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2024-08-30drivers/virt: pkvm: Intercept ioremap using pKVM MMIO_GUARD hypercallWill Deacon1-0/+26
Hook up pKVM's MMIO_GUARD hypercall so that ioremap() and friends will register the target physical address as MMIO with the hypervisor, allowing guest exits to that page to be emulated by the host with full syndrome information. Acked-by: Marc Zyngier <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Will Deacon <[email protected]>
2024-08-30drivers/virt: pkvm: Hook up mem_encrypt API using pKVM hypercallsWill Deacon1-0/+50
If we detect the presence of pKVM's SHARE and UNSHARE hypercalls, then register a backend implementation of the mem_encrypt API so that things like DMA buffers can be shared appropriately with the host. Acked-by: Marc Zyngier <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Will Deacon <[email protected]>
2024-08-30drivers/virt: pkvm: Add initial support for running as a protected guestWill Deacon1-0/+22
Implement a pKVM protected guest driver to probe the presence of pKVM and determine the memory protection granule using the HYP_MEMINFO hypercall. Acked-by: Marc Zyngier <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Will Deacon <[email protected]>
2024-05-01KVM: arm64: Document the KVM/arm64-specific calls in hypercalls.rstWill Deacon2-0/+47
KVM/arm64 makes use of the SMCCC "Vendor Specific Hypervisor Service Call Range" to expose KVM-specific hypercalls to guests in a discoverable and extensible fashion. Document the existence of this interface and the discovery hypercall. Signed-off-by: Will Deacon <[email protected]> Signed-off-by: Fuad Tabba <[email protected]> Acked-by: Oliver Upton <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Marc Zyngier <[email protected]>
2024-05-01KVM: arm64: Rename firmware pseudo-register documentation fileWill Deacon2-4/+4
In preparation for describing the guest view of KVM/arm64 hypercalls in hypercalls.rst, move the existing contents of the file concerning the firmware pseudo-registers elsewhere. Cc: Raghavendra Rao Ananta <[email protected]> Signed-off-by: Will Deacon <[email protected]> Signed-off-by: Fuad Tabba <[email protected]> Acked-by: Oliver Upton <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Marc Zyngier <[email protected]>
2024-05-01KVM: arm64: Reformat/beautify PTP hypercall documentationWill Deacon1-14/+24
The PTP hypercall documentation doesn't produce the best-looking table when formatting in HTML as all of the return value definitions end up on the same line. Reformat the PTP hypercall documentation to follow the formatting used by hypercalls.rst. Signed-off-by: Will Deacon <[email protected]> Signed-off-by: Fuad Tabba <[email protected]> Acked-by: Oliver Upton <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Marc Zyngier <[email protected]>
2023-10-04KVM: arm64: Document vCPU feature selection UAPIsOliver Upton2-0/+49
KVM/arm64 has a couple schemes for handling vCPU feature selection now, which is a lot to put on userspace. Add some documentation about how these interact and provide some recommendations for how to use the writable ID register scheme. Reviewed-by: Marc Zyngier <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Oliver Upton <[email protected]>
2022-11-11KVM: arm64: Fix pvtime documentationUsama Arif1-6/+8
This includes table format and using reST labels for cross-referencing to vcpu.rst. Suggested-by: Bagas Sanjaya <[email protected]> Signed-off-by: Usama Arif <[email protected]> Reviewed-by: Steven Price <[email protected]> Signed-off-by: Marc Zyngier <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2022-07-01arm64: Rename the VHE switch to "finalise_el2"Marc Zyngier1-5/+6
as we are about to perform a lot more in 'mutate_to_vhe' than we currently do, this function really becomes the point where we finalise the basic EL2 configuration. Reflect this into the code by renaming a bunch of things: - HVC_VHE_RESTART -> HVC_FINALISE_EL2 - switch_to_vhe --> finalise_el2 - mutate_to_vhe -> __finalise_el2 No functional changes. Signed-off-by: Marc Zyngier <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Will Deacon <[email protected]>
2022-05-04Documentation: Fix index.rst after psci.rst renamingMarc Zyngier1-1/+1
Fix the TOC in index.rst after psci.rst has been renamed to hypercalls.rst. Signed-off-by: Marc Zyngier <[email protected]> Reported-by: Stephen Rothwell <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2022-05-03Docs: KVM: Add doc for the bitmap firmware registersRaghavendra Rao Ananta1-17/+78
Add the documentation for the bitmap firmware registers in hypercalls.rst and api.rst. This includes the details for KVM_REG_ARM_STD_BMAP, KVM_REG_ARM_STD_HYP_BMAP, and KVM_REG_ARM_VENDOR_HYP_BMAP registers. Since the document is growing to carry other hypercall related information, make necessary adjustments to present the document in a generic sense, rather than being PSCI focused. Signed-off-by: Raghavendra Rao Ananta <[email protected]> Reviewed-by: Gavin Shan <[email protected]> [maz: small scale reformat, move things about, random typo fixes] Signed-off-by: Marc Zyngier <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2022-05-03Docs: KVM: Rename psci.rst to hypercalls.rstRaghavendra Rao Ananta1-0/+0
Since the doc also covers general hypercalls' details, rather than just PSCI, and the fact that the bitmap firmware registers' details will be added to this doc, rename the file to a more appropriate name- hypercalls.rst. Signed-off-by: Raghavendra Rao Ananta <[email protected]> Reviewed-by: Gavin Shan <[email protected]> Reviewed-by: Oliver Upton <[email protected]> Signed-off-by: Marc Zyngier <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-04-20KVM: arm64: Fix Function ID typo for PTP_KVM serviceZenghui Yu1-2/+2
