s390/nmi: s390: New low level handling for machine check happening in guest
Add the logic to check if the machine check happens when the guest is running. If yes, set the exit reason -EINTR in the machine check's interrupt handler. Refactor s390_do_machine_check to avoid panicing the host for some kinds of machine checks which happen when guest is running. Reinject the instruction processing damage's machine checks including Delayed Access Exception instead of damaging the host if it happens in the guest because it could be caused by improper update on TLB entry or other software case and impacts the guest only. Signed-off-by: QingFeng Hao <haoqf@linux.vnet.ibm.com> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
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@ -14,7 +14,14 @@
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#include <linux/const.h>
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#include <linux/types.h>
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#define MCIC_SUBCLASS_MASK (1ULL<<63 | 1ULL<<62 | 1ULL<<61 | \
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1ULL<<59 | 1ULL<<58 | 1ULL<<56 | \
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1ULL<<55 | 1ULL<<54 | 1ULL<<53 | \
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1ULL<<52 | 1ULL<<47 | 1ULL<<46 | \
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1ULL<<45 | 1ULL<<44)
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#define MCCK_CODE_SYSTEM_DAMAGE _BITUL(63)
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#define MCCK_CODE_EXT_DAMAGE _BITUL(63 - 5)
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#define MCCK_CODE_CP _BITUL(63 - 9)
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#define MCCK_CODE_CPU_TIMER_VALID _BITUL(63 - 46)
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#define MCCK_CODE_PSW_MWP_VALID _BITUL(63 - 20)
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#define MCCK_CODE_PSW_IA_VALID _BITUL(63 - 23)
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@ -20,6 +20,7 @@
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#define CIF_FPU 4 /* restore FPU registers */
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#define CIF_IGNORE_IRQ 5 /* ignore interrupt (for udelay) */
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#define CIF_ENABLED_WAIT 6 /* in enabled wait state */
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#define CIF_MCCK_GUEST 7 /* machine check happening in guest */
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#define _CIF_MCCK_PENDING _BITUL(CIF_MCCK_PENDING)
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#define _CIF_ASCE_PRIMARY _BITUL(CIF_ASCE_PRIMARY)
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@ -28,6 +29,7 @@
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#define _CIF_FPU _BITUL(CIF_FPU)
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#define _CIF_IGNORE_IRQ _BITUL(CIF_IGNORE_IRQ)
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#define _CIF_ENABLED_WAIT _BITUL(CIF_ENABLED_WAIT)
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#define _CIF_MCCK_GUEST _BITUL(CIF_MCCK_GUEST)
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#ifndef __ASSEMBLY__
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@ -58,6 +58,9 @@ int main(void)
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OFFSET(__SF_BACKCHAIN, stack_frame, back_chain);
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OFFSET(__SF_GPRS, stack_frame, gprs);
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OFFSET(__SF_EMPTY, stack_frame, empty1);
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OFFSET(__SF_SIE_CONTROL, stack_frame, empty1[0]);
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OFFSET(__SF_SIE_SAVEAREA, stack_frame, empty1[1]);
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OFFSET(__SF_SIE_REASON, stack_frame, empty1[2]);
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BLANK();
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/* timeval/timezone offsets for use by vdso */
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OFFSET(__VDSO_UPD_COUNT, vdso_data, tb_update_count);
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@ -225,6 +225,7 @@ ENTRY(sie64a)
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jnz .Lsie_skip
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TSTMSK __LC_CPU_FLAGS,_CIF_FPU
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jo .Lsie_skip # exit if fp/vx regs changed
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.Lsie_entry:
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sie 0(%r14)
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.Lsie_skip:
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ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE
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@ -1102,7 +1103,13 @@ cleanup_critical:
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.quad .Lsie_done
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.Lcleanup_sie:
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lg %r9,__SF_EMPTY(%r15) # get control block pointer
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cghi %r11,__LC_SAVE_AREA_ASYNC #Is this in normal interrupt?
