From: Mikhail Paulyshka <me@mixaill.net>
To: Borislav Petkov <bp@alien8.de>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] x86/rdrand: hide RDRAND and RDSEED from CPUID in case of a malfunction
Date: Wed, 12 Mar 2025 16:36:13 +0300 [thread overview]
Message-ID: <2916bccf-a252-4a57-bb4b-efb8703fd909@mixaill.net> (raw)
In-Reply-To: <20250312124530.GDZ9GB6vscPTpDv8Aq@fat_crate.local>
On 3/12/25 3:45 PM, Borislav Petkov wrote:
> On Wed, Mar 12, 2025 at 03:31:30PM +0300, Mikhail Paulyshka wrote:
>> @@ -46,6 +47,8 @@ void x86_init_rdrand(struct cpuinfo_x86 *c)
>>
>> if (failure) {
>> clear_cpu_cap(c, X86_FEATURE_RDRAND);
>> + if (c->x86_vendor == X86_VENDOR_AMD || c->x86_vendor == X86_VENDOR_HYGON)
> Hygon is family 0x18. Have you tested it there?
My bad, I thought Hygon is backwards compatible with AMD Zen1/2. Then it
can be removed in case Hygon's MSRs are different.
next prev parent reply other threads:[~2025-03-12 13:36 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-12 12:31 [PATCH 0/2] x86/rdrand: implement sanity check for RDSEED Mikhail Paulyshka
2025-03-12 12:31 ` [PATCH 1/2] " Mikhail Paulyshka
2025-03-12 16:32 ` Borislav Petkov
2025-03-21 6:51 ` kernel test robot
2025-03-12 12:31 ` [PATCH 2/2] x86/rdrand: hide RDRAND and RDSEED from CPUID in case of a malfunction Mikhail Paulyshka
2025-03-12 12:45 ` Borislav Petkov
2025-03-12 13:36 ` Mikhail Paulyshka [this message]
2025-03-12 12:40 ` [PATCH 0/2] x86/rdrand: implement sanity check for RDSEED Borislav Petkov
2025-03-12 13:17 ` Mikhail Paulyshka
2025-03-14 8:40 ` Mikhail Paulyshka
2025-03-13 17:32 ` Borislav Petkov
2025-03-14 8:16 ` Mikhail Paulyshka
2025-03-18 20:50 ` Mario Limonciello
2025-03-18 21:40 ` Mikhail Paulyshka
2025-04-14 11:52 ` Borislav Petkov
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