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Re: [PATCH] x86/asm: ELF metadata for simple cases
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 21 Feb 2023 12:05:40 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 21 Feb 2023 11:06:32 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 20.02.2023 12:04, Andrew Cooper wrote:
> This is generally good practice, and necessary for livepatch binary diffing to
> work.
>
> With this, livepatching of the SVM entry path works. The only complication is
> with svm_stgi_label which is only used by oprofile to guestimate (not
> completely correctly) when an NMI hit guest context.
>
> Livepatching of VMX is still an open question, because the logic doesn't form
> anything remotely resembling functions. Both code fragments jump into each
> other so need to be updated in tandem. Also, both code fragment entries need
> trampolines in the case that patching actually occurs. For now, just treat it
> as a single function.
I agree.
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
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