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| author | Paolo Bonzini <pbonzini@redhat.com> | 2016-09-15 23:52:43 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-24 10:07:35 +0200 |
| commit | 92c67861dab5e7ac2593609cb27d92751891e808 (patch) | |
| tree | 2defafee9fa80c1e4b38183370ccc99f3d30ba03 /arch/x86 | |
| parent | 717cb2d8cb5706415c43cbc04e39ed4a23692a3c (diff) | |
| download | lwn-92c67861dab5e7ac2593609cb27d92751891e808.tar.gz lwn-92c67861dab5e7ac2593609cb27d92751891e808.zip | |
Revert "KVM: x86: fix missed hardware breakpoints"
[the change is part of 70e4da7a8ff62f2775337b705f45c804bb450454, which
is already in stable kernels 4.1.y to 4.4.y. this part of the fix
however was later undone, so remove the line again]
The following patches were applied in the wrong order in -stable. This
is the order as they appear in Linus' tree,
[0] commit 4e422bdd2f84 ("KVM: x86: fix missed hardware breakpoints")
[1] commit 172b2386ed16 ("KVM: x86: fix missed hardware breakpoints")
[2] commit 70e4da7a8ff6 ("KVM: x86: fix root cause for missed hardware breakpoints")
but this is the order for linux-4.4.y
[1] commit fc90441e728a ("KVM: x86: fix missed hardware breakpoints")
[2] commit 25e8618619a5 ("KVM: x86: fix root cause for missed hardware breakpoints")
[0] commit 0f6e5e26e68f ("KVM: x86: fix missed hardware breakpoints")
The upshot is that KVM_DEBUGREG_RELOAD is always set when returning
from kvm_arch_vcpu_load() in stable, but not in Linus' tree.
This happened because [0] and [1] are the same patch. [0] and [1] come from two
different merges, and the later merge is trivially resolved; when [2]
is applied it reverts both of them. Instead, when using the [1][2][0]
order, patches applies normally but "KVM: x86: fix missed hardware
breakpoints" is present in the final tree.
Reported-by: Matt Fleming <matt@codeblueprint.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/x86.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index be222666b1c2..d7cb9577fa31 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2735,7 +2735,6 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) } kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); - vcpu->arch.switch_db_regs |= KVM_DEBUGREG_RELOAD; } void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) |