diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2020-07-27 11:59:08 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-07-29 14:09:37 +0300 |
| commit | bf6b7661f41615c0815fce0a3f27acb5fc005470 (patch) | |
| tree | 4054f048ea5e51306efb8e0d2e6c50e8f564b92c /arch/powerpc/include/asm/firmware.h | |
| parent | a5a8b258da7861009240b57687dfef47af91b406 (diff) | |
| download | linux-bf6b7661f41615c0815fce0a3f27acb5fc005470.tar.xz | |
powerpc/book3s64/radix: Add kernel command line option to disable radix GTSE
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 <aneesh.kumar@linux.ibm.com>
Tested-by: Bharata B Rao <bharata@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200727085908.420806-1-aneesh.kumar@linux.ibm.com
Diffstat (limited to 'arch/powerpc/include/asm/firmware.h')
| -rw-r--r-- | arch/powerpc/include/asm/firmware.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/firmware.h b/arch/powerpc/include/asm/firmware.h index f67efbaba17f..0b295bdb201e 100644 --- a/arch/powerpc/include/asm/firmware.h +++ b/arch/powerpc/include/asm/firmware.h @@ -52,6 +52,7 @@ #define FW_FEATURE_PAPR_SCM ASM_CONST(0x0000002000000000) #define FW_FEATURE_ULTRAVISOR ASM_CONST(0x0000004000000000) #define FW_FEATURE_STUFF_TCE ASM_CONST(0x0000008000000000) +#define FW_FEATURE_RPT_INVALIDATE ASM_CONST(0x0000010000000000) #ifndef __ASSEMBLY__ @@ -71,7 +72,8 @@ enum { FW_FEATURE_TYPE1_AFFINITY | FW_FEATURE_PRRN | FW_FEATURE_HPT_RESIZE | FW_FEATURE_DRMEM_V2 | FW_FEATURE_DRC_INFO | FW_FEATURE_BLOCK_REMOVE | - FW_FEATURE_PAPR_SCM | FW_FEATURE_ULTRAVISOR, + FW_FEATURE_PAPR_SCM | FW_FEATURE_ULTRAVISOR | + FW_FEATURE_RPT_INVALIDATE, FW_FEATURE_PSERIES_ALWAYS = 0, FW_FEATURE_POWERNV_POSSIBLE = FW_FEATURE_OPAL | FW_FEATURE_ULTRAVISOR, FW_FEATURE_POWERNV_ALWAYS = 0, |