From: "Kalra, Ashish" <Ashish.Kalra@amd.com>
To: Boris Petkov <bp@alien8.de>
Cc: "x86@kernel.org" <x86@kernel.org>,
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Subject: RE: [PATCH Part2 v6 09/49] x86/fault: Add support to handle the RMP fault for user address
Date: Sat, 3 Sep 2022 17:30:28 +0000 [thread overview]
Message-ID: <SN6PR12MB2767C4C296281D25306885A78E7D9@SN6PR12MB2767.namprd12.prod.outlook.com> (raw)
In-Reply-To: <BC747219-7808-4C39-A17C-A76B35DD6CB3@alien8.de>
[AMD Official Use Only - General]
Hello Boris,
>>So essentially we want to map the faulting address to a RMP entry,
>>considering the fact that a 2M host hugepage can be mapped as 4K RMP table entries and 1G host hugepage can be mapped as 2M RMP table entries.
>So something's seriously confusing or missing here because if you fault on a 2M host page and the underlying RMP entries are 4K then you can use pte_index().
>If the host page is 1G and the underlying RMP entries are 2M, pmd_index() should work here too.
>But this piecemeal back'n'forth doesn't seem to resolve this so I'd like to ask you pls to sit down, take your time and give a detailed example of the two possible cases and what the difference is between pte_/pmd_index and your way. Feel free to >add actual debug output and paste it here.
There is 1 64-bit RMP entry for every physical 4k page of DRAM, so essentially every 4K page of DRAM is represented by a RMP entry.
So even if host page is 1G and underlying (smashed/split) RMP entries are 2M, the RMP table entry has to be indexed to a 4K entry
corresponding to that.
If it was simply a 2M entry in the RMP table, then pmd_index() will work correctly.
Considering the following example:
address = 0x40200000;
level = PG_LEVEL_1G;
pfn = 0x40000;
pfn |= pmd_index(address);
This will give the RMP table index as 0x40001.
And it will work if the RMP table entry was simply a 2MB entry, but we need to map this further to its corresponding 4K entry.
With the same example as above:
level = PG_LEVEL_1G;
mask = pages_per_hpage(level) - pages_per_hpage(level - 1);
pfn |= (address >> PAGE_SHIFT) & mask;
This will give the RMP table index as 0x40200.
Which is the correct RMP table entry for a 2MB smashed/split 1G page mapped further to its corresponding 4K entry.
Hopefully this clarifies why pmd_index() can't be used here.
Thanks,
Ashish
next prev parent reply other threads:[~2022-09-03 17:30 UTC|newest]
Thread overview: 305+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-20 22:56 [PATCH Part2 v6 00/49] Add AMD Secure Nested Paging (SEV-SNP) Ashish Kalra
2022-06-20 22:59 ` [PATCH Part2 v6 01/49] x86/cpufeatures: Add SEV-SNP CPU feature Ashish Kalra
2022-06-21 8:58 ` Borislav Petkov
2022-06-20 22:59 ` [PATCH Part2 v6 02/49] iommu/amd: Introduce function to check SEV-SNP support Ashish Kalra
