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Re: [RFC PATCH v1 01/15] x86/msr: Replace __wrmsr() with native_wrmsrl()
- To: "Xin Li (Intel)" <xin@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-perf-users@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxx, linux-edac@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-ide@xxxxxxxxxxxxxxx, linux-pm@xxxxxxxxxxxxxxx, bpf@xxxxxxxxxxxxxxx, llvm@xxxxxxxxxxxxxxx
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 31 Mar 2025 22:45:43 +0100
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- Delivery-date: Mon, 31 Mar 2025 21:45:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 31/03/2025 9:22 am, Xin Li (Intel) wrote:
> __wrmsr() is the lowest level primitive MSR write API, and its direct
> use is NOT preferred. Use its wrapper function native_wrmsrl() instead.
>
> No functional change intended.
>
> Signed-off-by: Xin Li (Intel) <xin@xxxxxxxxx>
The critical piece of information you're missing from the commit message
is that the MSR_IMM instructions take a single u64.
Therefore to use them, you've got to arrange for all callers to provide
a single u64, rather than a split u32 pair.
~Andrew
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