KVM: x86: move steal time initialization to vcpu entry time

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commit 7cae2bedcb upstream.

As reported at https://bugs.launchpad.net/qemu/+bug/1494350,
it is possible to have vcpu->arch.st.last_steal initialized
from a thread other than vcpu thread, say the iothread, via
KVM_SET_MSRS.

Which can cause an overflow later (when subtracting from vcpu threads
sched_info.run_delay).

To avoid that, move steal time accumulation to vcpu entry time,
before copying steal time data to guest.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Reviewed-by: David Matlack <dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: Liang Chen <liangchen.linux@gmail.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

...

This commit is contained in:

Marcelo Tosatti 2015-10-14 19:33:09 -03:00 • committed by Luis Henriques

parent 9541db7a98

commit 3d29c6dba4

1 changed files with 2 additions and 7 deletions

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arch/x86/kvm/x86.c

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