On 11/3/2020 2:08 PM, Tao Xu wrote:
On 11/3/20 12:43 AM, Andy Lutomirski wrote:
On Sun, Nov 1, 2020 at 10:14 PM Tao Xu wrote:
...
+static int handle_notify(struct kvm_vcpu *vcpu)
+{
+ unsigned long exit_qualification =
vmcs_readl(EXIT_QUALIFICATION);
+
+ /*
+ * Noti
On 11/3/2020 2:25 AM, Paolo Bonzini wrote:
On 02/11/20 19:01, Andy Lutomirski wrote:
What's the point? Surely the kernel should reliably mitigate the
flaw, and the kernel should decide how to do so.
There is some slowdown in trapping #DB and #AC unconditionally. Though
for these two cases no
On 11/3/2020 2:12 PM, Tao Xu wrote:
On 11/3/20 6:53 AM, Jim Mattson wrote:
On Sun, Nov 1, 2020 at 10:14 PM Tao Xu wrote:
There are some cases that malicious virtual machines can cause CPU stuck
(event windows don't open up), e.g., infinite loop in microcode when
nested #AC (CVE-2015-5307).
On 11/3/20 6:53 AM, Jim Mattson wrote:
On Sun, Nov 1, 2020 at 10:14 PM Tao Xu wrote:
There are some cases that malicious virtual machines can cause CPU stuck
(event windows don't open up), e.g., infinite loop in microcode when
nested #AC (CVE-2015-5307). No event window obviously means no e
On 11/3/20 12:43 AM, Andy Lutomirski wrote:
On Sun, Nov 1, 2020 at 10:14 PM Tao Xu wrote:
There are some cases that malicious virtual machines can cause CPU stuck
(event windows don't open up), e.g., infinite loop in microcode when
nested #AC (CVE-2015-5307). No event window obviously means
On 11/3/20 1:32 AM, Sean Christopherson wrote:
On Mon, Nov 02, 2020 at 02:14:45PM +0800, Tao Xu wrote:
There are some cases that malicious virtual machines can cause CPU stuck
(event windows don't open up), e.g., infinite loop in microcode when
nested #AC (CVE-2015-5307). No event window obvio
On 11/3/20 1:31 AM, Sean Christopherson wrote:
On Mon, Nov 02, 2020 at 08:43:30AM -0800, Andy Lutomirski wrote:
On Sun, Nov 1, 2020 at 10:14 PM Tao Xu wrote:
2. Another patch to disable interception of #DB and #AC when notify
VM-Exiting is enabled.
Whoa there.
A VM control that says "hey
On Sun, Nov 1, 2020 at 10:14 PM Tao Xu wrote:
>
> There are some cases that malicious virtual machines can cause CPU stuck
> (event windows don't open up), e.g., infinite loop in microcode when
> nested #AC (CVE-2015-5307). No event window obviously means no events,
> e.g. NMIs, SMIs, and IRQs wil
On Mon, Nov 02, 2020 at 10:01:16AM -0800, Andy Lutomirski wrote:
> On Mon, Nov 2, 2020 at 9:31 AM Sean Christopherson
> wrote:
> >
> > On Mon, Nov 02, 2020 at 08:43:30AM -0800, Andy Lutomirski wrote:
> > > On Sun, Nov 1, 2020 at 10:14 PM Tao Xu wrote:
> > > > 2. Another patch to disable intercept
On 02/11/20 19:01, Andy Lutomirski wrote:
> What's the point? Surely the kernel should reliably mitigate the
> flaw, and the kernel should decide how to do so.
There is some slowdown in trapping #DB and #AC unconditionally. Though
for these two cases nobody should care so I agree with keeping th
On Mon, Nov 2, 2020 at 9:31 AM Sean Christopherson
wrote:
>
> On Mon, Nov 02, 2020 at 08:43:30AM -0800, Andy Lutomirski wrote:
> > On Sun, Nov 1, 2020 at 10:14 PM Tao Xu wrote:
> > > 2. Another patch to disable interception of #DB and #AC when notify
> > > VM-Exiting is enabled.
> >
> > Whoa ther
On Mon, Nov 02, 2020 at 02:14:45PM +0800, Tao Xu wrote:
> There are some cases that malicious virtual machines can cause CPU stuck
> (event windows don't open up), e.g., infinite loop in microcode when
> nested #AC (CVE-2015-5307). No event window obviously means no events,
> e.g. NMIs, SMIs, and I
On Mon, Nov 02, 2020 at 08:43:30AM -0800, Andy Lutomirski wrote:
> On Sun, Nov 1, 2020 at 10:14 PM Tao Xu wrote:
> > 2. Another patch to disable interception of #DB and #AC when notify
> > VM-Exiting is enabled.
>
> Whoa there.
>
> A VM control that says "hey, CPU, if you messed up and livelocke
On Sun, Nov 1, 2020 at 10:14 PM Tao Xu wrote:
>
> There are some cases that malicious virtual machines can cause CPU stuck
> (event windows don't open up), e.g., infinite loop in microcode when
> nested #AC (CVE-2015-5307). No event window obviously means no events,
> e.g. NMIs, SMIs, and IRQs wil
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