kernel/linux.git/include/hyperv/hvgdk_mini.h, branch linux-7.0.yLinux kernel stable tree (mirror)https://git.radix-linux.su/kernel/linux.git/atom?h=linux-7.0.y2026-04-04T05:25:53+00:00mshv: Fix infinite fault loop on permission-denied GPA intercepts2026-04-04T05:25:53+00:00Stanislav Kinsburskiiskinsburskii@linux.microsoft.com2026-03-24T23:57:40+00:00urn:sha1:16cbec24897624051b324aa3a85859c38ca65fde
Prevent infinite fault loops when guests access memory regions without
proper permissions. Currently, mshv_handle_gpa_intercept() attempts to
remap pages for all faults on movable memory regions, regardless of
whether the access type is permitted. When a guest writes to a read-only
region, the remap succeeds but the region remains read-only, causing
immediate re-fault and spinning the vCPU indefinitely.
Validate intercept access type against region permissions before
attempting remaps. Reject writes to non-writable regions and executes to
non-executable regions early, returning false to let the VMM handle the
intercept appropriately.
This also closes a potential DoS vector where malicious guests could
intentionally trigger these fault loops to consume host resources.
Fixes: b9a66cd5ccbb ("mshv: Add support for movable memory regions")
Signed-off-by: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Reviewed-by: Anirudh Rayabharam (Microsoft) <anirudh@anirudhrb.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Revert "mshv: expose the scrub partition hypercall"2026-03-11T16:54:24+00:00Wei Liuwei.liu@kernel.org2026-03-11T16:51:00+00:00urn:sha1:edd20cb693d9cb5e3d6fcecd858093dab4e2b0aa
This reverts commit 36d6cbb62133fc6eea28f380409e0fb190f3dfbe.
Calling this as a passthrough hypercall leaves the VM in an inconsistent
state. Revert before it is released.
Signed-off-by: Wei Liu <wei.liu@kernel.org>
mshv: add arm64 support for doorbell & intercept SINTs2026-02-25T19:09:49+00:00Anirudh Rayabharam (Microsoft)anirudh@anirudhrb.com2026-02-25T12:44:03+00:00urn:sha1:622d68772ddf07573cf88e833afe8ba6c70ac748
On x86, the HYPERVISOR_CALLBACK_VECTOR is used to receive synthetic
interrupts (SINTs) from the hypervisor for doorbells and intercepts.
There is no such vector reserved for arm64.
On arm64, the hypervisor exposes a synthetic register that can be read
to find the INTID that should be used for SINTs. This INTID is in the
PPI range.
To better unify the code paths, introduce mshv_sint_vector_init() that
either reads the synthetic register and obtains the INTID (arm64) or
just uses HYPERVISOR_CALLBACK_VECTOR as the interrupt vector (x86).
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Reviewed-by: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Signed-off-by: Anirudh Rayabharam (Microsoft) <anirudh@anirudhrb.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
mshv: Handle insufficient root memory hypervisor statuses2026-02-19T06:42:11+00:00Stanislav Kinsburskiiskinsburskii@linux.microsoft.com2026-02-05T18:42:27+00:00urn:sha1:158ebb578cd5f7881fdc7c4ecebddcf9463f91fd
When creating guest partition objects, the hypervisor may fail to
allocate root partition pages and return an insufficient memory status.
In this case, deposit memory using the root partition ID instead.
Signed-off-by: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Reviewed-by: Anirudh Rayabharam (Microsoft) <anirudh@anirudhrb.com>
Reviewed-by: Mukesh R <mrathor@linux.microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
mshv: Handle insufficient contiguous memory hypervisor status2026-02-19T06:39:16+00:00Stanislav Kinsburskiiskinsburskii@linux.microsoft.com2026-02-05T18:42:21+00:00urn:sha1:cf82dd5ea95815e6c0612b61118d2358ef5c05b0
The HV_STATUS_INSUFFICIENT_CONTIGUOUS_MEMORY status indicates that the
hypervisor lacks sufficient contiguous memory for its internal allocations.
