From 95d38fd0bcf1996082f5f8762e6f1c849755e0c6 Mon Sep 17 00:00:00 2001 From: Christian Borntraeger Date: Fri, 17 May 2013 14:41:34 +0200 Subject: [PATCH] s390/kvm: Mark if a cpu is in SIE Lets track in a private bit if the sie control block is active. We want to track this as closely as possible, so we also have to instrument the interrupt and program check handler. Lets use the existing HANDLE_SIE_INTERCEPT macro. Signed-off-by: Christian Borntraeger Acked-by: Martin Schwidefsky Signed-off-by: Gleb Natapov --- arch/s390/include/asm/kvm_host.h | 5 ++++- arch/s390/kernel/asm-offsets.c | 2 ++ arch/s390/kernel/entry64.S | 10 +++++++--- 3 files changed, 13 insertions(+), 4 deletions(-) diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index 16bd5d1..962b92e 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -68,7 +68,10 @@ struct sca_block { struct kvm_s390_sie_block { atomic_t cpuflags; /* 0x0000 */ __u32 prefix; /* 0x0004 */ - __u8 reserved8[32]; /* 0x0008 */ + __u8 reserved08[4]; /* 0x0008 */ +#define PROG_IN_SIE (1<<0) + __u32 prog0c; /* 0x000c */ + __u8 reserved10[24]; /* 0x0010 */ __u64 cputm; /* 0x0028 */ __u64 ckc; /* 0x0030 */ __u64 epoch; /* 0x0038 */ diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c index 7a82f9f..6456bbe 100644 --- a/arch/s390/kernel/asm-offsets.c +++ b/arch/s390/kernel/asm-offsets.c @@ -7,6 +7,7 @@ #define ASM_OFFSETS_C #include +#include #include #include #include @@ -161,6 +162,7 @@ int main(void) DEFINE(__LC_PGM_TDB, offsetof(struct _lowcore, pgm_tdb)); DEFINE(__THREAD_trap_tdb, offsetof(struct task_struct, thread.trap_tdb)); DEFINE(__GMAP_ASCE, offsetof(struct gmap, asce)); + DEFINE(__SIE_PROG0C, offsetof(struct kvm_s390_sie_block, prog0c)); #endif /* CONFIG_32BIT */ return 0; } diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index 4c17eec..c2e81b4 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -84,7 +84,7 @@ _TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING) .macro HANDLE_SIE_INTERCEPT scratch,pgmcheck #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) tmhh %r8,0x0001 # interrupting from user ? - jnz .+42 + jnz .+52 lgr \scratch,%r9 slg \scratch,BASED(.Lsie_loop) clg \scratch,BASED(.Lsie_length) @@ -92,12 +92,14 @@ _TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING) # Some program interrupts are suppressing (e.g. protection). # We must also check the instruction after SIE in that case. # do_protection_exception will rewind to rewind_pad - jh .+22 + jh .+32 .else - jhe .+22 + jhe .+32 .endif lg %r9,BASED(.Lsie_loop) LPP BASED(.Lhost_id) # set host id + lg %r14,__SF_EMPTY(%r15) # get control block pointer + ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE #endif .endm @@ -956,10 +958,12 @@ sie_loop: lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce sie_gmap: lg %r14,__SF_EMPTY(%r15) # get control block pointer + oi __SIE_PROG0C+3(%r14),1 # we are in SIE now LPP __SF_EMPTY(%r15) # set guest id sie 0(%r14) sie_done: LPP __SF_EMPTY+16(%r15) # set host id + ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE lg %r14,__LC_THREAD_INFO # pointer thread_info struct sie_exit: lctlg %c1,%c1,__LC_USER_ASCE # load primary asce -- 2.7.4