On 11/16/21 15:13, Juergen Gross wrote:
On 05.11.21 20:20, Marc Zyngier wrote:
The kvm structure is pretty large. A large portion of it is the vcpu
array, which is 4kB on x86_64 and arm64 as they deal with 512 vcpu
VMs. Of course, hardly anyone runs VMs this big, so this is often a
net waste of memory and cache locality.
A possible approach is to turn the fixed-size array into an xarray,
which results in a net code deletion after a bit of cleanup.
This series is on top of the current linux/master as it touches the
RISC-V implementation. Only tested on arm64.
Marc Zyngier (5):
KVM: Move wiping of the kvm->vcpus array to common code
KVM: mips: Use kvm_get_vcpu() instead of open-coded access
KVM: s390: Use kvm_get_vcpu() instead of open-coded access
KVM: x86: Use kvm_get_vcpu() instead of open-coded access
KVM: Convert the kvm->vcpus array to a xarray
arch/arm64/kvm/arm.c | 10 +---------
arch/mips/kvm/loongson_ipi.c | 4 ++--
arch/mips/kvm/mips.c | 23 ++---------------------
arch/powerpc/kvm/powerpc.c | 10 +---------
arch/riscv/kvm/vm.c | 10 +---------
arch/s390/kvm/kvm-s390.c | 26 ++++++--------------------
arch/x86/kvm/vmx/posted_intr.c | 2 +-
arch/x86/kvm/x86.c | 9 +--------
include/linux/kvm_host.h | 7 ++++---
virt/kvm/kvm_main.c | 33 ++++++++++++++++++++++++++-------
10 files changed, 45 insertions(+), 89 deletions(-)
For x86 you can add my:
Tested-by: Juergen Gross <jgross@xxxxxxxx>
Heh, unfortunately x86 is the only one that needs a change in patch 4.
I'll Cc you on my version.
Paolo
