From: Jim Mattson <jmattson@google.com>
To: KarimAllah Ahmed <karahmed@amazon.com>
Cc: "KarimAllah Ahmed" <karahmed@amazon.de>,
LKML <linux-kernel@vger.kernel.org>,
"kvm list" <kvm@vger.kernel.org>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>
Subject: Re: [RFC 03/12] KVM/VMX: Use the new host mapping API for virtual_apic_page
Date: Fri, 9 Feb 2018 14:55:47 -0800 [thread overview]
Message-ID: <CALMp9eQPLwT5Fd2J_uKpW0OymbL6RQ1bSbsU=xXwbfP=sBFs9g@mail.gmail.com> (raw)
In-Reply-To: <b12b9a53-2793-5317-bc59-535b615eb903@amazon.com>
On Fri, Feb 9, 2018 at 4:15 AM, KarimAllah Ahmed <karahmed@amazon.com> wrote:
> Can you elaborate a bit? I do not really understand what is the concern.
I can't find the posting that gave me this impression. The only thing
I can find is the following in Documentation/vm/highmem.txt:
(*) kmap(). This permits a short duration mapping of a single page. It needs
global synchronization, but is amortized somewhat. It is also prone to
deadlocks when using in a nested fashion, and so it is not recommended for
new code.
What constitutes a "short duration," and does this new usage qualify?
next prev parent reply other threads:[~2018-02-09 22:55 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-05 18:47 [RFC 00/12] KVM/X86: Introduce a new guest mapping API KarimAllah Ahmed
2018-02-05 18:47 ` [RFC 01/12] KVM: Introduce helper functions to map/unmap guest memory KarimAllah Ahmed
2018-02-05 18:47 ` [RFC 02/12] KVM/VMX: Use the new host mapping API for apic_access_page KarimAllah Ahmed
2018-02-05 19:27 ` Jim Mattson
2018-02-05 18:47 ` [RFC 03/12] KVM/VMX: Use the new host mapping API for virtual_apic_page KarimAllah Ahmed
2018-02-05 22:26 ` Jim Mattson
2018-02-09 12:15 ` KarimAllah Ahmed
2018-02-09 22:55 ` Jim Mattson [this message]
2018-02-05 18:47 ` [RFC 04/12] KVM/VMX: Use the new host mapping API for pi_desc_page KarimAllah Ahmed
2018-02-05 18:47 ` [RFC 05/12] KVM/VMX: Use the new host mapping API for mapping nested vmptr KarimAllah Ahmed
2018-02-05 22:15 ` Jim Mattson
2018-02-08 18:51 ` KarimAllah Ahmed
2018-02-05 18:47 ` [RFC 06/12] KVM/VMX: Use the new host mapping API for handle_vmptrld KarimAllah Ahmed
2018-02-05 18:47 ` [RFC 07/12] KVM/VMX: Use the new host mapping API for mapping L12 MSR bitmap KarimAllah Ahmed
2018-02-05 18:47 ` [RFC 08/12] KVM/VMX: Use the new host mapping API for mapping nested PML KarimAllah Ahmed
2018-02-05 18:47 ` [RFC 09/12] KVM/VMX: Use the new host mapping API for cmpxchg_emulated KarimAllah Ahmed
2018-02-05 18:47 ` [RFC 10/12] KVM/VMX: Use the new host mapping API for synic_clear_sint_msg_pending KarimAllah Ahmed
2018-02-05 18:47 ` [RFC 11/12] KVM/VMX: Use the new host mapping API for synic_deliver_msg KarimAllah Ahmed
2018-02-05 18:47 ` [RFC 12/12] KVM/VMX: Remove kvm_vcpu_gpa_to_page as it is now unused KarimAllah Ahmed
2018-02-05 19:26 ` [RFC 00/12] KVM/X86: Introduce a new guest mapping API Mihai Donțu
2018-02-10 11:33 ` KarimAllah Ahmed
2018-02-16 11:40 ` Mihai Donțu
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