linux-toradex.git/tools/testing/selftests/kvm/include, branch master

KVM: selftests: Verify SEV+ guests can read and write EFER, CR0, CR4, and CR8

2026-03-12T16:31:53+00:00

Add "do no harm" testing of EFER, CR0, CR4, and CR8 for SEV+ guests to
verify that the guest can read and write the registers, without hitting
e.g. a #VC on SEV-ES guests due to KVM incorrectly trying to intercept a
register.

Signed-off-by: Sean Christopherson 
Message-ID: <20260310211841.2552361-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini

selftests: kvm: extract common functionality out of smm_test.c

2026-03-11T17:41:12+00:00

Signed-off-by: Paolo Bonzini

Merge tag 'kvm-x86-apic-6.20' of https://github.com/kvm-x86/linux into HEAD

2026-02-11T17:45:32+00:00

KVM x86 APIC-ish changes for 6.20

 - Fix a benign bug where KVM could use the wrong memslots (ignored SMM) when
   creating a vCPU-specific mapping of guest memory.

 - Clean up KVM's handling of marking mapped vCPU pages dirty.

 - Drop a pile of *ancient* sanity checks hidden behind in KVM's unused
   ASSERT() macro, most of which could be trivially triggered by the guest
   and/or user, and all of which were useless.

 - Fold "struct dest_map" into its sole user, "struct rtc_status", to make it
   more obvious what the weird parameter is used for, and to allow burying the
   RTC shenanigans behind CONFIG_KVM_IOAPIC=y.

 - Bury all of ioapic.h and KVM_IRQCHIP_KERNEL behind CONFIG_KVM_IOAPIC=y.

 - Add a regression test for recent APICv update fixes.

 - Rework KVM's handling of VMCS updates while L2 is active to temporarily
   switch to vmcs01 instead of deferring the update until the next nested
   VM-Exit.  The deferred updates approach directly contributed to several
   bugs, was proving to be a maintenance burden due to the difficulty in
   auditing the correctness of deferred updates, and was polluting
   "struct nested_vmx" with a growing pile of booleans.

 - Handle "hardware APIC ISR", a.k.a. SVI, updates in kvm_apic_update_apicv()
   to consolidate the updates, and to co-locate SVI updates with the updates
   for KVM's own cache of ISR information.

 - Drop a dead function declaration.

Merge tag 'kvm-riscv-6.20-1' of https://github.com/kvm-riscv/linux into HEAD

2026-02-11T17:45:00+00:00

KVM/riscv changes for 6.20

- Fixes for issues discoverd by KVM API fuzzing in
  kvm_riscv_aia_imsic_has_attr(), kvm_riscv_aia_imsic_rw_attr(),
  and kvm_riscv_vcpu_aia_imsic_update()
- Allow Zalasr, Zilsd and Zclsd extensions for Guest/VM
- Add riscv vm satp modes in KVM selftests
- Transparent huge page support for G-stage
- Adjust the number of available guest irq files based on
  MMIO register sizes in DeviceTree or ACPI

Merge tag 'kvm-x86-svm-6.20' of https://github.com/kvm-x86/linux into HEAD

2026-02-09T17:51:37+00:00

KVM SVM changes for 6.20

 - Drop a user-triggerable WARN on nested_svm_load_cr3() failure.

 - Add support for virtualizing ERAPS.  Note, correct virtualization of ERAPS
   relies on an upcoming, publicly announced change in the APM to reduce the
   set of conditions where hardware (i.e. KVM) *must* flush the RAP.

 - Ignore nSVM intercepts for instructions that are not supported according to
   L1's virtual CPU model.

 - Add support for expedited writes to the fast MMIO bus, a la VMX's fastpath
   for EPT Misconfig.

 - Don't set GIF when clearing EFER.SVME, as GIF exists independently of SVM,
   and allow userspace to restore nested state with GIF=0.

 - Treat exit_code as an unsigned 64-bit value through all of KVM.

 - Add support for fetching SNP certificates from userspace.

 - Fix a bug where KVM would use vmcb02 instead of vmcb01 when emulating VMLOAD
   or VMSAVE on behalf of L2.

 - Misc fixes and cleanups.

Merge tag 'kvm-x86-selftests-6.20' of https://github.com/kvm-x86/linux into HEAD

2026-02-09T17:38:54+00:00

KVM selftests changes for 6.20

 - Add a regression test for TPR<=>CR8 synchronization and IRQ masking.

