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[S390] kvm: move cmf host id constant out of lowcore

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There is no reason for the cpu-measurement-facility host id constant to
reside in the lowcore where space is precious. Use an entry in the literal
pool in HANDLE_SIE_INTERCEPT and a stack slot in sie64a.
While we are at it replace the id -1 with 0 to indicate host execution.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2011-12-27 11:27:13 +01:00
parent 4baeb964d9
commit ddd6f9537d
4 changed files with 6 additions and 5 deletions
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2
arch/s390/include/asm/lowcore.h
View file

@ -271,7 +271,7 @@ struct _lowcore {
__u64 machine_flags; /* 0x0360 */
__u64 ftrace_func; /* 0x0368 */
__u64 gmap; /* 0x0370 */
__u64 cmf_hpp; /* 0x0378 */
__u8 pad_0x0378[0x0380-0x0378]; /* 0x0378 */
/* Interrupt response block. */
__u8 irb[64]; /* 0x0380 */

1
arch/s390/kernel/asm-offsets.c
View file

@ -150,7 +150,6 @@ int main(void)
DEFINE(__LC_LAST_BREAK, offsetof(struct _lowcore, breaking_event_addr));
DEFINE(__LC_VDSO_PER_CPU, offsetof(struct _lowcore, vdso_per_cpu_data));
DEFINE(__LC_GMAP, offsetof(struct _lowcore, gmap));
DEFINE(__LC_CMF_HPP, offsetof(struct _lowcore, cmf_hpp));
DEFINE(__GMAP_ASCE, offsetof(struct gmap, asce));
#endif /* CONFIG_32BIT */
return 0;

7
arch/s390/kernel/entry64.S
View file

@ -71,7 +71,7 @@ _TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
tm __TI_flags+6(%r12),_TIF_SIE>>8
jz 0f
SPP __LC_CMF_HPP # set host id
SPP BASED(.Lhost_id) # set host id
clc SP_PSW+8(8,%r15),BASED(.Lsie_loop)
jl 0f
clc SP_PSW+8(8,%r15),BASED(.Lsie_done)
@ -1054,6 +1054,7 @@ ENTRY(sie64a)
stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers
stg %r2,__SF_EMPTY(%r15) # save control block pointer
stg %r3,__SF_EMPTY+8(%r15) # save guest register save area
xc __SF_EMPTY+16(8,%r15),__SF_EMPTY+16(%r15) # host id == 0
lmg %r0,%r13,0(%r3) # load guest gprs 0-13
lg %r14,__LC_THREAD_INFO # pointer thread_info struct
oi __TI_flags+6(%r14),_TIF_SIE>>8
@ -1070,7 +1071,7 @@ sie_gmap:
SPP __SF_EMPTY(%r15) # set guest id
sie 0(%r14)
sie_done:
SPP __LC_CMF_HPP # set host id
SPP __SF_EMPTY+16(%r15) # set host id
lg %r14,__LC_THREAD_INFO # pointer thread_info struct
sie_exit:
lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
@ -1095,6 +1096,8 @@ sie_fault:
.quad sie_loop
.Lsie_done:
.quad sie_done
.Lhost_id:
.quad 0
.section __ex_table,"a"
.quad sie_loop,sie_fault

1
arch/s390/kernel/setup.c
View file

@ -400,7 +400,6 @@ setup_lowcore(void)
__ctl_set_bit(14, 29);
}
#else
lc->cmf_hpp = -1ULL;
lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
#endif
lc->sync_enter_timer = S390_lowcore.sync_enter_timer;