From: Dave Hansen <dave.hansen@intel.com>
To: "Kalra, Ashish" <ashish.kalra@amd.com>, Borislav Petkov <bp@alien8.de>
Cc: tglx@kernel.org, mingo@redhat.com, dave.hansen@linux.intel.com,
x86@kernel.org, hpa@zytor.com, seanjc@google.com,
peterz@infradead.org, thomas.lendacky@amd.com,
herbert@gondor.apana.org.au, davem@davemloft.net,
ardb@kernel.org, pbonzini@redhat.com, aik@amd.com,
Michael.Roth@amd.com, KPrateek.Nayak@amd.com,
Tycho.Andersen@amd.com, Nathan.Fontenot@amd.com,
ackerleytng@google.com, jackyli@google.com, pgonda@google.com,
rientjes@google.com, jacobhxu@google.com, xin@zytor.com,
pawan.kumar.gupta@linux.intel.com, babu.moger@amd.com,
dyoung@redhat.com, nikunj@amd.com, john.allen@amd.com,
darwi@linutronix.de, linux-kernel@vger.kernel.org,
linux-crypto@vger.kernel.org, kvm@vger.kernel.org,
linux-coco@lists.linux.dev
Subject: Re: [PATCH v5 2/7] x86/msr: add wrmsrq_on_cpus helper
Date: Thu, 28 May 2026 12:50:16 -0700 [thread overview]
Message-ID: <c40dcb8c-5706-4c0f-ac85-c22957b9e192@intel.com> (raw)
In-Reply-To: <2d164e19-5cc6-47ca-9150-f4d432dd10c4@amd.com>
On 5/28/26 12:37, Kalra, Ashish wrote:
> A simple loop would be perfectly fine and avoids the need for the wrmsrq_on_cpus() helper entirely:
>
> for_each_cpu(cpu, &rmpopt_cpumask)
> wrmsrq_on_cpu(cpu, MSR_AMD64_RMPOPT_BASE, rmpopt_base);
I'm glad we're on the same page finally. I just hope we can get to this
point more quickly next time. I started off with exactly this
suggestion, but someone chimed in to the thread and said it was "slower":
> https://lore.kernel.org/lkml/6a50d050-f602-43fd-a44a-cecedd9823eb@amd.com/
next prev parent reply other threads:[~2026-05-28 19:50 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-18 21:41 [PATCH v5 0/7] Add RMPOPT support Ashish Kalra
2026-05-18 21:41 ` [PATCH v5 1/7] x86/cpufeatures: Add X86_FEATURE_AMD_RMPOPT feature flag Ashish Kalra
2026-05-27 20:17 ` Borislav Petkov
2026-05-18 21:42 ` [PATCH v5 2/7] x86/msr: add wrmsrq_on_cpus helper Ashish Kalra
2026-05-18 22:04 ` Dave Hansen
2026-05-18 22:09 ` Kalra, Ashish
2026-05-18 22:38 ` Dave Hansen
2026-05-27 21:06 ` Borislav Petkov
2026-05-27 21:38 ` Dave Hansen
2026-05-28 0:43 ` Borislav Petkov
2026-05-28 19:37 ` Kalra, Ashish
2026-05-28 19:50 ` Dave Hansen [this message]
2026-05-28 19:55 ` Kalra, Ashish
2026-05-29 0:26 ` Borislav Petkov
2026-05-29 0:29 ` Kalra, Ashish
2026-05-18 21:42 ` [PATCH v5 3/7] x86/sev: Initialize RMPOPT configuration MSRs Ashish Kalra
2026-05-18 21:42 ` [PATCH v5 4/7] x86/sev: Add support to perform RMP optimizations asynchronously Ashish Kalra
2026-05-28 14:45 ` Ackerley Tng
2026-05-28 23:52 ` Kalra, Ashish
2026-06-01 18:03 ` Kalra, Ashish
2026-05-18 21:43 ` [PATCH v5 5/7] x86/sev: Add interface to re-enable RMP optimizations Ashish Kalra
2026-05-18 21:43 ` [PATCH v5 6/7] KVM: SEV: Perform RMP optimizations on SNP guest shutdown Ashish Kalra
2026-05-18 21:43 ` [PATCH v5 7/7] x86/sev: Add debugfs support for RMPOPT Ashish Kalra
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