From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Marc Orr <marcorr@google.com>,
kvm@vger.kernel.org, jmattson@google.com, rientjes@google.com,
konrad.wilk@oracle.com, linux-mm@kvack.org,
akpm@linux-foundation.org, pbonzini@redhat.com,
rkrcmar@redhat.com, willy@infradead.org,
dave.hansen@linux.intel.com, kernellwp@gmail.com
Subject: Re: [kvm PATCH v5 3/4] kvm: vmx: refactor vmx_msrs struct for vmalloc
Date: Wed, 31 Oct 2018 07:15:48 -0700 [thread overview]
Message-ID: <20181031141547.GA13907@linux.intel.com> (raw)
In-Reply-To: <ea8abaf5-8c8b-1484-c6d7-e5d110e45f48@intel.com>
On Wed, Oct 31, 2018 at 07:12:16AM -0700, Dave Hansen wrote:
> On 10/31/18 6:26 AM, Marc Orr wrote:
> > +/*
> > + * To prevent vmx_msr_entry array from crossing a page boundary, require:
> > + * sizeof(*vmx_msrs.vmx_msr_entry.val) to be a power of two. This is guaranteed
> > + * through compile-time asserts that:
> > + * - NR_AUTOLOAD_MSRS * sizeof(struct vmx_msr_entry) is a power of two
> > + * - NR_AUTOLOAD_MSRS * sizeof(struct vmx_msr_entry) <= PAGE_SIZE
> > + * - The allocation of vmx_msrs.vmx_msr_entry.val is aligned to its size.
> > + */
>
> Why do we need to prevent them from crossing a page boundary?
The VMCS takes the physical address of the load/store lists. I
requested that this information be added to the changelog. Marc
deferred addressing my comments since there's a decent chance
patches 3/4 and 4/4 will be dropped in the end.
next prev parent reply other threads:[~2018-10-31 14:15 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-31 13:26 [kvm PATCH v5 0/4] shrink vcpu_vmx down to order 2 Marc Orr
2018-10-31 13:26 ` [kvm PATCH v5 1/4] kvm: x86: Use task structs fpu field for user Marc Orr
2018-10-31 13:26 ` [kvm PATCH v5 2/4] kvm: x86: Dynamically allocate guest_fpu Marc Orr
2018-10-31 14:11 ` Dave Hansen
2018-10-31 21:13 ` Marc Orr
2018-10-31 21:21 ` Dave Hansen
2018-10-31 21:24 ` Marc Orr
2018-10-31 21:30 ` Dave Hansen
2018-10-31 21:39 ` Marc Orr
2018-10-31 21:44 ` Dave Hansen
2018-10-31 13:26 ` [kvm PATCH v5 3/4] kvm: vmx: refactor vmx_msrs struct for vmalloc Marc Orr
2018-10-31 14:12 ` Dave Hansen
2018-10-31 14:15 ` Sean Christopherson [this message]
2018-10-31 14:19 ` Marc Orr
2018-10-31 13:26 ` [kvm PATCH v5 4/4] kvm: vmx: use vmalloc() to allocate vcpus Marc Orr
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20181031141547.GA13907@linux.intel.com \
--to=sean.j.christopherson@intel.com \
--cc=akpm@linux-foundation.org \
--cc=dave.hansen@intel.com \
--cc=dave.hansen@linux.intel.com \
--cc=jmattson@google.com \
--cc=kernellwp@gmail.com \
--cc=konrad.wilk@oracle.com \
--cc=kvm@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=marcorr@google.com \
--cc=pbonzini@redhat.com \
--cc=rientjes@google.com \
--cc=rkrcmar@redhat.com \
--cc=willy@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.