2022-06-21 15:28 ` Peter Gonda
2022-06-21 17:45 ` Kalra, Ashish
2022-06-21 17:50 ` Peter Gonda
2022-06-22 7:33 ` Suthikulpanit, Suravee
2022-08-25 1:28 ` jarkko
2022-08-25 1:30 ` Jarkko Sakkinen
2022-08-26 18:54 ` Kalra, Ashish
2022-08-28 4:18 ` Jarkko Sakkinen
2022-07-01 10:42 ` Borislav Petkov
2022-07-05 13:56 ` Kalra, Ashish
2022-07-05 14:33 ` Borislav Petkov
2022-07-05 14:53 ` Kalra, Ashish
2022-06-20 23:02 ` [PATCH Part2 v6 03/49] x86/sev: Add the host SEV-SNP initialization support Ashish Kalra
2022-06-21 15:47 ` Peter Gonda
2022-06-21 17:59 ` Kalra, Ashish
2022-06-23 20:48 ` Marc Orr
2022-06-23 22:22 ` Kalra, Ashish
2022-07-17 10:01 ` Borislav Petkov
2022-07-19 3:56 ` Kalra, Ashish
2022-07-19 8:38 ` Borislav Petkov
2022-07-19 11:34 ` Kalra, Ashish
2022-06-20 23:02 ` [PATCH Part2 v6 04/49] x86/sev: set SYSCFG.MFMD Ashish Kalra
2022-06-23 21:00 ` Marc Orr
2022-07-21 11:29 ` Borislav Petkov
2022-08-01 21:16 ` Kalra, Ashish
2022-06-20 23:02 ` [PATCH Part2 v6 05/49] x86/sev: Add RMP entry lookup helpers Ashish Kalra
2022-06-22 14:13 ` Dave Hansen
2022-06-22 14:22 ` Kalra, Ashish
2022-06-22 14:29 ` Dave Hansen
2022-06-22 18:15 ` Kalra, Ashish
2022-06-22 18:17 ` Dave Hansen
2022-06-22 18:34 ` Kalra, Ashish
2022-06-22 18:42 ` Dave Hansen
2022-06-22 19:43 ` Kalra, Ashish
2022-06-22 19:49 ` Dave Hansen
2022-06-22 20:15 ` Kalra, Ashish
2022-06-22 20:58 ` Kalra, Ashish
2022-06-23 22:36 ` Sean Christopherson
2022-06-23 22:43 ` Kalra, Ashish
2022-07-22 11:35 ` Borislav Petkov
2022-07-22 19:04 ` Sean Christopherson
2022-07-22 19:25 ` Borislav Petkov
2022-07-22 19:38 ` Borislav Petkov
2022-08-01 21:53 ` Kalra, Ashish
2022-07-22 22:16 ` Sean Christopherson
2022-07-22 22:25 ` Borislav Petkov
2022-08-01 21:50 ` Kalra, Ashish
2022-06-23 21:30 ` Marc Orr
2022-07-22 11:43 ` Borislav Petkov
2022-08-01 21:45 ` Kalra, Ashish
2022-07-25 14:32 ` Borislav Petkov
2022-08-01 22:04 ` Kalra, Ashish
2022-06-20 23:02 ` [PATCH Part2 v6 06/49] x86/sev: Add helper functions for RMPUPDATE and PSMASH instruction Ashish Kalra
2022-06-21 16:40 ` Dr. David Alan Gilbert
2022-06-21 17:38 ` Kalra, Ashish
2022-06-22 18:17 ` Kalra, Ashish
2022-06-28 10:50 ` Dr. David Alan Gilbert
2022-06-28 17:57 ` Kalra, Ashish
2022-06-28 18:58 ` Dr. David Alan Gilbert
2022-06-28 19:03 ` Dave Hansen
2022-07-25 13:24 ` Borislav Petkov
2022-08-01 23:32 ` Kalra, Ashish
2022-08-02 14:14 ` Borislav Petkov
2022-06-22 14:26 ` Dave Hansen
2022-06-22 18:04 ` Kalra, Ashish
2022-07-24 17:31 ` Dov Murik
2022-08-02 4:49 ` Kalra, Ashish
2022-07-25 14:36 ` Borislav Petkov
2022-08-01 22:31 ` Kalra, Ashish
2022-08-03 20:26 ` Borislav Petkov
2022-06-20 23:03 ` [PATCH Part2 v6 07/49] x86/sev: Invalid pages from direct map when adding it to RMP table Ashish Kalra
