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Re: [RFC PATCH v2 21/34] x86/msr: Utilize the alternatives mechanism to write MSR
- To: Xin Li <xin@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-perf-users@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxx, linux-pm@xxxxxxxxxxxxxxx, linux-edac@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-acpi@xxxxxxxxxxxxxxx, linux-hwmon@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, platform-driver-x86@xxxxxxxxxxxxxxx
- From: Jürgen Groß <jgross@xxxxxxxx>
- Date: Thu, 24 Apr 2025 10:14:20 +0200
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- Delivery-date: Thu, 24 Apr 2025 08:14:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24.04.25 10:06, Xin Li wrote:
On 4/23/2025 9:05 AM, Jürgen Groß wrote:
It's not a major change, but when it is patched to use the immediate form MSR
write instruction, it's straightforwardly streamlined.
It should be rather easy to switch the current wrmsr/rdmsr paravirt patching
locations to use the rdmsr/wrmsr instructions instead of doing a call to
native_*msr().
The case of the new immediate form could be handled the same way.
Actually, that is how we get this patch with the existing alternatives
infrastructure. And we took a step further to also remove the pv_ops
MSR APIs...
And this is what I'm questioning. IMHO this approach is adding more
code by removing the pv_ops MSR_APIs just because "pv_ops is bad". And
I believe most refusal of pv_ops is based on no longer valid reasoning.
It looks to me that you want to add a new facility to the alternatives
infrastructure first?
Why would we need a new facility in the alternatives infrastructure?
Juergen
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