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From: Matthew Wilcox <willy@infradead.org>
To: Marc Orr <marcorr@google.com>
Cc: Jim Mattson <jmattson@google.com>,
	Wanpeng Li <kernellwp@gmail.com>,
	kvm@vger.kernel.org, David Rientjes <rientjes@google.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	linux-mm@kvack.org, akpm@linux-foundation.org,
	pbonzini@redhat.com, rkrcmar@redhat.com,
	sean.j.christopherson@intel.com
Subject: Re: [kvm PATCH v4 0/2] use vmalloc to allocate vmx vcpus
Date: Wed, 31 Oct 2018 07:21:22 -0700	[thread overview]
Message-ID: <20181031142122.GM10491@bombadil.infradead.org> (raw)
In-Reply-To: <CAA03e5F+o5svBe1HTOHukD6Z6ctnKB96+SQTfMZX39uhP2AS0g@mail.gmail.com>

On Wed, Oct 31, 2018 at 01:48:44PM +0000, Marc Orr wrote:
> Thanks for the explanation. Is there a way to dynamically detect the
> memory allocation done by kvmalloc() (i.e., kmalloc() or vmalloc())?
> If so, we could use kvmalloc(), and add two code paths to do the
> physical mapping, according to whether the underlying memory was
> allocated with kmalloc() or vmalloc().

Yes -- it's used in the implementation of kvfree():

        if (is_vmalloc_addr(addr))
                vfree(addr);
        else
                kfree(addr);

  reply	other threads:[~2018-10-31 14:21 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-26  7:58 [kvm PATCH v4 0/2] use vmalloc to allocate vmx vcpus Marc Orr
2018-10-26  7:58 ` [kvm PATCH v4 1/2] kvm: vmx: refactor vmx_msrs struct for vmalloc Marc Orr
2018-10-26 11:02   ` Sean Christopherson
2018-10-26  7:59 ` [kvm PATCH v4 2/2] kvm: vmx: use vmalloc() to allocate vcpus Marc Orr
2018-10-26 12:29 ` [kvm PATCH v4 0/2] use vmalloc to allocate vmx vcpus Matthew Wilcox
2018-10-26 14:45   ` Matthew Wilcox
2018-10-26 14:49     ` Dave Hansen
2018-10-31 13:06       ` Marc Orr
2018-10-29  1:58 ` Wanpeng Li
2018-10-29 16:25   ` Jim Mattson
2018-10-29 16:48     ` Matthew Wilcox
2018-10-29 18:12       ` Jim Mattson
2018-10-29 19:16         ` Marc Orr
2018-10-29 19:22           ` Marc Orr
2018-10-31 13:17       ` Marc Orr
2018-10-31 13:27         ` Matthew Wilcox
2018-10-31 13:48           ` Marc Orr
2018-10-31 14:21             ` Matthew Wilcox [this message]
2018-10-31 21:19               ` Marc Orr

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