From: Dave Hansen <dave.hansen@intel.com>
To: Sean Christopherson <seanjc@google.com>,
Ashish Kalra <Ashish.Kalra@amd.com>
Cc: tglx@kernel.org, mingo@redhat.com, bp@alien8.de,
dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.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,
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 v2 3/7] x86/sev: add support for RMPOPT instruction
Date: Wed, 4 Mar 2026 07:32:58 -0800 [thread overview]
Message-ID: <692e1b72-920d-4b7d-a5b2-75fd554a13c0@intel.com> (raw)
In-Reply-To: <7ab8d3af-b4f5-481c-ab2e-059ddd7e718e@intel.com>
On 3/4/26 07:25, Dave Hansen wrote:
> BTW, I assume that the RMPOPT disable machinery is driven from the
> INVLPGB-like TLB invalidations that are a part of the SNP
> shared=>private conversions. It's a darn shame that RMPOPT wasn't
> broadcast in the same way. It would save the poor OS a lot of work. The
> RMPOPT table is per-cpu of course, but I'm not sure what keeps *a* CPU
> from broadcasting its success finding an SNP-free physical region to
> other CPUs.
I guess the other dirt simple optimization would be to have one CPU to
the RMPOPT scan and then only IPI more CPUs if that first one succeeds.
That wouldn't be awful.
next prev parent reply other threads:[~2026-03-04 15:32 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-02 21:35 [PATCH v2 0/7] Add RMPOPT support Ashish Kalra
2026-03-02 21:35 ` [PATCH v2 1/7] x86/cpufeatures: Add X86_FEATURE_AMD_RMPOPT feature flag Ashish Kalra
2026-03-02 23:00 ` Dave Hansen
2026-03-05 12:36 ` Borislav Petkov
2026-03-02 21:35 ` [PATCH v2 2/7] x86/sev: add support for enabling RMPOPT Ashish Kalra
2026-03-02 22:32 ` Dave Hansen
2026-03-02 22:55 ` Kalra, Ashish
2026-03-02 23:00 ` Dave Hansen
2026-03-02 23:11 ` Kalra, Ashish
2026-03-02 22:33 ` Dave Hansen
2026-03-06 15:18 ` Borislav Petkov
2026-03-06 15:33 ` Tom Lendacky
2026-03-02 21:36 ` [PATCH v2 3/7] x86/sev: add support for RMPOPT instruction Ashish Kalra
2026-03-02 22:57 ` Dave Hansen
2026-03-02 23:09 ` Kalra, Ashish
2026-03-02 23:15 ` Dave Hansen
2026-03-04 15:56 ` Andrew Cooper
2026-03-04 16:03 ` Dave Hansen
2026-03-25 21:53 ` Kalra, Ashish
2026-03-26 0:40 ` Andrew Cooper
2026-03-26 2:02 ` Kalra, Ashish
2026-03-26 2:14 ` Kalra, Ashish
2026-03-04 15:01 ` Sean Christopherson
2026-03-04 15:25 ` Dave Hansen
2026-03-04 15:32 ` Dave Hansen [this message]
2026-03-05 1:40 ` Kalra, Ashish
2026-03-05 19:22 ` Kalra, Ashish
2026-03-05 19:40 ` Dave Hansen
2026-03-11 21:24 ` Kalra, Ashish
2026-03-11 22:20 ` Dave Hansen
2026-03-16 19:03 ` Kalra, Ashish
2026-03-18 14:00 ` Dave Hansen
2026-03-02 21:36 ` [PATCH v2 4/7] x86/sev: Add interface to re-enable RMP optimizations Ashish Kalra
2026-03-02 21:36 ` [PATCH v2 5/7] KVM: guest_memfd: Add cleanup interface for guest teardown Ashish Kalra
2026-03-09 9:01 ` Ackerley Tng
2026-03-10 22:18 ` Kalra, Ashish
2026-03-11 6:00 ` Ackerley Tng
2026-03-11 21:49 ` Kalra, Ashish
2026-03-27 17:16 ` Ackerley Tng
2026-03-02 21:37 ` [PATCH v2 6/7] KVM: SEV: Implement SEV-SNP specific guest cleanup Ashish Kalra
2026-03-02 21:37 ` [PATCH v2 7/7] x86/sev: Add debugfs support for RMPOPT Ashish Kalra
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