2022-06-24 0:06 ` Marc Orr
2022-07-27 17:01 ` Borislav Petkov
2022-08-01 23:57 ` Kalra, Ashish
2022-08-04 12:11 ` Borislav Petkov
2022-11-02 3:12 ` Kalra, Ashish
2022-11-02 11:27 ` Borislav Petkov
2022-12-19 15:00 ` Michael Roth
2022-12-19 20:08 ` Borislav Petkov
2022-12-27 21:49 ` Kalra, Ashish
2022-12-29 17:09 ` Borislav Petkov
2023-01-05 21:46 ` Kalra, Ashish
2023-01-05 22:08 ` Marc Orr
2023-01-05 22:27 ` Kalra, Ashish
2023-01-05 22:31 ` Marc Orr
2022-12-30 15:19 ` Mike Rapoport
2022-06-20 23:03 ` [PATCH Part2 v6 08/49] x86/traps: Define RMP violation #PF error code Ashish Kalra
2022-08-08 13:13 ` Borislav Petkov
2022-06-20 23:03 ` [PATCH Part2 v6 09/49] x86/fault: Add support to handle the RMP fault for user address Ashish Kalra
2022-06-22 14:29 ` Jeremi Piotrowski
2022-07-12 11:57 ` Jarkko Sakkinen
2022-07-12 14:29 ` Kalra, Ashish
2022-07-12 14:54 ` Jarkko Sakkinen
2022-08-09 16:55 ` Borislav Petkov
2022-08-10 3:59 ` Kalra, Ashish
2022-08-10 9:42 ` Borislav Petkov
2022-08-10 22:00 ` Kalra, Ashish
2022-08-11 14:27 ` Borislav Petkov
2022-09-01 20:32 ` Kalra, Ashish
2022-09-02 6:52 ` Borislav Petkov
2022-09-02 15:33 ` Kalra, Ashish
2022-09-03 4:25 ` Borislav Petkov
2022-09-03 5:51 ` Kalra, Ashish
2022-09-03 6:57 ` Kalra, Ashish
2022-09-03 8:31 ` Boris Petkov
2022-09-03 17:30 ` Kalra, Ashish [this message]
2022-09-04 6:37 ` Borislav Petkov
2022-09-06 14:06 ` Kalra, Ashish
2022-09-06 10:25 ` Jarkko Sakkinen
2022-09-06 10:33 ` Jarkko Sakkinen
2022-09-06 13:54 ` Marc Orr
2022-09-06 14:17 ` Kalra, Ashish
2022-09-06 15:06 ` Michael Roth
2022-09-06 16:39 ` Kalra, Ashish
2022-09-07 5:14 ` Marc Orr
2022-09-06 15:44 ` Jarkko Sakkinen
2022-09-08 7:46 ` Jarkko Sakkinen
2022-09-08 7:57 ` Jarkko Sakkinen
2022-08-11 15:15 ` vbabka
2022-09-06 2:30 ` Dave Hansen
2022-06-20 23:03 ` [PATCH Part2 v6 10/49] x86/fault: Add support to dump RMP entry on fault Ashish Kalra
2022-06-22 14:33 ` Jeremi Piotrowski
2022-06-22 14:42 ` Jeremi Piotrowski
2022-06-22 18:08 ` Kalra, Ashish
2022-08-23 13:21 ` Borislav Petkov
2022-06-20 23:04 ` [PATCH Part2 v6 11/49] crypto:ccp: Define the SEV-SNP commands Ashish Kalra
2022-09-20 13:03 ` Borislav Petkov
2022-09-20 13:46 ` Kalra, Ashish
2022-09-20 14:04 ` Borislav Petkov
2022-06-20 23:04 ` [PATCH Part2 v6 12/49] crypto: ccp: Add support to initialize the AMD-SP for SEV-SNP Ashish Kalra
2022-10-01 17:33 ` Borislav Petkov
2022-10-14 21:09 ` Kalra, Ashish
2022-10-14 21:31 ` Kalra, Ashish
2022-10-25 8:56 ` Borislav Petkov
2022-10-19 18:48 ` Kalra, Ashish
2022-10-23 21:17 ` Jarkko Sakkinen
2022-10-25 9:07 ` Borislav Petkov
2022-10-25 8:30 ` Borislav Petkov
2022-06-20 23:04 ` [PATCH Part2 v6 13/49] crypto:ccp: Provide APIs to issue SEV-SNP commands Ashish Kalra
2022-06-21 21:43 ` Peter Gonda
2022-06-22 1:44 ` Kalra, Ashish
