Commit ddd6f953 authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

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



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: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 4baeb964

arch/s390/include/asm/lowcore.h

+1 −1
Original line number Diff line number Diff line
@@ -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 */

arch/s390/kernel/asm-offsets.c

+0 −1
Original line number Diff line number Diff line
@@ -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;

arch/s390/kernel/entry64.S

+5 −2
Original line number Diff line number Diff line
@@ -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

arch/s390/kernel/setup.c

+0 −1
Original line number Diff line number Diff line
@@ -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;

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