kernel.git/arch/powerpc/include/asm/firmware.h, branch linux-5.17.y

powerpc: Remove unused FW_FEATURE_NATIVE references

2021-12-02T11:57:22Z

FW_FEATURE_NATIVE_ALWAYS and FW_FEATURE_NATIVE_POSSIBLE are always zero and never do anything. Remove them. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20211201144153.2456614-2-npiggin@gmail.com

powerpc/pseries: Add support for FORM2 associativity

2021-08-13T12:04:27Z

PAPR interface currently supports two different ways of communicating resource grouping details to the OS. These are referred to as Form 0 and Form 1 associativity grouping. Form 0 is the older format and is now considered deprecated. This patch adds another resource grouping named FORM2. Signed-off-by: Daniel Henrique Barboza Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210812132223.225214-6-aneesh.kumar@linux.ibm.com

powerpc/pseries: Rename TYPE1_AFFINITY to FORM1_AFFINITY

2021-08-13T12:04:26Z

Also make related code cleanup that will allow adding FORM2_AFFINITY in later patches. No functional change in this patch. Signed-off-by: Aneesh Kumar K.V Reviewed-by: David Gibson Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210812132223.225214-3-aneesh.kumar@linux.ibm.com

powerpc: remove unneeded semicolons

2021-02-08T13:10:50Z

Remove superfluous semicolons after function definitions. Signed-off-by: Chengyang Fan Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210125095338.1719405-1-cy.fan@huawei.com

powerpc: Refactor is_kvm_guest() declaration to new header

2020-12-03T14:01:21Z

Only code/declaration movement, in anticipation of doing a KVM-aware vcpu_is_preempted(). No additional changes. Signed-off-by: Srikar Dronamraju Acked-by: Waiman Long Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20201202050456.164005-2-srikar@linux.vnet.ibm.com

powerpc/book3s64/radix: Add kernel command line option to disable radix GTSE

2020-07-29T11:09:37Z

This adds a kernel command line option that can be used to disable GTSE support. Disabling GTSE implies kernel will make hcalls to invalidate TLB entries. This was done so that we can do VM migration between configs that enable/disable GTSE support via hypervisor. To migrate a VM from a system that supports GTSE to a system that doesn't, we can boot the guest with radix_hcall_invalidate=on, thereby forcing the guest to use hcalls for TLB invalidates. The check for hcall availability is done in pSeries_setup_arch so that the panic message appears on the console. This should only happen on a hypervisor that doesn't force the guest to hash translation even though it can't handle the radix GTSE=0 request via CAS. With radix_hcall_invalidate=on if the hypervisor doesn't support hcall_rpt_invalidate hcall it should force the LPAR to hash translation. Signed-off-by: Aneesh Kumar K.V Tested-by: Bharata B Rao Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200727085908.420806-1-aneesh.kumar@linux.ibm.com

powerpc/pseries: Add KVM guest doorbell restrictions

2020-07-29T11:02:10Z

KVM guests have certain restrictions and performance quirks when using doorbells. This patch moves the EPAPR KVM guest test so it can be shared with PSERIES, and uses that in doorbell setup code to apply the KVM guest quirks and improves IPI performance for two cases: - PowerVM guests may now use doorbells even if they are secure. - KVM guests no longer use doorbells if XIVE is available. There is a valid complaint that "KVM guest" is not a very reasonable thing to test for, it's preferable for the hypervisor to advertise particular behaviours to the guest so they could change if the hypervisor implementation or configuration changes. However in this case we were already assuming a KVM guest worst case, so this patch is about containing those quirks. If KVM later advertises fast doorbells, we should test for that and override the quirks. Signed-off-by: Nicholas Piggin Tested-by: Cédric Le Goater Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200726035155.1424103-4-npiggin@gmail.com

powerpc/pseries/ras: Avoid calling rtas_token() in NMI paths

2020-05-18T11:58:45Z

In the interest of reducing code and possible failures in the machine check and system reset paths, grab the "ibm,nmi-interlock" token at init time. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Reviewed-by: Christophe Leroy Reviewed-by: Mahesh Salgaonkar Link: https://lore.kernel.org/r/20200508043408.886394-6-npiggin@gmail.com

powerpc/pseries/iommu: Separate FW_FEATURE_MULTITCE to put/stuff features

2020-01-06T05:25:30Z

H_PUT_TCE_INDIRECT allows packing up to 512 TCE updates into a single hypercall; H_STUFF_TCE can clear lots in a single hypercall too. However, unlike H_STUFF_TCE (which writes the same TCE to all entries), H_PUT_TCE_INDIRECT uses a 4K page with new TCEs. In a secure VM environment this means sharing a secure VM page with a hypervisor which we would rather avoid. This splits the FW_FEATURE_MULTITCE feature into FW_FEATURE_PUT_TCE_IND and FW_FEATURE_STUFF_TCE. "hcall-multi-tce" in the "/rtas/ibm,hypertas-functions" device tree property sets both; the "multitce=off" kernel command line parameter disables both. This should not cause behavioural change. Signed-off-by: Alexey Kardashevskiy Reviewed-by: Thiago Jung Bauermann Tested-by: Thiago Jung Bauermann Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20191216041924.42318-4-aik@ozlabs.ru

powerpc/powernv: Introduce FW_FEATURE_ULTRAVISOR

2019-08-29T23:40:15Z

In PEF enabled systems, some of the resources which were previously hypervisor privileged are now ultravisor privileged and controlled by the ultravisor firmware. This adds FW_FEATURE_ULTRAVISOR to indicate if PEF is enabled. The host kernel can use FW_FEATURE_ULTRAVISOR, for instance, to skip accessing resources (e.g. PTCR and LDBAR) in case PEF is enabled. Signed-off-by: Claudio Carvalho [ andmike: Device node name to "ibm,ultravisor" ] Signed-off-by: Michael Anderson Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20190822034838.27876-4-cclaudio@linux.ibm.com