From: Tianyu Lan <ltykernel@gmail.com>
To: Christoph Hellwig <hch@lst.de>
Cc: kys@microsoft.com, haiyangz@microsoft.com,
sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com,
tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
x86@kernel.org, hpa@zytor.com, arnd@arndb.de,
dave.hansen@linux.intel.com, luto@kernel.org,
peterz@infradead.org, akpm@linux-foundation.org,
kirill.shutemov@linux.intel.com, rppt@kernel.org,
hannes@cmpxchg.org, cai@lca.pw, krish.sadhukhan@oracle.com,
saravanand@fb.com, Tianyu.Lan@microsoft.com,
konrad.wilk@oracle.com, m.szyprowski@samsung.com,
robin.murphy@arm.com, boris.ostrovsky@oracle.com,
jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org,
will@kernel.org, xen-devel@lists.xenproject.org,
davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com,
martin.petersen@oracle.com, iommu@lists.linux-foundation.org,
linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
netdev@vger.kernel.org, vkuznets@redhat.com,
thomas.lendacky@amd.com, brijesh.singh@amd.com,
sunilmut@microsoft.com
Subject: Re: [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address setting function
Date: Mon, 14 Jun 2021 21:37:01 +0800 [thread overview]
Message-ID: <3e64e59b-7440-69a5-75c5-43225f3d6c0a@gmail.com> (raw)
In-Reply-To: <20210614071223.GA30171@lst.de>
On 6/14/2021 3:12 PM, Christoph Hellwig wrote:
> On Mon, Jun 07, 2021 at 10:56:47PM +0800, Tianyu Lan wrote:
>> These addresses in extra address space works as system memory mirror. The
>> shared memory with host in Isolation VM needs to be accessed via extra
>> address space which is above shared gpa boundary.
>
> Why?
>
The shared_gpa_boundary in the AMD SEV SNP spec is called virtual top of
memory(vTOM). Memory addresses below vTOM are automatically treated as
private while memory above vTOM is treated as shared. Using vTOM to
separate memory in this way avoids the need to augment the standard x86
page tables with C-bit markings, simplifying guest OS software.
WARNING: multiple messages have this Message-ID (diff)
From: Tianyu Lan <ltykernel@gmail.com>
To: Christoph Hellwig <hch@lst.de>
Cc: linux-hyperv@vger.kernel.org, brijesh.singh@amd.com,
peterz@infradead.org, dave.hansen@linux.intel.com, hpa@zytor.com,
kys@microsoft.com, will@kernel.org, boris.ostrovsky@oracle.com,
linux-arch@vger.kernel.org, wei.liu@kernel.org,
sstabellini@kernel.org, sthemmin@microsoft.com,
linux-scsi@vger.kernel.org, x86@kernel.org, decui@microsoft.com,
mingo@redhat.com, xen-devel@lists.xenproject.org,
jejb@linux.ibm.com, thomas.lendacky@amd.com,
Tianyu.Lan@microsoft.com, arnd@arndb.de, konrad.wilk@oracle.com,
haiyangz@microsoft.com, kuba@kernel.org, bp@alien8.de,
luto@kernel.org, krish.sadhukhan@oracle.com, tglx@linutronix.de,
vkuznets@redhat.com, jgross@suse.com, martin.petersen@oracle.com,
saravanand@fb.com, netdev@vger.kernel.org,
sunilmut@microsoft.com, linux-kernel@vger.kernel.org,
iommu@lists.linux-foundation.org,
kirill.shutemov@linux.intel.com, hannes@cmpxchg.org, cai@lca.pw,
akpm@linux-foundation.org, robin.murphy@arm.com,
davem@davemloft.net, rppt@kernel.org
Subject: Re: [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address setting function
Date: Mon, 14 Jun 2021 21:37:01 +0800 [thread overview]
Message-ID: <3e64e59b-7440-69a5-75c5-43225f3d6c0a@gmail.com> (raw)
In-Reply-To: <20210614071223.GA30171@lst.de>
On 6/14/2021 3:12 PM, Christoph Hellwig wrote:
> On Mon, Jun 07, 2021 at 10:56:47PM +0800, Tianyu Lan wrote:
>> These addresses in extra address space works as system memory mirror. The
>> shared memory with host in Isolation VM needs to be accessed via extra
>> address space which is above shared gpa boundary.
>
> Why?
>
The shared_gpa_boundary in the AMD SEV SNP spec is called virtual top of
memory(vTOM). Memory addresses below vTOM are automatically treated as
private while memory above vTOM is treated as shared. Using vTOM to
separate memory in this way avoids the need to augment the standard x86
page tables with C-bit markings, simplifying guest OS software.
