Re: [PATCH 2/3] KVM: nSVM: Propagate SVM_EXIT_CR0_SEL_WRITE correctly for LMSW emulation

[Sean Christopherson]

On Fri, Oct 24, 2025, Yosry Ahmed wrote:
> When emulating L2 instructions, svm_check_intercept() checks whether a
> write to CR0 should trigger a synthesized #VMEXIT with
> SVM_EXIT_CR0_SEL_WRITE. For MOV-to-CR0, SVM_EXIT_CR0_SEL_WRITE is only
> triggered if any bit other than CR0.MP and CR0.TS is updated. However,
> according to the APM (24593—Rev.  3.42—March 2024, Table 15-7):
> 
>   The LMSW instruction treats the selective CR0-write
>   intercept as a non-selective intercept (i.e., it intercepts
>   regardless of the value being written).
> 
> Skip checking the changed bits for x86_intercept_lmsw and always inject
> SVM_EXIT_CR0_SEL_WRITE.
> 
> Fixes: cfec82cb7d31 ("KVM: SVM: Add intercept check for emulated cr accesses")
> Cc: stable@vger.kernel

Bad email (mostly in case you're using a macro for this; the next patch has the
same typo).