2022-08-02 10:52 ` Jarkko Sakkinen
2022-10-01 20:17 ` Borislav Petkov
2022-10-03 14:38 ` Kalra, Ashish
2022-10-03 16:16 ` Borislav Petkov
2022-10-03 17:11 ` Kalra, Ashish
2022-10-03 17:45 ` Borislav Petkov
2022-10-03 18:01 ` Peter Gonda
2022-10-03 18:16 ` Borislav Petkov
2022-10-03 18:43 ` Kalra, Ashish
2022-10-03 18:53 ` Borislav Petkov
2022-06-20 23:05 ` [PATCH Part2 v6 14/49] crypto: ccp: Handle the legacy TMR allocation when SNP is enabled Ashish Kalra
2022-06-21 18:11 ` Peter Gonda
2022-06-21 20:17 ` Kalra, Ashish
2022-06-24 14:19 ` Peter Gonda
2022-08-02 12:17 ` jarkko
2022-08-02 11:17 ` Jarkko Sakkinen
2022-10-13 15:15 ` Borislav Petkov
2022-10-14 20:00 ` Kalra, Ashish
2022-10-25 10:25 ` Borislav Petkov
2022-10-31 20:10 ` Kalra, Ashish
2022-10-31 21:15 ` Borislav Petkov
2022-10-31 21:58 ` Kalra, Ashish
2022-11-02 11:22 ` Borislav Petkov
2022-11-14 23:36 ` Kalra, Ashish
2022-11-15 14:26 ` Borislav Petkov
2022-11-15 15:14 ` Vlastimil Babka
2022-11-15 15:22 ` Borislav Petkov
2022-11-15 16:27 ` Borislav Petkov
2022-11-15 22:44 ` Kalra, Ashish
2022-11-15 17:24 ` Kalra, Ashish
2022-11-15 18:15 ` Kalra, Ashish
2022-11-16 9:08 ` Vlastimil Babka
2022-11-16 10:19 ` Kalra, Ashish
2022-11-16 10:25 ` Vlastimil Babka
2022-11-16 18:01 ` Kalra, Ashish
2022-11-16 18:33 ` Borislav Petkov
2022-11-16 18:53 ` Kalra, Ashish
2022-11-16 19:09 ` Borislav Petkov
2022-11-16 19:23 ` Kalra, Ashish
2022-11-16 18:32 ` Dave Hansen
2022-11-16 5:19 ` HORIGUCHI NAOYA(堀口 直也)
2022-11-16 10:28 ` Kalra, Ashish
2022-11-16 23:41 ` HORIGUCHI NAOYA(堀口 直也)
2022-11-17 20:56 ` Kalra, Ashish
2022-11-20 21:34 ` Borislav Petkov
2022-11-22 0:37 ` Kalra, Ashish
2022-11-22 10:17 ` Borislav Petkov
2022-11-22 10:32 ` Kalra, Ashish
2022-11-22 10:44 ` Borislav Petkov
2022-11-22 11:44 ` Kalra, Ashish
2022-11-23 11:40 ` Borislav Petkov
2022-11-23 18:32 ` Kalra, Ashish
2022-06-20 23:05 ` [PATCH Part2 v6 15/49] crypto: ccp: Handle the legacy SEV command " Ashish Kalra
2022-06-20 23:05 ` [PATCH Part2 v6 16/49] crypto: ccp: Add the SNP_PLATFORM_STATUS command Ashish Kalra
2022-06-20 23:05 ` [PATCH Part2 v6 17/49] crypto: ccp: Add the SNP_{SET,GET}_EXT_CONFIG command Ashish Kalra
2022-06-21 22:13 ` Peter Gonda
2022-06-22 1:58 ` Kalra, Ashish
2022-08-02 12:31 ` Jarkko Sakkinen
2022-08-08 19:27 ` Dionna Amalie Glaze
2022-08-08 21:32 ` Tom Lendacky
2022-08-08 23:25 ` Dionna Amalie Glaze
2022-06-20 23:06 ` [PATCH Part2 v6 18/49] crypto: ccp: Provide APIs to query extended attestation report Ashish Kalra
2022-06-21 22:30 ` Peter Gonda
2022-08-02 12:39 ` Jarkko Sakkinen
2022-06-20 23:06 ` [PATCH Part2 v6 19/49] KVM: SVM: Add support to handle AP reset MSR protocol Ashish Kalra
2022-06-20 23:06 ` [PATCH Part2 v6 20/49] KVM: SVM: Provide the Hypervisor Feature support VMGEXIT Ashish Kalra