 - Overhaul selftest's MMU infrastructure to genericize stage-2 MMU support,
   and extend x86's infrastructure to support EPT and NPT (for L2 guests).

 - Extend several nested VMX tests to also cover nested SVM.

 - Add a selftest for nested VMLOAD/VMSAVE.

 - Rework the nested dirty log test, originally added as a regression test for
   PML where KVM logged L2 GPAs instead of L1 GPAs, to improve test coverage
   and to hopefully make the test easier to understand and maintain.

KVM: riscv: selftests: Add riscv vm satp modes

2026-02-06T13:35:23+00:00

Current vm modes cannot represent riscv guest modes precisely, here add
all 9 combinations of P(56,40,41) x V(57,48,39). Also the default vm
mode is detected on runtime instead of hardcoded one, which might not be
supported on specific machine.

Signed-off-by: Wu Fei 
Reviewed-by: Andrew Jones 
Reviewed-by: Nutty Liu 
Reviewed-by: Anup Patel 
Link: https://lore.kernel.org/r/20251105151442.28767-1-wu.fei9@sanechips.com.cn
Signed-off-by: Anup Patel

KVM: selftests: Test READ=>WRITE dirty logging behavior for shadow MMU

2026-01-16T15:48:54+00:00

Update the nested dirty log test to validate KVM's handling of READ faults
when dirty logging is enabled.  Specifically, set the Dirty bit in the
guest PTEs used to map L2 GPAs, so that KVM will create writable SPTEs
when handling L2 read faults.  When handling read faults in the shadow MMU,
KVM opportunistically creates a writable SPTE if the mapping can be
writable *and* the gPTE is dirty (or doesn't support the Dirty bit), i.e.
if KVM doesn't need to intercept writes in order to emulate Dirty-bit
updates.

To actually test the L2 READ=>WRITE sequence, e.g. without masking a false
pass by other test activity, route the READ=>WRITE and WRITE=>WRITE
sequences to separate L1 pages, and differentiate between "marked dirty
due to a WRITE access/fault" and "marked dirty due to creating a writable
SPTE for a READ access/fault".  The updated sequence exposes the bug fixed
by KVM commit 1f4e5fc83a42 ("KVM: x86: fix nested guest live migration
with PML") when the guest performs a READ=>WRITE sequence with dirty guest
PTEs.

Opportunistically tweak and rename the address macros, and add comments,
to make it more obvious what the test is doing.  E.g. NESTED_TEST_MEM1
vs. GUEST_TEST_MEM doesn't make it all that obvious that the test is
creating aliases in both the L2 GPA and GVA address spaces, but only when
L1 is using TDP to run L2.

Cc: Yosry Ahmed 
Reviewed-by: Yosry Ahmed 
Link: https://patch.msgid.link/20260115172154.709024-1-seanjc@google.com
Signed-off-by: Sean Christopherson

KVM: selftests: Fix typos and stale comments in kvm_util

2026-01-15T13:39:53+00:00

Fix minor documentation errors in `kvm_util.h` and `kvm_util.c`.

- Correct the argument description for `vcpu_args_set` in `kvm_util.h`,
  which incorrectly listed `vm` instead of `vcpu`.
- Fix a typo in the comment for `kvm_selftest_arch_init` ("exeucting" ->
  "executing").
- Correct the return value description for `vm_vaddr_unused_gap` in
  `kvm_util.c` to match the implementation, which returns an address "at
  or above" `vaddr_min`, not "at or below".

No functional change intended.

Reviewed-by: Andrew Jones 
Signed-off-by: Fuad Tabba 
Link: https://patch.msgid.link/20260109082218.3236580-6-tabba@google.com
Signed-off-by: Marc Zyngier

KVM: selftests: Move page_align() to shared header

2026-01-15T13:39:53+00:00

To avoid code duplication, move page_align() to the shared `kvm_util.h`
header file. Rename it to vm_page_align(), to make it clear that the
alignment is done with respect to the guest's base page size.

No functional change intended.

Reviewed-by: Andrew Jones 
Signed-off-by: Fuad Tabba 
Link: https://patch.msgid.link/20260109082218.3236580-5-tabba@google.com
Signed-off-by: Marc Zyngier