KVM: X86: support paravirtualized help for TLB shootdowns
authorWanpeng Li <wanpeng.li@hotmail.com>
Wed, 13 Dec 2017 01:33:04 +0000 (17:33 -0800)
committerRadim Krčmář <rkrcmar@redhat.com>
Tue, 16 Jan 2018 15:34:13 +0000 (16:34 +0100)
commitf38a7b75267f1fb240a8178cbcb16d66dd37aac8
tree6dd7bcbd99a7021e78b065e60b7b46f26d1571ad
parentc2ba05ccfde2f069a66c0462e5b5ef8a517dcc9c
KVM: X86: support paravirtualized help for TLB shootdowns

When running on a virtual machine, IPIs are expensive when the target
CPU is sleeping.  Thus, it is nice to be able to avoid them for TLB
shootdowns.  KVM can just do the flush via INVVPID on the guest's behalf
the next time the CPU is scheduled.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
[Use "&" to test the bit instead of "==". - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
arch/x86/kvm/cpuid.c
arch/x86/kvm/x86.c