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| author | Wanpeng Li | 2019-07-22 06:26:21 +0200 |
|---|---|---|
| committer | Paolo Bonzini | 2019-07-22 13:55:48 +0200 |
| commit | d9a710e5fc4941944d565b013414e9fdc66242b5 (patch) | |
| tree | 9f832b1d46c0addf58003df168a347e43707ed11 /arch/x86/include | |
| parent | KVM: X86: Fix fpu state crash in kvm guest (diff) | |
| download | kernel-qcow2-linux-d9a710e5fc4941944d565b013414e9fdc66242b5.tar.gz kernel-qcow2-linux-d9a710e5fc4941944d565b013414e9fdc66242b5.tar.xz kernel-qcow2-linux-d9a710e5fc4941944d565b013414e9fdc66242b5.zip | |
KVM: X86: Dynamically allocate user_fpu
After reverting commit 240c35a3783a (kvm: x86: Use task structs fpu field
for user), struct kvm_vcpu is 19456 bytes on my server, PAGE_ALLOC_COSTLY_ORDER(3)
is the order at which allocations are deemed costly to service. In serveless
scenario, one host can service hundreds/thoudands firecracker/kata-container
instances, howerver, new instance will fail to launch after memory is too
fragmented to allocate kvm_vcpu struct on host, this was observed in some
cloud provider product environments.
This patch dynamically allocates user_fpu, kvm_vcpu is 15168 bytes now on my
Skylake server.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/include')
| -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 b2f1ffb937af..e74f0711eaaf 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -616,7 +616,7 @@ struct kvm_vcpu_arch { * "guest_fpu" state here contains the guest FPU context, with the * host PRKU bits. */ - struct fpu user_fpu; + struct fpu *user_fpu; struct fpu *guest_fpu; u64 xcr0; |