2022-06-20 23:06 ` [PATCH Part2 v6 21/49] KVM: SVM: Make AVIC backing, VMSA and VMCB memory allocation SNP safe Ashish Kalra
2022-08-04 11:32 ` Vlastimil Babka
2022-06-20 23:07 ` [PATCH Part2 v6 22/49] KVM: SVM: Add initial SEV-SNP support Ashish Kalra
2022-06-20 23:07 ` [PATCH Part2 v6 23/49] KVM: SVM: Add KVM_SNP_INIT command Ashish Kalra
2022-06-20 23:07 ` [PATCH Part2 v6 24/49] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_START command Ashish Kalra
2022-06-24 14:42 ` Peter Gonda
2022-06-24 18:17 ` Kalra, Ashish
2022-08-02 13:19 ` Jarkko Sakkinen
2022-06-20 23:07 ` [PATCH Part2 v6 25/49] KVM: SVM: Disallow registering memory range from HugeTLB for SNP guest Ashish Kalra
2022-08-04 13:37 ` Vlastimil Babka
2022-06-20 23:08 ` [PATCH Part2 v6 26/49] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_UPDATE command Ashish Kalra
2022-06-24 14:33 ` Peter Gonda
2022-06-29 18:14 ` Kalra, Ashish
2022-08-02 12:50 ` Jarkko Sakkinen
2022-08-09 13:55 ` Sabin Rapan
2022-08-15 23:04 ` Kalra, Ashish
2022-06-20 23:08 ` [PATCH Part2 v6 27/49] KVM: SVM: Mark the private vma unmerable for SEV-SNP guests Ashish Kalra
2022-06-22 10:29 ` Dr. David Alan Gilbert
2022-08-04 10:56 ` Vlastimil Babka
2022-06-20 23:08 ` [PATCH Part2 v6 28/49] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_FINISH command Ashish Kalra
2022-07-11 14:05 ` Peter Gonda
2022-07-11 22:41 ` Kalra, Ashish
2022-07-12 14:45 ` Peter Gonda
2022-07-12 15:22 ` Kalra, Ashish
2022-07-12 16:04 ` Peter Gonda
2022-07-12 17:40 ` Tom Lendacky
2022-07-13 14:59 ` Peter Gonda
2022-08-02 13:28 ` Jarkko Sakkinen
2022-09-08 14:55 ` [[PATCH for v6]] KVM: SEV: fix snp_launch_finish Harald Hoyer
2022-09-08 15:11 ` Sean Christopherson
2022-09-08 20:34 ` Jarkko Sakkinen
2022-09-09 8:04 ` [PATCH Part2 v6 28/49] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_FINISH command Harald Hoyer
2022-06-20 23:08 ` [PATCH Part2 v6 29/49] KVM: X86: Keep the NPT and RMP page level in sync Ashish Kalra
2022-07-12 16:44 ` Jarkko Sakkinen
2022-06-20 23:09 ` [PATCH Part2 v6 30/49] KVM: x86/mmu: Introduce kvm_mmu_map_tdp_page() for use by TDX and SNP Ashish Kalra
2022-06-20 23:09 ` [PATCH Part2 v6 31/49] KVM: x86: Introduce kvm_mmu_get_tdp_walk() for SEV-SNP use Ashish Kalra
2022-09-07 17:45 ` Alper Gun
2022-06-20 23:09 ` [PATCH Part2 v6 32/49] KVM: x86: Define RMP page fault error bits for #NPF Ashish Kalra
2022-06-20 23:10 ` [PATCH Part2 v6 33/49] KVM: x86: Update page-fault trace to log full 64-bit error code Ashish Kalra
2022-07-25 11:19 ` Vlastimil Babka
2022-06-20 23:10 ` [PATCH Part2 v6 34/49] KVM: SVM: Do not use long-lived GHCB map while setting scratch area Ashish Kalra
2022-06-20 23:10 ` [PATCH Part2 v6 35/49] KVM: SVM: Remove the long-lived GHCB host map Ashish Kalra
2022-06-24 15:12 ` Peter Gonda
