From da72ca4d4090a8ab0e6b0a23682ef42d39d7ae00 Mon Sep 17 00:00:00 2001 From: QingFeng Hao Date: Wed, 7 Jun 2017 11:41:19 +0200 Subject: KVM: s390: Backup the guest's machine check info When a machine check happens in the guest, related mcck info (mcic, external damage code, ...) is stored in the vcpu's lowcore on the host. Then the machine check handler's low-level part is executed, followed by the high-level part. If the high-level part's execution is interrupted by a new machine check happening on the same vcpu on the host, the mcck info in the lowcore is overwritten with the new machine check's data. If the high-level part's execution is scheduled to a different cpu, the mcck info in the lowcore is uncertain. Therefore, for both cases, the further reinjection to the guest will use the wrong data. Let's backup the mcck info in the lowcore to the sie page for further reinjection, so that the right data will be used. Add new member into struct sie_page to store related machine check's info of mcic, failing storage address and external damage code. Signed-off-by: QingFeng Hao Acked-by: Christian Borntraeger Signed-off-by: Christian Borntraeger --- arch/s390/include/asm/kvm_host.h | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) (limited to 'arch/s390/include/asm/kvm_host.h') diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index 426614a882a9..c6e1d5fa1ad1 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -107,6 +107,20 @@ struct esca_block { struct esca_entry cpu[KVM_S390_ESCA_CPU_SLOTS]; } __packed; +/* + * This struct is used to store some machine check info from lowcore + * for machine checks that happen while the guest is running. + * This info in host's lowcore might be overwritten by a second machine + * check from host when host is in the machine check's high-level handling. + * The size is 24 bytes. + */ +struct mcck_volatile_info { + __u64 mcic; + __u64 failing_storage_address; + __u32 ext_damage_code; + __u32 reserved; +}; + #define CPUSTAT_STOPPED 0x80000000 #define CPUSTAT_WAIT 0x10000000 #define CPUSTAT_ECALL_PEND 0x08000000 @@ -264,7 +278,8 @@ struct kvm_s390_itdb { struct sie_page { struct kvm_s390_sie_block sie_block; - __u8 reserved200[1024]; /* 0x0200 */ + struct mcck_volatile_info mcck_info; /* 0x0200 */ + __u8 reserved218[1000]; /* 0x0218 */ struct kvm_s390_itdb itdb; /* 0x0600 */ __u8 reserved700[2304]; /* 0x0700 */ } __packed; -- cgit v1.2.3-59-g8ed1b