Per include/linux/arm-smccc.h, the Function ID of PTP_KVM service is defined as ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID. Fix the typo in documentation to keep the git grep consistent. Signed-off-by: Zenghui Yu <[email protected]> Signed-off-by: Marc Zyngier <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-04-08KVM: arm64: Fix table format for PTP documentationMarc Zyngier1-11/+11
The documentation build legitimately screams about the PTP documentation table being misformated. Fix it by adjusting the table width guides. Reported-by: Stephen Rothwell <[email protected]> Signed-off-by: Marc Zyngier <[email protected]>
2021-04-07KVM: arm64: Add support for the KVM PTP serviceJianyong Wu2-0/+26
Implement the hypervisor side of the KVM PTP interface. The service offers wall time and cycle count from host to guest. The caller must specify whether they want the host's view of either the virtual or physical counter. Signed-off-by: Jianyong Wu <[email protected]> Signed-off-by: Marc Zyngier <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2021-02-09KVM: arm64: Document HVC_VHE_RESTART stub hypercallMarc Zyngier1-0/+9
For completeness, let's document the HVC_VHE_RESTART stub. Signed-off-by: Marc Zyngier <[email protected]> Acked-by: David Brazdil <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Will Deacon <[email protected]>
2020-12-03KVM: arm64: Some fixes of PV-time interface documentKeqian Zhu1-2/+2
Rename PV_FEATURES to PV_TIME_FEATURES. Signed-off-by: Keqian Zhu <[email protected]> Signed-off-by: Marc Zyngier <[email protected]> Reviewed-by: Andrew Jones <[email protected]> Reviewed-by: Steven Price <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2020-09-11Documentation/kvm/arm: improve description of HVC_SOFT_RESTARTPingfan Liu1-3/+3
Besides disabling MMU, HVC_SOFT_RESTART also clears I+D bits. These behaviors are what kexec-reboot expects, so describe it more precisely. Signed-off-by: Pingfan Liu <[email protected]> Cc: James Morse <[email protected]> Cc: Marc Zyngier <[email protected]> Cc: Geoff Levand <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Will Deacon <[email protected]> Cc: Julien Thierry <[email protected]> Cc: Suzuki K Poulose <[email protected]> Cc: [email protected] Cc: [email protected] Link: https://lore.kernel.org/r/[email protected] To: [email protected] Signed-off-by: Will Deacon <[email protected]>
2020-04-20docs: fix broken references to text filesMauro Carvalho Chehab1-1/+1
Several references got broken due to txt to ReST conversion. Several of them can be automatically fixed with: scripts/documentation-file-ref-check --fix Reviewed-by: Mathieu Poirier <[email protected]> # hwtracing/coresight/Kconfig Reviewed-by: Paul E. McKenney <[email protected]> # memory-barrier.txt Acked-by: Alex Shi <[email protected]> # translations/zh_CN Acked-by: Federico Vaga <[email protected]> # translations/it_IT Acked-by: Marc Zyngier <[email protected]> # kvm/arm64 Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/6f919ddb83a33b5f2a63b6b5f0575737bb2b36aa.1586881715.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet <[email protected]>
2020-03-24arm: Remove 32bit KVM host supportMarc Zyngier1-0/+5
That's it. Remove all references to KVM itself, and document that although it is no more, the ABI between SVC and HYP still exists. Signed-off-by: Marc Zyngier <[email protected]> Acked-by: Olof Johansson <[email protected]> Acked-by: Arnd Bergmann <[email protected]> Acked-by: Will Deacon <[email protected]> Acked-by: Vladimir Murzin <[email protected]> Acked-by: Catalin Marinas <[email protected]> Acked-by: Linus Walleij <[email protected]> Acked-by: Christoffer Dall <[email protected]>
2020-02-12docs: kvm: arm/psci.txt: convert to ReSTMauro Carvalho Chehab2-15/+32
- Add a title for the document; - Adjust whitespaces for it to be properly formatted after parsed. Signed-off-by: Mauro Carvalho Chehab <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
2020-02-12docs: kvm: convert arm/hyp-abi.txt to ReSTMauro Carvalho Chehab2-9/+20
- Add proper markups for titles; - Adjust whitespaces and blank lines to match ReST needs; - Mark literal blocks as such. Signed-off-by: Mauro Carvalho Chehab <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
2020-02-12docs: kvm: add arm/pvtime.rst to index.rstMauro Carvalho Chehab1-0/+10
Add this file to a new kvm/arm index.rst, in order for it to be shown as part of the virt book. Signed-off-by: Mauro Carvalho Chehab <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
2019-10-21KVM: arm64: Document PV-time interfaceSteven Price1-0/+80
Introduce a paravirtualization interface for KVM/arm64 based on the "Arm Paravirtualized Time for Arm-Base Systems" specification DEN 0057A. This only adds the details about "Stolen Time" as the details of "Live Physical Time" have not been fully agreed. User space can specify a reserved area of memory for the guest and inform KVM to populate the memory with information on time that the host kernel has stolen from the guest. A hypercall interface is provided for the guest to interrogate the hypervisor's support for this interface and the location of the shared memory structures. Signed-off-by: Steven Price <[email protected]> Signed-off-by: Marc Zyngier <[email protected]>
2019-07-24Documentation: move Documentation/virtual to Documentation/virtChristoph Hellwig2-0/+114
Renaming docs seems to be en vogue at the moment, so fix on of the grossly misnamed directories. We usually never use "virtual" as a shortcut for virtualization in the kernel, but always virt, as seen in the virt/ top-level directory. Fix up the documentation to match that. Fixes: ed16648eb5b8 ("Move kvm, uml, and lguest subdirectories under a common "virtual" directory, I.E:") Signed-off-by: Christoph Hellwig <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
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