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next prev parent reply other threads:[~2021-06-14 13:37 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-30 15:06 [RFC PATCH V3 00/11] x86/Hyper-V: Add Hyper-V Isolation VM support Tianyu Lan
2021-05-30 15:06 ` Tianyu Lan
2021-05-30 15:06 ` [RFC PATCH V3 01/11] x86/HV: Initialize GHCB page in Isolation VM Tianyu Lan
2021-05-30 15:06 ` Tianyu Lan
2021-06-07 6:41 ` Christoph Hellwig
2021-06-07 6:41 ` Christoph Hellwig
2021-06-07 8:14 ` Tianyu Lan
2021-06-07 8:14 ` Tianyu Lan
2021-06-09 12:38 ` Joerg Roedel
2021-06-09 12:38 ` Joerg Roedel
2021-06-10 14:13 ` Tianyu Lan
2021-06-10 14:13 ` Tianyu Lan
2021-05-30 15:06 ` [RFC PATCH V3 02/11] x86/HV: Initialize shared memory boundary in the " Tianyu Lan
2021-05-30 15:06 ` Tianyu Lan
2021-05-30 15:06 ` [RFC PATCH V3 03/11] x86/Hyper-V: Add new hvcall guest address host visibility support Tianyu Lan
2021-05-30 15:06 ` Tianyu Lan
2021-05-30 18:25 ` Borislav Petkov
2021-05-30 18:25 ` Borislav Petkov
2021-05-31 4:08 ` Tianyu Lan
2021-05-31 4:08 ` Tianyu Lan
2021-06-10 9:47 ` Vitaly Kuznetsov
2021-06-10 9:47 ` Vitaly Kuznetsov
2021-06-10 14:18 ` Tianyu Lan
2021-06-10 14:18 ` Tianyu Lan
2021-05-30 15:06 ` [RFC PATCH V3 04/11] HV: Add Write/Read MSR registers via ghcb Tianyu Lan
2021-05-30 15:06 ` Tianyu Lan
2021-06-09 12:46 ` Joerg Roedel
2021-06-09 12:46 ` Joerg Roedel
2021-06-10 14:15 ` Tianyu Lan
2021-06-10 14:15 ` Tianyu Lan
2021-05-30 15:06 ` [RFC PATCH V3 05/11] HV: Add ghcb hvcall support for SNP VM Tianyu Lan
2021-05-30 15:06 ` Tianyu Lan
2021-06-09 12:49 ` Joerg Roedel
2021-06-09 12:49 ` Joerg Roedel
2021-05-30 15:06 ` [RFC PATCH V3 06/11] HV/Vmbus: Add SNP support for VMbus channel initiate message Tianyu Lan
2021-05-30 15:06 ` Tianyu Lan
2021-05-30 15:06 ` [RFC PATCH V3 07/11] HV/Vmbus: Initialize VMbus ring buffer for Isolation VM Tianyu Lan
2021-05-30 15:06 ` Tianyu Lan
2021-05-30 15:06 ` [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address setting function Tianyu Lan
2021-05-30 15:06 ` Tianyu Lan
2021-06-07 6:43 ` Christoph Hellwig
2021-06-07 6:43 ` Christoph Hellwig
2021-06-07 14:56 ` Tianyu Lan
2021-06-07 14:56 ` Tianyu Lan
2021-06-10 14:25 ` Tianyu Lan
2021-06-10 14:25 ` Tianyu Lan
2021-06-14 7:12 ` Christoph Hellwig
2021-06-14 7:12 ` Christoph Hellwig
2021-06-14 13:29 ` Tom Lendacky
2021-06-14 13:29 ` Tom Lendacky via iommu
2021-06-14 13:37 ` Tianyu Lan [this message]
2021-06-14 13:37 ` Tianyu Lan
2021-06-14 13:42 ` Tianyu Lan
2021-06-14 13:42 ` Tianyu Lan
2021-06-14 13:49 ` Robin Murphy
2021-06-14 13:49 ` Robin Murphy
2021-06-14 15:32 ` Christoph Hellwig
2021-06-14 15:32 ` Christoph Hellwig
2021-06-15 15:24 ` Tianyu Lan
2021-06-15 15:24 ` Tianyu Lan
2021-07-12 9:40 ` Tianyu Lan
2021-07-12 9:40 ` Tianyu Lan
2021-05-30 15:06 ` [RFC PATCH V3 09/11] HV/IOMMU: Enable swiotlb bounce buffer for Isolation VM Tianyu Lan
2021-05-30 15:06 ` Tianyu Lan
2021-06-02 1:16 ` Boris Ostrovsky
2021-06-02 1:16 ` Boris Ostrovsky
2021-06-02 15:01 ` Tianyu Lan
2021-06-02 15:01 ` Tianyu Lan
2021-06-02 16:02 ` Boris Ostrovsky
2021-06-02 16:02 ` Boris Ostrovsky
2021-06-03 15:37 ` Tianyu Lan
2021-06-03 15:37 ` Tianyu Lan
2021-06-03 17:04 ` Boris Ostrovsky
2021-06-03 17:04 ` Boris Ostrovsky
2021-06-07 6:44 ` Christoph Hellwig
2021-06-07 6:44 ` Christoph Hellwig
2021-05-30 15:06 ` [RFC PATCH V3 10/11] HV/Netvsc: Add Isolation VM support for netvsc driver Tianyu Lan
2021-05-30 15:06 ` Tianyu Lan
2021-06-07 6:50 ` Christoph Hellwig
2021-06-07 6:50 ` Christoph Hellwig
2021-06-07 15:21 ` Tianyu Lan
2021-06-07 15:21 ` Tianyu Lan
2021-06-14 7:09 ` Christoph Hellwig
2021-06-14 7:09 ` Christoph Hellwig
2021-06-14 14:04 ` Tianyu Lan
2021-06-14 14:04 ` Tianyu Lan
2021-06-14 15:33 ` Christoph Hellwig
2021-06-14 15:33 ` Christoph Hellwig
2021-06-15 14:31 ` Tianyu Lan
2021-06-15 14:31 ` Tianyu Lan
2021-06-10 9:52 ` Vitaly Kuznetsov
2021-06-10 9:52 ` Vitaly Kuznetsov
2021-05-30 15:06 ` [RFC PATCH V3 11/11] HV/Storvsc: Add Isolation VM support for storvsc driver Tianyu Lan
2021-05-30 15:06 ` Tianyu Lan
2021-06-07 6:46 ` Christoph Hellwig
2021-06-07 6:46 ` Christoph Hellwig
2021-06-07 14:59 ` Tianyu Lan
2021-06-07 14:59 ` Tianyu Lan
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