM: arm64: Synchronize EL1 system registers on virtual EL2 entry and exit Jintack Lim
2017-06-06 20:16   ` Bandan Das
2017-06-07  4:26     ` Jintack Lim
2017-01-09  6:24 ` [RFC 11/55] KVM: arm64: Emulate taking an exception to the guest hypervisor Jintack Lim
2017-02-22 11:28   ` Christoffer Dall
2017-06-06 20:21   ` Bandan Das
2017-06-06 20:38     ` Jintack Lim
2017-06-06 22:07       ` Bandan Das
2017-06-06 23:16         ` Jintack Lim
2017-06-07 17:21           ` Bandan Das
2017-01-09  6:24 ` [RFC 12/55] KVM: arm64: Handle EL2 register access traps Jintack Lim
2017-02-22 11:30   ` Christoffer Dall
2017-02-22 11:31   ` Christoffer Dall
2017-01-09  6:24 ` [RFC 13/55] KVM: arm64: Handle eret instruction traps Jintack Lim
2017-01-09  6:24 ` [RFC 14/55] KVM: arm64: Take account of system " Jintack Lim
2017-02-22 11:34   ` Christoffer Dall
2017-01-09  6:24 ` [RFC 15/55] KVM: arm64: Trap EL1 VM register accesses in virtual EL2 Jintack Lim
2017-01-09  6:24 ` [RFC 16/55] KVM: arm64: Forward VM reg traps to the guest hypervisor Jintack Lim
2017-02-22 11:39   ` Christoffer Dall
2017-01-09  6:24 ` [RFC 17/55] KVM: arm64: Trap SPSR_EL1, ELR_EL1 and VBAR_EL1 in virtual EL2 Jintack Lim
2017-02-22 11:40   ` Christoffer Dall
2017-01-09  6:24 ` [RFC 18/55] KVM: arm64: Forward traps due to HCR_EL2.NV1 bit to the guest hypervisor Jintack Lim
2017-02-22 11:41   ` Christoffer Dall
2017-01-09  6:24 ` [RFC 19/55] KVM: arm64: Trap CPACR_EL1 access in virtual EL2 Jintack Lim
2017-01-09  6:24 ` [RFC 20/55] KVM: arm64: Forward CPACR_EL1 traps to the guest hypervisor Jintack Lim
2017-01-09  6:24 ` [RFC 21/55] KVM: arm64: Forward HVC instruction " Jintack Lim
2017-02-22 11:47   ` Christoffer Dall
2017-06-26 15:21     ` Jintack Lim
2017-07-03  9:08       ` Christoffer Dall
2017-07-03  9:31         ` Andrew Jones
2017-07-03  9:51           ` Christoffer Dall
2017-07-03 12:03             ` Will Deacon
2017-07-03 12:35               ` Marc Zyngier
2017-07-03 13:29         ` Jintack Lim
2017-01-09  6:24 ` [RFC 22/55] KVM: arm64: Handle PSCI call from the guest Jintack Lim
2017-01-09  6:24 ` [RFC 23/55] KVM: arm64: Forward WFX to the guest hypervisor Jintack Lim
2017-01-09  6:24 ` [RFC 24/55] KVM: arm64: Forward FP exceptions " Jintack Lim
2017-01-09  6:24 ` [RFC 25/55] KVM: arm/arm64: Let vcpu thread modify its own active state Jintack Lim
2017-02-22 12:27   ` Christoffer Dall
2017-01-09  6:24 ` [RFC 26/55] KVM: arm/arm64: Add VGIC data structures for the nesting Jintack Lim
2017-01-09  6:24 ` [RFC 27/55] KVM: arm/arm64: Emulate GICH interface on GICv2 Jintack Lim
2017-02-22 13:06   ` Christoffer Dall
2017-01-09  6:24 ` [RFC 28/55] KVM: arm/arm64: Prepare vgic state for the nested VM Jintack Lim
2017-02-22 13:12   ` Christoffer Dall
2017-01-09  6:24 ` [RFC 29/55] KVM: arm/arm64: Set up the prepared vgic state Jintack Lim
2017-01-09  6:24 ` [RFC 30/55] KVM: arm/arm64: Inject irqs to the guest hypervisor Jintack Lim
2017-02-22 13:16   ` Christoffer Dall
