On Mon, Oct 15, 2018 at 12:47:24PM +0800, Robert Hoo wrote:
> Add FeatureWordType indicator in struct FeatureWordInfo.
> Change feature_word_info[] accordingly.
> Change existing functions that refer to feature_word_info[] accordingly.
>
> Signed-off-by: Robert Hoo <robert...@linux.intel.com>
> ---
> target/i386/cpu.c | 188
> +++++++++++++++++++++++++++++++++++++++---------------
> 1 file changed, 136 insertions(+), 52 deletions(-)
>
> diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> index c88876d..d191b9c 100644
> --- a/target/i386/cpu.c
> +++ b/target/i386/cpu.c
> @@ -770,17 +770,36 @@ static void x86_cpu_vendor_words2str(char *dst,
> uint32_t vendor1,
> /* missing:
> CPUID_XSAVE_XSAVEC, CPUID_XSAVE_XSAVES */
>
> +typedef enum FeatureWordType {
> + CPUID_FEATURE_WORD,
> + MSR_FEATURE_WORD,
> +} FeatureWordType;
> +
> typedef struct FeatureWordInfo {
> + FeatureWordType type;
> /* feature flags names are taken from "Intel Processor Identification and
> * the CPUID Instruction" and AMD's "CPUID Specification".
> * In cases of disagreement between feature naming conventions,
> * aliases may be added.
> */
> const char *feat_names[32];
> - uint32_t cpuid_eax; /* Input EAX for CPUID */
> - bool cpuid_needs_ecx; /* CPUID instruction uses ECX as input */
> - uint32_t cpuid_ecx; /* Input ECX value for CPUID */
> - int cpuid_reg; /* output register (R_* constant) */
> + union {
> + /* If type==CPUID_FEATURE_WORD */
> + struct {
> + uint32_t eax; /* Input EAX for CPUID */
> + bool needs_ecx; /* CPUID instruction uses ECX as input */
> + uint32_t ecx; /* Input ECX value for CPUID */
> + int reg; /* output register (R_* constant) */
> + } cpuid;
> + /* If type==MSR_FEATURE_WORD */
> + struct {
> + uint32_t index;
> + struct { /*CPUID that enumerate this MSR*/
> + FeatureWord cpuid_class;
> + uint32_t cpuid_flag;
> + } cpuid_dep;
Aren't you going to use this field anywhere? Probably we want to
prevent the VM from starting if a bit is set in the feature world
but the cpuid_dep bit is not set.
e.g.:
qemu-system-x86_64 -cpu Skylake-Client,-arch-capabilities,+rsba
probably should fail to start.
> + } msr;
> + };
[...]
--
Eduardo
