From: Paolo Bonzini <pbonzini@redhat.com>
To: KarimAllah Ahmed <karahmed@amazon.de>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
x86@kernel.org
Cc: "Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"H . Peter Anvin" <hpa@zytor.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Borislav Petkov" <bp@suse.de>,
"Denys Vlasenko" <dvlasenk@redhat.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Toshi Kani" <toshi.kani@hpe.com>,
"Tony Luck" <tony.luck@intel.com>
Subject: Re: [PATCH] kvm, x86: Properly check whether a pfn is an MMIO or not
Date: Wed, 22 Jun 2016 15:41:42 +0200 [thread overview]
Message-ID: <6b30fd96-dc04-13a2-aa8b-7760a85337c6@redhat.com> (raw)
In-Reply-To: <1466562866-31524-1-git-send-email-karahmed@amazon.de>
On 22/06/2016 04:34, KarimAllah Ahmed wrote:
> pfn_valid check is not sufficient because it only checks if a page has a struct
> page or not, if for example "mem=" was passed to the kernel some valid pages
> won't have a struct page. This means that if guests were assigned valid memory
> that lies after the mem= boundary it will be passed uncached to the guest no
> matter what the guest caching attributes are for this memory.
How can you pass memory after the mem= boundary to the guest?
Paolo
next prev parent reply other threads:[~2016-06-22 13:41 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-22 2:34 KarimAllah Ahmed
2016-06-22 13:41 ` Paolo Bonzini [this message]
2016-06-22 14:11 ` Raslan, KarimAllah
2016-09-15 5:54 ` Raslan, KarimAllah
2016-09-15 6:22 ` Paolo Bonzini
2016-09-15 16:04 ` Kani, Toshimitsu
2016-09-15 16:22 ` Paolo Bonzini
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