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SubjectRe: [PATCH 0/6] x86/kvm: add boot parameters for max vcpu configs
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On 01/07/21 17:40, Juergen Gross wrote:
> In order to be able to have a single kernel for supporting even huge
> numbers of vcpus per guest some arrays should be sized dynamically.
>
> The easiest way to do that is to add boot parameters for the maximum
> number of vcpus and the highest supported vcpu-id overwriting the
> normal default.
>
> This patch series is doing that for x86. The same scheme can be easily
> adapted to other architectures, but I don't want to do that in the
> first iteration.
>
> In the long term I'd suggest to have a per-guest setting of the two
> parameters allowing to spare some memory for smaller guests. OTOH this
> would require new ioctl()s and respective qemu modifications, so I let
> those away for now.
>
> I've tested the series not to break normal guest operation and the new
> parameters to be effective on x86. For Arm64 I did a compile test only.
>
> Juergen Gross (6):
> x86/kvm: fix vcpu-id indexed array sizes
> x86/kvm: remove non-x86 stuff from arch/x86/kvm/ioapic.h
> x86/kvm: add boot parameter for maximum vcpu-id
> x86/kvm: introduce per cpu vcpu masks
> kvm: allocate vcpu pointer array separately
> x86/kvm: add boot parameter for setting max number of vcpus per guest
>
> .../admin-guide/kernel-parameters.txt | 18 +++++++
> arch/arm64/kvm/arm.c | 28 +++++++++--
> arch/x86/include/asm/kvm_host.h | 22 ++++++---
> arch/x86/kvm/hyperv.c | 25 +++++++---
> arch/x86/kvm/ioapic.c | 14 +++++-
> arch/x86/kvm/ioapic.h | 8 +--
> arch/x86/kvm/irq_comm.c | 9 +++-
> arch/x86/kvm/x86.c | 49 ++++++++++++++++++-
> include/linux/kvm_host.h | 17 ++++++-
> 9 files changed, 160 insertions(+), 30 deletions(-)
>

Queued patches 1-2, thanks (1 for stable too).

Paolo

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