Hello,
Babu Moger <babu.moger@xxxxxxx> writes:
> This will be used to control the cache information.
> By default new information will be displayed. If user
> passes "-cpu legacy-cache" then older information will
> be displayed even if the hardware supports new information.
>
> Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
> ---
> include/hw/i386/pc.h | 6 +++++-
> target/i386/cpu.c | 1 +
> target/i386/cpu.h | 5 +++++
> 3 files changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
> index ffee841..9cda1ab 100644
> --- a/include/hw/i386/pc.h
> +++ b/include/hw/i386/pc.h
> @@ -327,7 +327,11 @@ bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);
> .driver = "q35-pcihost",\
> .property = "x-pci-hole64-fix",\
> .value = "off",\
> - },
> + },{\
> + .driver = TYPE_X86_CPU,\
> + .property = "legacy-cache",\
> + .value = "off",\
> + },\
Should be "on". Also note that this introduces extra '\' at the end.
>
> #define PC_COMPAT_2_9 \
> HW_COMPAT_2_9 \
> diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> index 67faa53..f4fbe3a 100644
> --- a/target/i386/cpu.c
> +++ b/target/i386/cpu.c
> @@ -5132,6 +5132,7 @@ static Property x86_cpu_properties[] = {
> false),
> DEFINE_PROP_BOOL("vmware-cpuid-freq", X86CPU, vmware_cpuid_freq, true),
> DEFINE_PROP_BOOL("tcg-cpuid", X86CPU, expose_tcg, true),
> + DEFINE_PROP_BOOL("legacy-cache", X86CPU, legacy_cache, false),
I'm wondering the reason why Intel L1 caches aren't shared per threads,
L2 not shared per threads/cores etc? I mean, changing that will also
require new compat flag with very similar name.
>
> /*
> * From "Requirements for Implementing the Microsoft
> diff --git a/target/i386/cpu.h b/target/i386/cpu.h
> index 806c34b..bbe13f2 100644
> --- a/target/i386/cpu.h
> +++ b/target/i386/cpu.h
> @@ -1394,6 +1394,11 @@ struct X86CPU {
> */
> bool enable_l3_cache;
>
> + /* Compatibility bits for old machine types.
> + * If true present the old cache topology information
> + */
> + bool legacy_cache;
> +
> /* Compatibility bits for old machine types: */
> bool enable_cpuid_0xb;
>
> --
> 1.8.3.1
