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Re: [Qemu-devel] [PATCH v7 7/9] i386: Add support for CPUID_8000_001E fo
From: |
Eduardo Habkost |
Subject: |
Re: [Qemu-devel] [PATCH v7 7/9] i386: Add support for CPUID_8000_001E for AMD |
Date: |
Mon, 7 May 2018 16:39:44 -0300 |
User-agent: |
Mutt/1.9.2 (2017-12-15) |
On Thu, Apr 26, 2018 at 11:26:47AM -0500, Babu Moger wrote:
> Populate threads/core_id/apic_ids/socket_id when CPUID_EXT3_TOPOEXT
> feature is supported. This is required to support hyperthreading feature
> on AMD CPUs. This is supported via CPUID_8000_001E extended functions.
>
> Signed-off-by: Babu Moger <address@hidden>
> Tested-by: Geoffrey McRae <address@hidden>
> ---
> target/i386/cpu.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> index 1024b09..1b15023 100644
> --- a/target/i386/cpu.c
> +++ b/target/i386/cpu.c
> @@ -315,6 +315,12 @@ static uint32_t encode_cache_cpuid80000005(CPUCacheInfo
> *cache)
> (((CORES_IN_CMPLX - 1) * 2) + 1) : \
> (CORES_IN_CMPLX - 1))
>
> +/* Definitions used on CPUID Leaf 0x8000001E */
> +#define EXTENDED_APIC_ID(threads, socket_id, core_id, thread_id) \
> + ((threads) ? \
> + ((socket_id << 6) | (core_id << 1) | thread_id) : \
> + ((socket_id << 6) | core_id))
I suggest moving this to i386/topology.h.
> +
> /*
> * Encode cache info for CPUID[0x80000006].ECX and CPUID[0x80000006].EDX
> * @l3 can be NULL.
> @@ -4105,6 +4111,14 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index,
> uint32_t count,
> break;
> }
> break;
> + case 0x8000001E:
> + assert(cpu->core_id <= 255);
Where's the code that ensures this assert() line can't be
triggered by any command-line configuration?
> + *eax = EXTENDED_APIC_ID((cs->nr_threads - 1),
> + cpu->socket_id, cpu->core_id, cpu->thread_id);
> + *ebx = (cs->nr_threads - 1) << 8 | cpu->core_id;
> + *ecx = cpu->socket_id;
> + *edx = 0;
> + break;
> case 0xC0000000:
> *eax = env->cpuid_xlevel2;
> *ebx = 0;
> --
> 2.7.4
>
>
--
Eduardo
- Re: [Qemu-devel] [PATCH v7 7/9] i386: Add support for CPUID_8000_001E for AMD,
Eduardo Habkost <=
- Re: [Qemu-devel] [PATCH v7 7/9] i386: Add support for CPUID_8000_001E for AMD, Moger, Babu, 2018/05/07
- Re: [Qemu-devel] [PATCH v7 7/9] i386: Add support for CPUID_8000_001E for AMD, Eduardo Habkost, 2018/05/08
- Re: [Qemu-devel] [PATCH v7 7/9] i386: Add support for CPUID_8000_001E for AMD, Moger, Babu, 2018/05/08
- Re: [Qemu-devel] [PATCH v7 7/9] i386: Add support for CPUID_8000_001E for AMD, Eduardo Habkost, 2018/05/11
- Re: [Qemu-devel] [PATCH v7 7/9] i386: Add support for CPUID_8000_001E for AMD, Moger, Babu, 2018/05/11
- Re: [Qemu-devel] [PATCH v7 7/9] i386: Add support for CPUID_8000_001E for AMD, Eduardo Habkost, 2018/05/11