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Re: [PATCH v1 1/3] i386: Remove the limitation of IP payloads for Intel
From: |
Eduardo Habkost |
Subject: |
Re: [PATCH v1 1/3] i386: Remove the limitation of IP payloads for Intel PT |
Date: |
Fri, 25 Sep 2020 16:29:56 -0400 |
On Fri, Sep 25, 2020 at 10:23:49PM +0200, Paolo Bonzini wrote:
> On 25/09/20 18:54, Eduardo Habkost wrote:
> > On Fri, Sep 25, 2020 at 04:42:26PM +0000, Strong, Beeman wrote:
> >> LIP=0 will differ from LIP=1 behavior only when CSbase is non-zero, which
> >> requires 32-bit code. In that case a LIP=0 implementation will provide
> >> only the EIP offset from CSbase in IP packets (like TIP or FUP), while
> >> LIP=1 implementation will provide the full LIP (CSbase + EIP offset).
> >>
> > Thanks. Is it possible to make KVM emulate LIP=0 behavior
> > correctly on LIP=1 hosts, or vice versa?
>
> No, it's not possible. KVM doesn't have a say on what the processor
> writes in the tracing packets.
Can KVM refuse to enable packet generation if CSbase is not zero
and CPUID.(EAX=14H,ECX=0)[bit 31] seen by guest is different from
host?
--
Eduardo
- Re: [PATCH v1 1/3] i386: Remove the limitation of IP payloads for Intel PT, Eduardo Habkost, 2020/09/25
- RE: [PATCH v1 1/3] i386: Remove the limitation of IP payloads for Intel PT, Strong, Beeman, 2020/09/25
- Re: [PATCH v1 1/3] i386: Remove the limitation of IP payloads for Intel PT, Eduardo Habkost, 2020/09/25
- Re: [PATCH v1 1/3] i386: Remove the limitation of IP payloads for Intel PT, Paolo Bonzini, 2020/09/25
- Re: [PATCH v1 1/3] i386: Remove the limitation of IP payloads for Intel PT,
Eduardo Habkost <=
- Re: [PATCH v1 1/3] i386: Remove the limitation of IP payloads for Intel PT, Paolo Bonzini, 2020/09/25
- RE: [PATCH v1 1/3] i386: Remove the limitation of IP payloads for Intel PT, Kang, Luwei, 2020/09/28
- Re: [PATCH v1 1/3] i386: Remove the limitation of IP payloads for Intel PT, Paolo Bonzini, 2020/09/28
- RE: [PATCH v1 1/3] i386: Remove the limitation of IP payloads for Intel PT, Kang, Luwei, 2020/09/28
- Re: [PATCH v1 1/3] i386: Remove the limitation of IP payloads for Intel PT, Eduardo Habkost, 2020/09/28
- RE: [PATCH v1 1/3] i386: Remove the limitation of IP payloads for Intel PT, Kang, Luwei, 2020/09/28
- Re: [PATCH v1 1/3] i386: Remove the limitation of IP payloads for Intel PT, Eduardo Habkost, 2020/09/28
- Re: [PATCH v1 1/3] i386: Remove the limitation of IP payloads for Intel PT, Paolo Bonzini, 2020/09/28
- RE: [PATCH v1 1/3] i386: Remove the limitation of IP payloads for Intel PT, Kang, Luwei, 2020/09/28