From: Dave Hansen <dave.hansen@intel.com>
To: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H . Peter Anvin" <hpa@zytor.com>,
Dan Williams <dan.j.williams@intel.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Jane Chu <jane.chu@oracle.com>,
"Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>,
Sean Christopherson <seanjc@google.com>,
Tianyu Lan <Tianyu.Lan@microsoft.com>,
Mike Rapoport <rppt@kernel.org>,
Rick Edgecombe <rick.p.edgecombe@intel.com>,
linux-mm@kvack.org, Borislav Petkov <bp@alien8.de>,
x86@kernel.org
Subject: Re: [RFC 1/2] x86/mm/cpa: always fail when user address is passed
Date: Thu, 7 Jul 2022 13:24:31 -0700 [thread overview]
Message-ID: <7e89459c-41de-3d14-a87a-905150d47e3a@intel.com> (raw)
In-Reply-To: <YrAq+LU0+Z/iMRDD@hyeyoo>
On 6/20/22 01:08, Hyeonggon Yoo wrote:
>> It would, of course, have to be paired with _PAGE_PRESENT checks. This
>> works both on the way in and out of the set_memory code. It shouldn't
>> clear other bits a PTE with _PAGE_PRESENT|_PAGE_USER and
> You mean nothing should not use set_memory code for PTEs with
> _PAGE_USER|_PAGE_PRESENT but set_memory can still be used to clear
> _PAGE_USER|_PAGE_PRESENT?
I don't see a reason why it should be able to clear
_PAGE_USER|_PAGE_PRESENT entries either.
next prev parent reply other threads:[~2022-07-07 20:24 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-14 6:39 [RFC 0/2] CPA improvements Hyeonggon Yoo
2022-06-14 6:39 ` [RFC 1/2] x86/mm/cpa: always fail when user address is passed Hyeonggon Yoo
2022-06-14 17:52 ` Edgecombe, Rick P
2022-06-15 3:26 ` Hyeonggon Yoo
2022-06-15 18:17 ` Edgecombe, Rick P
2022-06-14 18:31 ` Dave Hansen
2022-06-16 8:49 ` Hyeonggon Yoo
2022-06-16 14:20 ` Dave Hansen
2022-06-20 8:08 ` Hyeonggon Yoo
2022-07-07 20:24 ` Dave Hansen [this message]
2022-06-15 13:11 ` Christoph Hellwig
2022-06-16 8:51 ` Hyeonggon Yoo
2022-06-14 6:39 ` [RFC 2/2] x86/mm/cpa: drop pgprot_clear_protnone_bits() Hyeonggon Yoo
2022-06-14 6:53 ` Hyeonggon Yoo
2022-06-14 18:23 ` Edgecombe, Rick P
2022-06-15 3:47 ` Hyeonggon Yoo
2022-06-15 18:18 ` Edgecombe, Rick P
2022-06-19 12:20 ` Hyeonggon Yoo
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