2022-06-24 20:14 ` Kalra, Ashish
2022-07-07 20:06 ` Peter Gonda
2022-07-07 20:31 ` Kalra, Ashish
2022-07-08 15:54 ` Peter Gonda
2022-07-08 15:59 ` Kalra, Ashish
2022-06-20 23:11 ` [PATCH Part2 v6 36/49] KVM: SVM: Add support to handle GHCB GPA register VMGEXIT Ashish Kalra
2022-06-28 13:28 ` Dr. David Alan Gilbert
2022-06-20 23:11 ` [PATCH Part2 v6 37/49] KVM: SVM: Add support to handle MSR based Page State Change VMGEXIT Ashish Kalra
2022-08-19 16:54 ` Peter Gonda
2022-09-19 17:53 ` Alper Gun
2022-09-19 21:38 ` Tom Lendacky
2022-09-19 22:02 ` Alper Gun
2022-09-19 22:18 ` Tom Lendacky
2022-09-19 23:46 ` Ashish Kalra
2022-09-26 15:19 ` Peter Gonda
2022-10-12 20:15 ` Kalra, Ashish
2022-10-12 22:57 ` Michael Roth
2022-06-20 23:11 ` [PATCH Part2 v6 38/49] KVM: SVM: Add support to handle " Ashish Kalra
2022-06-20 23:12 ` [PATCH Part2 v6 39/49] KVM: SVM: Introduce ops for the post gfn map and unmap Ashish Kalra
2022-08-18 3:47 ` Alper Gun
2022-11-17 20:18 ` Peter Gonda
2022-11-17 20:28 ` Kalra, Ashish
2022-11-17 21:36 ` Kalra, Ashish
2022-06-20 23:12 ` [PATCH Part2 v6 40/49] KVM: x86: Export the kvm_zap_gfn_range() for the SNP use Ashish Kalra
2022-06-20 23:13 ` [PATCH Part2 v6 41/49] KVM: SVM: Add support to handle the RMP nested page fault Ashish Kalra
2022-07-12 12:33 ` Jarkko Sakkinen
2022-07-12 12:45 ` Jarkko Sakkinen
2022-07-12 12:48 ` Jarkko Sakkinen
2022-07-12 15:32 ` Kalra, Ashish
2022-10-10 22:03 ` Alper Gun
2022-10-11 2:32 ` Kalra, Ashish
2022-10-12 22:53 ` Alper Gun
2022-10-13 15:00 ` Kalra, Ashish
2022-06-20 23:13 ` [PATCH Part2 v6 42/49] KVM: SVM: Provide support for SNP_GUEST_REQUEST NAE event Ashish Kalra
2022-06-24 16:25 ` Peter Gonda
2022-06-27 19:03 ` Kalra, Ashish
2022-06-29 19:15 ` Kalra, Ashish
2022-07-08 15:28 ` Peter Gonda
2022-10-21 19:06 ` Tom Lendacky
2022-10-21 21:12 ` Kalra, Ashish
2022-10-21 21:30 ` Tom Lendacky
2022-10-21 21:56 ` Kalra, Ashish
2022-06-20 23:13 ` [PATCH Part2 v6 43/49] KVM: SVM: Use a VMSA physical address variable for populating VMCB Ashish Kalra
2022-06-20 23:14 ` [PATCH Part2 v6 44/49] KVM: SVM: Support SEV-SNP AP Creation NAE event Ashish Kalra
2022-06-20 23:14 ` [PATCH Part2 v6 45/49] KVM: SVM: Add module parameter to enable the SEV-SNP Ashish Kalra
2022-06-20 23:14 ` [PATCH Part2 v6 46/49] ccp: add support to decrypt the page Ashish Kalra
2022-06-20 23:14 ` [PATCH Part2 v6 47/49] *fix for stale per-cpu pointer due to cond_resched during ghcb mapping Ashish Kalra
2022-06-24 16:35 ` Peter Gonda
2022-06-24 16:44 ` Kalra, Ashish
2022-06-20 23:15 ` [PATCH Part2 v6 48/49] *debug: warn and retry failed rmpupdates Ashish Kalra
2022-06-20 23:15 ` [PATCH Part2 v6 49/49] KVM: SVM: Sync the GHCB scratch buffer using already mapped ghcb Ashish Kalra
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