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Thu, 22 May 2025 08:10:26 -0700 (PDT) Date: Thu, 22 May 2025 08:10:25 -0700 In-Reply-To: <20250520010350.1740223-2-riel@surriel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250520010350.1740223-1-riel@surriel.com> <20250520010350.1740223-2-riel@surriel.com> Message-ID: Subject: Re: [RFC v2 1/9] x86/mm: Introduce MSR_IA32_CORE_CAPABILITIES From: Sean Christopherson To: Rik van Riel Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, kernel-team@meta.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, nadav.amit@gmail.com, Yu-cheng Yu Content-Type: text/plain; charset="us-ascii" On Mon, May 19, 2025, Rik van Riel wrote: > From: Yu-cheng Yu > > MSR_IA32_CORE_CAPABILITIES indicates the existence of other MSRs. > Bit[1] indicates Remote Action Request (RAR) TLB registers. > > Signed-off-by: Yu-cheng Yu > Signed-off-by: Rik van Riel > --- > arch/x86/include/asm/msr-index.h | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h > index b7dded3c8113..c848dd4bfceb 100644 > --- a/arch/x86/include/asm/msr-index.h > +++ b/arch/x86/include/asm/msr-index.h > @@ -220,6 +220,12 @@ > * their affected status. > */ > > +#define MSR_IA32_CORE_CAPABILITIES 0x000000cf > +#define CORE_CAP_RAR BIT(1) /* > + * Remote Action Request. Used to directly > + * flush the TLB on remote CPUs. > + */ CORE_CAPABILITIES is already supported and enumerated, it's just abbreviated: /* Abbreviated from Intel SDM name IA32_CORE_CAPABILITIES */ #define MSR_IA32_CORE_CAPS 0x000000cf #define MSR_IA32_CORE_CAPS_INTEGRITY_CAPS_BIT 2 #define MSR_IA32_CORE_CAPS_INTEGRITY_CAPS BIT(MSR_IA32_CORE_CAPS_INTEGRITY_CAPS_BIT) #define MSR_IA32_CORE_CAPS_SPLIT_LOCK_DETECT_BIT 5 #define MSR_IA32_CORE_CAPS_SPLIT_LOCK_DETECT BIT(MSR_IA32_CORE_CAPS_SPLIT_LOCK_DETECT_BIT)