[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <01f08a52-3b96-4384-b9cf-aa74ea1d5faf@redhat.com>
Date: Tue, 8 Oct 2024 12:51:20 +1000
From: Gavin Shan <gshan@...hat.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>,
Suzuki K Poulose <suzuki.poulose@....com>, 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>,
Shanker Donthineni <sdonthineni@...dia.com>, Alper Gun
<alpergun@...gle.com>, "Aneesh Kumar K . V" <aneesh.kumar@...nel.org>
Subject: Re: [PATCH v6 07/11] arm64: Enforce bounce buffers for realm DMA
On 10/5/24 12:43 AM, Steven Price wrote:
> Within a realm guest it's not possible for a device emulated by the VMM
> to access arbitrary guest memory. So force the use of bounce buffers to
> ensure that the memory the emulated devices are accessing is in memory
> which is explicitly shared with the host.
>
> This adds a call to swiotlb_update_mem_attributes() which calls
> set_memory_decrypted() to ensure the bounce buffer memory is shared with
> the host. For non-realm guests or hosts this is a no-op.
>
> Reviewed-by: Catalin Marinas <catalin.marinas@....com>
> Co-developed-by: Suzuki K Poulose <suzuki.poulose@....com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> Signed-off-by: Steven Price <steven.price@....com>
> ---
> v3: Simplify mem_init() by using a 'flags' variable.
> ---
> arch/arm64/kernel/rsi.c | 1 +
> arch/arm64/mm/init.c | 10 +++++++++-
> 2 files changed, 10 insertions(+), 1 deletion(-)
>
Reviewed-by: Gavin Shan <gshan@...hat.com>
Powered by blists - more mailing lists