From: Nicholas Piggin Date: Mon, 29 May 2017 06:26:44 +0000 (+1000) Subject: powerpc/64s: Machine check handle ifetch from foreign real address for POWER9 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=90df4bfb4d9e00a1ab6885900b808bef2b62a21c;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git powerpc/64s: Machine check handle ifetch from foreign real address for POWER9 The i-side 0111b machine check, which is "Instruction Fetch to foreign address space", was missed by 7b9f71f974 ("powerpc/64s: POWER9 machine check handler"). The POWER9 processor core considers host real addresses with a nonzero value in RA(8:12) as foreign address space, accessible only by the copy and paste instructions. The copy and paste instruction pair can be used to invoke the Nest accelerators via the Virtual Accelerator Switchboard (VAS). It is an error for any regular load/store or ifetch to go to a foreign addresses. When relocation is on, this causes an MMU exception. When relocation is off, a machine check exception. It is possible to trigger this machine check by branching to a foreign address with MSR[IR]=0. Fixes: 7b9f71f974a1 ("powerpc/64s: POWER9 machine check handler") Reported-by: Mahesh Salgaonkar Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman --- diff --git a/arch/powerpc/include/asm/mce.h b/arch/powerpc/include/asm/mce.h index 81eff8631434..190d69a7f701 100644 --- a/arch/powerpc/include/asm/mce.h +++ b/arch/powerpc/include/asm/mce.h @@ -90,13 +90,14 @@ enum MCE_UserErrorType { enum MCE_RaErrorType { MCE_RA_ERROR_INDETERMINATE = 0, MCE_RA_ERROR_IFETCH = 1, - MCE_RA_ERROR_PAGE_TABLE_WALK_IFETCH = 2, - MCE_RA_ERROR_PAGE_TABLE_WALK_IFETCH_FOREIGN = 3, - MCE_RA_ERROR_LOAD = 4, - MCE_RA_ERROR_STORE = 5, - MCE_RA_ERROR_PAGE_TABLE_WALK_LOAD_STORE = 6, - MCE_RA_ERROR_PAGE_TABLE_WALK_LOAD_STORE_FOREIGN = 7, - MCE_RA_ERROR_LOAD_STORE_FOREIGN = 8, + MCE_RA_ERROR_IFETCH_FOREIGN = 2, + MCE_RA_ERROR_PAGE_TABLE_WALK_IFETCH = 3, + MCE_RA_ERROR_PAGE_TABLE_WALK_IFETCH_FOREIGN = 4, + MCE_RA_ERROR_LOAD = 5, + MCE_RA_ERROR_STORE = 6, + MCE_RA_ERROR_PAGE_TABLE_WALK_LOAD_STORE = 7, + MCE_RA_ERROR_PAGE_TABLE_WALK_LOAD_STORE_FOREIGN = 8, + MCE_RA_ERROR_LOAD_STORE_FOREIGN = 9, }; enum MCE_LinkErrorType { diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c index 5f9eada3519b..92f185875694 100644 --- a/arch/powerpc/kernel/mce.c +++ b/arch/powerpc/kernel/mce.c @@ -268,6 +268,7 @@ void machine_check_print_event_info(struct machine_check_event *evt, static const char *mc_ra_types[] = { "Indeterminate", "Instruction fetch (bad)", + "Instruction fetch (foreign)", "Page table walk ifetch (bad)", "Page table walk ifetch (foreign)", "Load (bad)", diff --git a/arch/powerpc/kernel/mce_power.c b/arch/powerpc/kernel/mce_power.c index f913139bb0c2..d24e689e893f 100644 --- a/arch/powerpc/kernel/mce_power.c +++ b/arch/powerpc/kernel/mce_power.c @@ -236,6 +236,9 @@ static const struct mce_ierror_table mce_p9_ierror_table[] = { { 0x00000000081c0000, 0x0000000000180000, true, MCE_ERROR_TYPE_UE, MCE_UE_ERROR_PAGE_TABLE_WALK_IFETCH, MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, }, +{ 0x00000000081c0000, 0x00000000001c0000, true, + MCE_ERROR_TYPE_RA, MCE_RA_ERROR_IFETCH_FOREIGN, + MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, }, { 0x00000000081c0000, 0x0000000008000000, true, MCE_ERROR_TYPE_LINK,MCE_LINK_ERROR_IFETCH_TIMEOUT, MCE_INITIATOR_CPU, MCE_SEV_ERROR_SYNC, },