linux-kernel - Re: [PATCH v8 20/43] arm64: RME: Runtime faulting of memory

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Message-ID: <22a6cdd0-4fa3-4548-9c9f-ce8605694261@arm.com>
Date: Tue, 20 May 2025 15:58:46 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Steven Price <steven.price@....com>, kvm@...r.kernel.org,
 kvmarm@...ts.linux.dev
Cc: Catalin Marinas <catalin.marinas@....com>, Marc Zyngier <maz@...nel.org>,
 Will Deacon <will@...nel.org>, James Morse <james.morse@....com>,
 Oliver Upton <oliver.upton@...ux.dev>, Zenghui Yu <yuzenghui@...wei.com>,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Joey Gouly <joey.gouly@....com>, Alexandru Elisei
 <alexandru.elisei@....com>, Christoffer Dall <christoffer.dall@....com>,
 Fuad Tabba <tabba@...gle.com>, linux-coco@...ts.linux.dev,
 Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
 Gavin Shan <gshan@...hat.com>, Shanker Donthineni <sdonthineni@...dia.com>,
 Alper Gun <alpergun@...gle.com>, "Aneesh Kumar K . V"
 <aneesh.kumar@...nel.org>
Subject: Re: [PATCH v8 20/43] arm64: RME: Runtime faulting of memory

On 19/05/2025 18:35, Suzuki K Poulose wrote:
> Hi Steven
> 
> On 16/04/2025 14:41, Steven Price wrote:
>> At runtime if the realm guest accesses memory which hasn't yet been
>> mapped then KVM needs to either populate the region or fault the guest.
>>
>> For memory in the lower (protected) region of IPA a fresh page is
>> provided to the RMM which will zero the contents. For memory in the
>> upper (shared) region of IPA, the memory from the memslot is mapped
>> into the realm VM non secure.
>>
>> Signed-off-by: Steven Price <steven.price@....com>

>> +    } else {
>> +        map_level = 3;
>> +        map_size = RMM_PAGE_SIZE;
>> +    }
>> +
>> +    for (offset = 0; offset < size; offset += map_size) {
>> +        /*
>> +         * realm_map_ipa() enforces that the memory is writable,
> 
> The function names seems to be obsolete, please fix.

Doh, it is in arch/arm64/kvm/mmu.c, please ignore this comment.

Suzuki