From: Aneesh Kumar K.V <aneesh.kumar@kernel.org>
To: Kameron Carr <kameroncarr@linux.microsoft.com>,
linux-coco@lists.linux.dev, kvmarm@lists.linux.dev,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Cc: Alexey Kardashevskiy <aik@amd.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Dan Williams <dan.j.williams@intel.com>,
Jason Gunthorpe <jgg@ziepe.ca>,
Jonathan Cameron <jic23@kernel.org>,
Marc Zyngier <maz@kernel.org>, Samuel Ortiz <sameo@rivosinc.com>,
Steven Price <steven.price@arm.com>,
Suzuki K Poulose <Suzuki.Poulose@arm.com>,
Will Deacon <will@kernel.org>,
Xu Yilun <yilun.xu@linux.intel.com>
Subject: Re: [RFC PATCH v4 07/11] coco: guest: arm64: Add guest APIs to read host-cached DA objects
Date: Thu, 20 Aug 2026 16:43:29 +0530 [thread overview]
Message-ID: <yq5ao6exvycm.fsf@kernel.org> (raw)
In-Reply-To: <36877aa6-3f70-4da1-aecb-7209a33f8595@linux.microsoft.com>
Kameron Carr <kameroncarr@linux.microsoft.com> writes:
>> diff --git a/drivers/virt/coco/arm-cca-guest/rsi-da.h b/drivers/virt/coco/arm-cca-guest/rsi-da.h
>> index 297cb800edc0..88067d2230ab 100644
>> --- a/drivers/virt/coco/arm-cca-guest/rsi-da.h
>> +++ b/drivers/virt/coco/arm-cca-guest/rsi-da.h
>> @@ -10,6 +10,8 @@
>> #include <linux/pci-tsm.h>
>> #include <asm/rsi_smc.h>
>>
>> +#define MAX_CACHE_OBJ_SIZE SZ_16M
>
> Why is the limit 16 MiB? I don't see that limitation in the RHI spec.
> Does the limit come from PCI TSM?
>
I based that on the SPDM MeasurementRecordLength, which is 16 MB.
-aneesh
next prev parent reply other threads:[~2026-08-20 11:13 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-27 8:27 [RFC PATCH v4 00/11] coco/TSM: Arm CCA guest TDISP lock/accept flow with verification and DMA enable Aneesh Kumar K.V (Arm)
2026-04-27 8:27 ` [RFC PATCH v4 01/11] coco: guest: arm64: Guest TSM callback and realm device lock support Aneesh Kumar K.V (Arm)
2026-04-27 8:27 ` [RFC PATCH v4 02/11] coco: guest: arm64: Fix a typo in the ARM_CCA_GUEST Kconfig help string ("and" -> "an") Aneesh Kumar K.V (Arm)
2026-04-27 8:27 ` [RFC PATCH v4 03/11] coco: guest: arm64: Add Realm Host Interface and guest DA helper Aneesh Kumar K.V (Arm)
2026-04-27 8:27 ` [RFC PATCH v4 04/11] coco: guest: arm64: Support guest-initiated TDI lock/unlock transitions Aneesh Kumar K.V (Arm)
2026-04-27 8:27 ` [RFC PATCH v4 05/11] coco: guest: arm64: Refresh interface-report cache during device lock Aneesh Kumar K.V (Arm)
2026-04-27 8:28 ` [RFC PATCH v4 06/11] coco: guest: arm64: Add measurement refresh via RHI_DA_VDEV_GET_MEASUREMENTS Aneesh Kumar K.V (Arm)
2026-04-27 8:28 ` [RFC PATCH v4 07/11] coco: guest: arm64: Add guest APIs to read host-cached DA objects Aneesh Kumar K.V (Arm)
2026-08-18 17:43 ` Kameron Carr
2026-08-20 11:13 ` Aneesh Kumar K.V [this message]
2026-04-27 8:28 ` [RFC PATCH v4 08/11] coco: guest: arm64: Verify DA evidence with RSI_VDEV_GET_INFO digests Aneesh Kumar K.V (Arm)
2026-08-19 16:43 ` Kameron Carr
2026-08-20 11:18 ` Aneesh Kumar K.V
2026-04-27 8:28 ` [RFC PATCH v4 09/11] coco: guest: arm64: Hook TSM accept to Realm TDISP RUN transition Aneesh Kumar K.V (Arm)
2026-04-27 8:28 ` [RFC PATCH v4 10/11] coco: arm64: dma: Update force_dma_unencrypted for accepted devices Aneesh Kumar K.V (Arm)
2026-04-27 8:28 ` [RFC PATCH v4 11/11] coco: guest: arm64: Enable vdev DMA after attestation Aneesh Kumar K.V (Arm)
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