2017-01-09  6:24 ` [RFC 31/55] KVM: arm/arm64: Inject maintenance interrupts " Jintack Lim
2017-02-22 13:19   ` Christoffer Dall
2017-01-09  6:24 ` [RFC 32/55] KVM: arm/arm64: register GICH iodev for " Jintack Lim
2017-02-22 13:21   ` Christoffer Dall
2017-01-09  6:24 ` [RFC 33/55] KVM: arm/arm64: Remove unused params in mmu functions Jintack Lim
2017-01-09  6:24 ` [RFC 34/55] KVM: arm/arm64: Abstract stage-2 MMU state into a separate structure Jintack Lim
2017-01-09  6:24 ` [RFC 35/55] KVM: arm/arm64: Support mmu for the virtual EL2 execution Jintack Lim
2017-02-22 13:38   ` Christoffer Dall
2017-01-09  6:24 ` [RFC 36/55] KVM: arm64: Invalidate virtual EL2 TLB entries when needed Jintack Lim
2017-01-09  6:24 ` [RFC 37/55] KVM: arm64: Setup vttbr_el2 on each VM entry Jintack Lim
2017-01-09  6:24 ` [RFC 38/55] KVM: arm/arm64: Make mmu functions non-static Jintack Lim
2017-01-09  6:24 ` [RFC 39/55] KVM: arm/arm64: Add mmu context for the nesting Jintack Lim
2017-02-22 13:34   ` Christoffer Dall
2017-01-09  6:24 ` [RFC 40/55] KVM: arm/arm64: Handle vttbr_el2 write operation from the guest hypervisor Jintack Lim
2017-02-22 17:59   ` Christoffer Dall
2017-01-09  6:24 ` [RFC 41/55] KVM: arm/arm64: Unmap/flush shadow stage 2 page tables Jintack Lim
2017-02-22 18:09   ` Christoffer Dall
2017-01-09  6:24 ` [RFC 42/55] KVM: arm64: Implement nested Stage-2 page table walk logic Jintack Lim
2017-01-09  6:24 ` [RFC 43/55] KVM: arm/arm64: Handle shadow stage 2 page faults Jintack Lim
2017-01-09  6:24 ` [RFC 44/55] KVM: arm/arm64: Move kvm_is_write_fault to header file Jintack Lim
2017-01-09  6:24 ` [RFC 45/55] KVM: arm64: KVM: Inject stage-2 page faults Jintack Lim
2017-01-09  6:24 ` [RFC 46/55] KVM: arm64: Add more info to the S2 translation result Jintack Lim
2017-01-09  6:24 ` [RFC 47/55] KVM: arm/arm64: Forward the guest hypervisor's stage 2 permission faults Jintack Lim
2017-02-22 18:15   ` Christoffer Dall
2017-01-09  6:24 ` [RFC 48/55] KVM: arm64: Emulate TLBI instruction Jintack Lim
2017-01-09  6:24 ` [RFC 49/55] KVM: arm64: Fixes to toggle_cache for nesting Jintack Lim
2017-01-09  6:24 ` [RFC 50/55] KVM: arm/arm64: Abstract kvm_phys_addr_ioremap() function Jintack Lim
2017-01-09  6:24 ` [RFC 51/55] KVM: arm64: Expose physical address of vcpu interface Jintack Lim
2017-01-09  6:24 ` [RFC 52/55] KVM: arm/arm64: Create a vcpu mapping for the nested VM Jintack Lim
2017-01-09  6:24 ` [RFC 53/55] KVM: arm64: Reflect shadow VMPIDR_EL2 value to MPIDR_EL1 Jintack Lim
2017-01-09  6:24 ` [RFC 54/55] KVM: arm/arm64: Adjust virtual offset considering nesting Jintack Lim
2017-02-22 19:28   ` Christoffer Dall [this message]
2017-01-09  6:24 ` [RFC 55/55] KVM: arm64: Enable nested virtualization Jintack Lim
2017-01-09 15:05 ` [RFC 00/55] Nested Virtualization on KVM/ARM David Hildenbrand
2017-01-10 16:18   ` Jintack Lim
2017-02-22 18:23 ` Christoffer Dall
2017-02-24 10:28   ` Jintack Lim

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