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From: Andi Kleen <ak@linux.intel.com>
To: David Hildenbrand <david@redhat.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Andy Lutomirski <luto@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Sean Christopherson <seanjc@google.com>,
	Jim Mattson <jmattson@google.com>,
	David Rientjes <rientjes@google.com>, "Edgecombe\,
	Rick P" <rick.p.edgecombe@intel.com>, "Kleen\,
	Andi" <andi.kleen@intel.com>, "Yamahata\,
	Isaku" <isaku.yamahata@intel.com>,
	x86@kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Oscar Salvador <osalvador@suse.de>,
	Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Subject: Re: [RFCv1 7/7] KVM: unmap guest memory using poisoned pages
Date: Wed, 07 Apr 2021 08:10:40 -0700	[thread overview]
Message-ID: <87v98yuo3z.fsf@linux.intel.com> (raw)
In-Reply-To: <5e934d94-414c-90de-c58e-34456e4ab1cf@redhat.com> (David Hildenbrand's message of "Wed, 7 Apr 2021 16:55:54 +0200")

David Hildenbrand <david@redhat.com> writes:

> I have no idea how expensive would be bouncing writes (and reads?)
> through the kernel. Did you ever experiment with that/evaluate that?

I would expect it to be quite expensive, as in virtio IO performance
tanking.

-Andi

  reply	other threads:[~2021-04-07 15:10 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-02 15:26 [RFCv1 0/7] TDX and guest memory unmapping Kirill A. Shutemov
2021-04-02 15:26 ` [RFCv1 1/7] x86/mm: Move force_dma_unencrypted() to common code Kirill A. Shutemov
2021-04-02 15:26 ` [RFCv1 2/7] x86/kvm: Introduce KVM memory protection feature Kirill A. Shutemov
2021-04-08  9:52   ` Borislav Petkov
2021-04-09 13:36     ` Kirill A. Shutemov
2021-04-09 14:37       ` Borislav Petkov
2021-04-02 15:26 ` [RFCv1 3/7] x86/kvm: Make DMA pages shared Kirill A. Shutemov
2021-04-02 15:26 ` [RFCv1 4/7] x86/kvm: Use bounce buffers for KVM memory protection Kirill A. Shutemov
2021-04-02 15:26 ` [RFCv1 5/7] x86/kvmclock: Share hvclock memory with the host Kirill A. Shutemov
2021-04-02 15:26 ` [RFCv1 6/7] x86/realmode: Share trampoline area if KVM memory protection enabled Kirill A. Shutemov
2021-04-02 15:26 ` [RFCv1 7/7] KVM: unmap guest memory using poisoned pages Kirill A. Shutemov
2021-04-06  7:44   ` David Hildenbrand
2021-04-06 10:50     ` Kirill A. Shutemov
2021-04-06 14:33     ` Dave Hansen
2021-04-06 14:57       ` David Hildenbrand
2021-04-07 13:16         ` Kirill A. Shutemov
2021-04-07 13:31           ` Christophe de Dinechin
2021-04-07 14:09             ` Andi Kleen
2021-04-07 14:09               ` Andi Kleen
2021-04-07 14:09           ` David Hildenbrand
2021-04-07 14:36             ` Kirill A. Shutemov
2021-04-06 17:52       ` Tom Lendacky
2021-04-07 14:55   ` David Hildenbrand
2021-04-07 15:10     ` Andi Kleen [this message]
2021-04-07 15:10       ` Andi Kleen
2021-04-09 13:33     ` Kirill A. Shutemov
2021-04-09 13:50       ` David Hildenbrand
2021-04-09 14:12         ` Kirill A. Shutemov
2021-04-09 14:18           ` David Hildenbrand

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