Xiaoyao Li <xiaoyao.li@xxxxxxxxx> writes:
> Use KVM_TDX_GET_CPUID to get the CPUIDs that are managed and enfored
> by TDX module for TD guest. Check QEMU's configuration against the
> fetched data.
>
> Print wanring message when 1. a feature is not supported but requested
> by QEMU or 2. QEMU doesn't want to expose a feature while it is enforced
> enabled.
>
> - If cpu->enforced_cpuid is not set, prints the warning message of both
> 1) and 2) and tweak QEMU's configuration.
>
> - If cpu->enforced_cpuid is set, quit if any case of 1) or 2).
>
> Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
> ---
> target/i386/cpu.c | 33 ++++++++++++++-
> target/i386/cpu.h | 7 +++
> target/i386/kvm/tdx.c | 99 +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 137 insertions(+), 2 deletions(-)
>
> diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> index f1330627adbb..a948fd0bd674 100644
> --- a/target/i386/cpu.c
> +++ b/target/i386/cpu.c
> @@ -5482,8 +5482,8 @@ static bool x86_cpu_have_filtered_features(X86CPU *cpu)
> return false;
> }
>
> -static void mark_unavailable_features(X86CPU *cpu, FeatureWord w, uint64_t mask,
> - const char *verbose_prefix)
> +void mark_unavailable_features(X86CPU *cpu, FeatureWord w, uint64_t mask,
> + const char *verbose_prefix)
> {
> CPUX86State *env = &cpu->env;
> FeatureWordInfo *f = &feature_word_info[w];
> @@ -5510,6 +5510,35 @@ static void mark_unavailable_features(X86CPU *cpu, FeatureWord w, uint64_t mask,
> }
> }
>
> +void mark_forced_on_features(X86CPU *cpu, FeatureWord w, uint64_t mask,
> + const char *verbose_prefix)
> +{
> + CPUX86State *env = &cpu->env;
> + FeatureWordInfo *f = &feature_word_info[w];
> + int i;
> +
> + if (!cpu->force_features) {
> + env->features[w] |= mask;
> + }
> +
> + cpu->forced_on_features[w] |= mask;
> +
> + if (!verbose_prefix) {
> + return;
> + }
> +
> + for (i = 0; i < 64; ++i) {
> + if ((1ULL << i) & mask) {
> + g_autofree char *feat_word_str = feature_word_description(f);
Does not compile for me:
../target/i386/cpu.c: In function ‘mark_forced_on_features’:
../target/i386/cpu.c:5531:46: error: too few arguments to function ‘feature_word_description’
5531 | g_autofree char *feat_word_str = feature_word_description(f);
| ^~~~~~~~~~~~~~~~~~~~~~~~
../target/i386/cpu.c:5451:14: note: declared here
5451 | static char *feature_word_description(FeatureWordInfo *f, uint32_t bit)
| ^~~~~~~~~~~~~~~~~~~~~~~~
> + warn_report("%s: %s%s%s [bit %d]",
> + verbose_prefix,
> + feat_word_str,
> + f->feat_names[i] ? "." : "",
> + f->feat_names[i] ? f->feat_names[i] : "", i);
> + }
> + }
> +}
> +
> static void x86_cpuid_version_get_family(Object *obj, Visitor *v,
> const char *name, void *opaque,
> Error **errp)
[...]
