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| author | Will Deacon <will@kernel.org> | 2022-02-21 16:35:24 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-02-21 17:02:55 +0100 |
| commit | 34739fd95fab3a5efb0422e4f012b685e33598dc (patch) | |
| tree | 49e5aba0a7670c819e5a00259cb20e0691b0601f /Documentation/virt | |
| parent | KVM: arm64: Expose PSCI SYSTEM_RESET2 call to the guest (diff) | |
| download | linux-34739fd95fab3a5efb0422e4f012b685e33598dc.tar.xz linux-34739fd95fab3a5efb0422e4f012b685e33598dc.zip | |
KVM: arm64: Indicate SYSTEM_RESET2 in kvm_run::system_event flags field
When handling reset and power-off PSCI calls from the guest, we
initialise X0 to PSCI_RET_INTERNAL_FAILURE in case the VMM tries to
re-run the vCPU after issuing the call.
Unfortunately, this also means that the VMM cannot see which PSCI call
was issued and therefore cannot distinguish between PSCI SYSTEM_RESET
and SYSTEM_RESET2 calls, which is necessary in order to determine the
validity of the "reset_type" in X1.
Allocate bit 0 of the previously unused 'flags' field of the
system_event structure so that we can indicate the PSCI call used to
initiate the reset.
Cc: Marc Zyngier <maz@kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Alexandru Elisei <alexandru.elisei@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220221153524.15397-4-will@kernel.org
Diffstat (limited to 'Documentation/virt')
| -rw-r--r-- | Documentation/virt/kvm/api.rst | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index a4267104db50..8305ac9747b6 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -5939,6 +5939,11 @@ Valid values for 'type' are: to ignore the request, or to gather VM memory core dump and/or reset/shutdown of the VM. +Valid flags are: + + - KVM_SYSTEM_EVENT_RESET_FLAG_PSCI_RESET2 (arm64 only) -- the guest issued + a SYSTEM_RESET2 call according to v1.1 of the PSCI specification. + :: /* KVM_EXIT_IOAPIC_EOI */ |