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| author |   Eduardo Habkost <ehabkost@redhat.com> | 2021-09-03 17:15:59 -0400 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2021-09-06 06:11:55 -0400 |
| commit | 074c82c8f7cf8a46c3b81965f122599e3a133450 (patch) | |
| tree | 0f91b250d83ea3510b0003014dd73408df9f2f5d /arch/x86 | |
| parent | kvm: x86: Set KVM_MAX_VCPU_ID to 4*KVM_MAX_VCPUS (diff) | |
| download | linux-dev-074c82c8f7cf8a46c3b81965f122599e3a133450.tar.xz linux-dev-074c82c8f7cf8a46c3b81965f122599e3a133450.zip | |
kvm: x86: Increase MAX_VCPUS to 1024
Increase KVM_MAX_VCPUS to 1024, so we can test larger VMs.
I'm not changing KVM_SOFT_MAX_VCPUS yet because I'm afraid it
might involve complicated questions around the meaning of
"supported" and "recommended" in the upstream tree.
KVM_SOFT_MAX_VCPUS will be changed in a separate patch.
For reference, visible effects of this change are:
- KVM_CAP_MAX_VCPUS will now return 1024 (of course)
- Default value for CPUID[HYPERV_CPUID_IMPLEMENT_LIMITS (00x40000005)].EAX
will now be 1024
- KVM_MAX_VCPU_ID will change from 1151 to 4096
- Size of struct kvm will increase from 19328 to 22272 bytes
(in x86_64)
- Size of struct kvm_ioapic will increase from 1780 to 5084 bytes
(in x86_64)
- Bitmap stack variables that will grow:
- At kvm_hv_flush_tlb() kvm_hv_send_ipi(),
vp_bitmap[] and vcpu_bitmap[] will now be 128 bytes long
- vcpu_bitmap at bioapic_write_indirect() will be 128 bytes long
once patch "KVM: x86: Fix stack-out-of-bounds memory access
from ioapic_write_indirect()" is applied
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20210903211600.2002377-3-ehabkost@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 59da1fbf5248..52ca8da4ab52 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -37,7 +37,7 @@ #define __KVM_HAVE_ARCH_VCPU_DEBUGFS -#define KVM_MAX_VCPUS 288 +#define KVM_MAX_VCPUS 1024 #define KVM_SOFT_MAX_VCPUS 240 /* |