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je 1f
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slg %r9,BASED(.Lsie_crit_mcck_start)
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clg %r9,BASED(.Lsie_crit_mcck_length)
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jh 1f
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oi __LC_CPU_FLAGS+7, _CIF_MCCK_GUEST
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1: lg %r9,__SF_EMPTY(%r15) # get control block pointer
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ni __SIE_PROG0C+3(%r9),0xfe # no longer in SIE
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lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
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larl %r9,sie_exit # skip forward to sie_exit
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@ -1274,6 +1281,10 @@ cleanup_critical:
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.quad .Lsie_gmap
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.Lsie_critical_length:
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.quad .Lsie_done - .Lsie_gmap
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.Lsie_crit_mcck_start:
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.quad .Lsie_entry
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.Lsie_crit_mcck_length:
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.quad .Lsie_skip - .Lsie_entry
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#endif
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.section .rodata, "a"
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@ -25,6 +25,7 @@
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#include <asm/crw.h>
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#include <asm/switch_to.h>
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#include <asm/ctl_reg.h>
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#include <asm/asm-offsets.h>
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struct mcck_struct {
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unsigned int kill_task : 1;
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@ -280,6 +281,8 @@ static int notrace s390_validate_registers(union mci mci, int umode)
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#define ED_STP_ISLAND 6 /* External damage STP island check */
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#define ED_STP_SYNC 7 /* External damage STP sync check */
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#define MCCK_CODE_NO_GUEST (MCCK_CODE_CP | MCCK_CODE_EXT_DAMAGE)
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/*
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* machine check handler.
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*/
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@ -291,6 +294,7 @@ void notrace s390_do_machine_check(struct pt_regs *regs)
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struct mcck_struct *mcck;
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unsigned long long tmp;
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union mci mci;
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unsigned long mcck_dam_code;
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nmi_enter();
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inc_irq_stat(NMI_NMI);
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@ -301,7 +305,13 @@ void notrace s390_do_machine_check(struct pt_regs *regs)
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/* System damage -> stopping machine */
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s390_handle_damage();
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}
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if (mci.pd) {
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/*
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* Reinject the instruction processing damages' machine checks
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* including Delayed Access Exception into the guest
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* instead of damaging the host if they happen in the guest.
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*/
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if (mci.pd && !test_cpu_flag(CIF_MCCK_GUEST)) {
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if (mci.b) {
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/* Processing backup -> verify if we can survive this */
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u64 z_mcic, o_mcic, t_mcic;
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@ -358,6 +368,12 @@ void notrace s390_do_machine_check(struct pt_regs *regs)
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if (mcck->stp_queue)
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set_cpu_flag(CIF_MCCK_PENDING);
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}
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/*
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* Reinject storage related machine checks into the guest if they
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* happen when the guest is running.
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*/
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if (!test_cpu_flag(CIF_MCCK_GUEST)) {
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if (mci.se)
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/* Storage error uncorrected */
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s390_handle_damage();
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@ -367,6 +383,7 @@ void notrace s390_do_machine_check(struct pt_regs *regs)
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if (mci.ds && mci.fa)
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/* Storage degradation */
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s390_handle_damage();
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}
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if (mci.cp) {
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/* Channel report word pending */
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mcck->channel_report = 1;
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@ -377,6 +394,19 @@ void notrace s390_do_machine_check(struct pt_regs *regs)
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mcck->warning = 1;
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set_cpu_flag(CIF_MCCK_PENDING);
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}
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/*
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* If there are only Channel Report Pending and External Damage
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* machine checks, they will not be reinjected into the guest
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* because they refer to host conditions only.
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*/
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mcck_dam_code = (mci.val & MCIC_SUBCLASS_MASK);
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if (test_cpu_flag(CIF_MCCK_GUEST) &&
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(mcck_dam_code & MCCK_CODE_NO_GUEST) != mcck_dam_code) {
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/* Set exit reason code for host's later handling */
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*((long *)(regs->gprs[15] + __SF_SIE_REASON)) = -EINTR;
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}
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clear_cpu_flag(CIF_MCCK_GUEST);
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nmi_exit();
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}
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