diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2021-05-03 15:02:42 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-06-21 13:13:19 +0200 |
| commit | 393eff5a7b357a23db3e786e24b5ba8762cc6820 (patch) | |
| tree | 9dc3e36bd70446894232a9036c23c3f3e3159231 /arch | |
| parent | powerpc/security: Add a security feature for STF barrier (diff) | |
| download | linux-393eff5a7b357a23db3e786e24b5ba8762cc6820.tar.xz linux-393eff5a7b357a23db3e786e24b5ba8762cc6820.zip | |
powerpc/pesries: Get STF barrier requirement from H_GET_CPU_CHARACTERISTICS
This allows the hypervisor / firmware to describe this workarounds to
the guest.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210503130243.891868-4-npiggin@gmail.com
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/hvcall.h | 1 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/setup.c | 3 |
2 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h index d769ffbb04f2..2a6346b6472f 100644 --- a/arch/powerpc/include/asm/hvcall.h +++ b/arch/powerpc/include/asm/hvcall.h @@ -402,6 +402,7 @@ #define H_CPU_BEHAV_FLUSH_LINK_STACK (1ull << 57) // IBM bit 6 #define H_CPU_BEHAV_NO_L1D_FLUSH_ENTRY (1ull << 56) // IBM bit 7 #define H_CPU_BEHAV_NO_L1D_FLUSH_UACCESS (1ull << 55) // IBM bit 8 +#define H_CPU_BEHAV_NO_STF_BARRIER (1ull << 54) // IBM bit 9 /* Flag values used in H_REGISTER_PROC_TBL hcall */ #define PROC_TABLE_OP_MASK 0x18 diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c index 287f33645419..631a0d57b6cd 100644 --- a/arch/powerpc/platforms/pseries/setup.c +++ b/arch/powerpc/platforms/pseries/setup.c @@ -555,6 +555,9 @@ static void init_cpu_char_feature_flags(struct h_cpu_char_result *result) if (result->behaviour & H_CPU_BEHAV_NO_L1D_FLUSH_UACCESS) security_ftr_clear(SEC_FTR_L1D_FLUSH_UACCESS); + if (result->behaviour & H_CPU_BEHAV_NO_STF_BARRIER) + security_ftr_clear(SEC_FTR_STF_BARRIER); + if (!(result->behaviour & H_CPU_BEHAV_BNDS_CHK_SPEC_BAR)) security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR); } |