When this status is encountered, allocate and deposit
HV_MAX_CONTIGUOUS_ALLOCATION_PAGES contiguous pages to the hypervisor.
HV_MAX_CONTIGUOUS_ALLOCATION_PAGES is defined in the hypervisor headers, a
deposit of this size will always satisfy the hypervisor's requirements.
Signed-off-by: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Reviewed-by: Anirudh Rayabharam (Microsoft) <anirudh@anirudhrb.com>
Reviewed-by: Mukesh R <mrathor@linux.microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
mshv: expose the scrub partition hypercall2026-02-18T23:32:17+00:00Magnus Kulkemagnuskulke@linux.microsoft.com2026-02-18T23:32:17+00:00urn:sha1:36d6cbb62133fc6eea28f380409e0fb190f3dfbe
This hypercall needs to be exposed for VMMs to soft-reboot guests. It
will reset APIC and synthetic interrupt controller state, among others.
Signed-off-by: Magnus Kulke <magnuskulke@linux.microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
hyperv: Avoid -Wflex-array-member-not-at-end warning2025-12-18T19:42:01+00:00Gustavo A. R. Silvagustavoars@kernel.org2025-12-12T06:44:50+00:00urn:sha1:52f758edc9f9f0b1f4f83eb668a5f76482ce00ca
-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.
Use the new __TRAILING_OVERLAP() helper to fix the following warning:
include/hyperv/hvgdk_mini.h:581:25: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
This helper creates a union between a flexible-array member (FAM) and a
set of MEMBERS that would otherwise follow it.
This overlays the trailing MEMBER u64 gva_list[]; onto the FAM
struct hv_tlb_flush_ex::hv_vp_set.bank_contents[], while keeping
the FAM and the start of MEMBER aligned.
The static_assert() ensures this alignment remains, and it's
intentionally placed inmediately after the related structure --no
blank line in between.
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
mshv: Add definitions for MSHV sleep state configuration2025-12-05T23:24:57+00:00Praveen K Paladuguprapal@linux.microsoft.com2025-12-05T20:17:06+00:00urn:sha1:723c47a221ee407901055c9d9b4434e68c5d650e
Add the definitions required to configure sleep states in mshv hypervsior.
Signed-off-by: Praveen K Paladugu <prapal@linux.microsoft.com>
Co-developed-by: Anatol Belski <anbelski@linux.microsoft.com>
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
Reviewed-by: Easwar Hariharan <easwar.hariharan@linux.microsoft.com>
Reviewed-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>
Acked-by: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Drivers: hv: Introduce mshv_vtl driver2025-12-05T23:16:26+00:00Naman Jainnamjain@linux.microsoft.com2025-11-13T04:41:49+00:00urn:sha1:7bfe3b8ea6e30437e01fcb8e4f56ef6e4d986d0f
Provide an interface for Virtual Machine Monitor like OpenVMM and its
use as OpenHCL paravisor to control VTL0 (Virtual trust Level).
Expose devices and support IOCTLs for features like VTL creation,
VTL0 memory management, context switch, making hypercalls,
mapping VTL0 address space to VTL2 userspace, getting new VMBus
messages and channel events in VTL2 etc.
Co-developed-by: Roman Kisel <romank@linux.microsoft.com>
Signed-off-by: Roman Kisel <romank@linux.microsoft.com>
Co-developed-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Naman Jain <namjain@linux.microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
hyperv: Add two new hypercall numbers to guest ABI public header2025-11-15T06:18:16+00:00Mukesh Rathormrathor@linux.microsoft.com2025-10-06T22:42:04+00:00urn:sha1:56c3feb3cc17b764f51191fd3dc461ab55a7b803
In preparation for the subsequent crashdump patches, copy two hypercall
numbers to the guest ABI header published by Hyper-V. One to notify
hypervisor of an event that occurs in the root partition, other to ask
hypervisor to disable the hypervisor.
Signed-off-by: Mukesh Rathor <mrathor@linux.microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>