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Re: [PATCH 2/6] svm: Improve type of cpu_has_svm_feature
- To: George Dunlap <george.dunlap@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 19 Feb 2024 16:24:12 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 19 Feb 2024 15:24:17 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06.02.2024 02:20, George Dunlap wrote:
> --- a/xen/arch/x86/include/asm/hvm/svm/svm.h
> +++ b/xen/arch/x86/include/asm/hvm/svm/svm.h
> @@ -38,7 +38,10 @@ extern u32 svm_feature_flags;
> #define SVM_FEATURE_SSS 19 /* NPT Supervisor Shadow Stacks */
> #define SVM_FEATURE_SPEC_CTRL 20 /* MSR_SPEC_CTRL virtualisation */
>
> -#define cpu_has_svm_feature(f) (svm_feature_flags & (1u << (f)))
> +static inline bool cpu_has_svm_feature(unsigned int feat)
> +{
> + return svm_feature_flags & (1u << (feat));
> +}
> #define cpu_has_svm_npt cpu_has_svm_feature(SVM_FEATURE_NPT)
> #define cpu_has_svm_lbrv cpu_has_svm_feature(SVM_FEATURE_LBRV)
> #define cpu_has_svm_svml cpu_has_svm_feature(SVM_FEATURE_SVML)
Having seen patch 4 now, I have to raise the question here as well: Why
do we need a separate variable (svm_feature_flags) when we could use
the host policy (provided it isn't abused; see comments on patch 4)?
Jan
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