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Commit aec3b2c5 authored by Christian Borntraeger's avatar Christian Borntraeger
Browse files

Merge tag 'nmiforkvm' of... 

Merge tag 'nmiforkvm' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into kernelorgnext

s390,kvm: provide plumbing for machines checks when running guests

This provides the basic plumbing for handling machine checks when
running guests
parents 1cae0255 da72ca4d

arch/s390/include/asm/kvm_host.h

+16 −1
Original line number Diff line number Diff line
@@ -109,6 +109,20 @@ struct esca_block { 
	struct esca_entry cpu[KVM_S390_ESCA_CPU_SLOTS];

};



/*

 * 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
@@ -266,7 +280,8 @@ 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 */

};

arch/s390/include/asm/nmi.h

+7 −0
Original line number Diff line number Diff line
@@ -14,7 +14,14 @@ 
#include <linux/const.h>

#include <linux/types.h>



#define MCIC_SUBCLASS_MASK	(1ULL<<63 | 1ULL<<62 | 1ULL<<61 | \

				1ULL<<59 | 1ULL<<58 | 1ULL<<56 | \

				1ULL<<55 | 1ULL<<54 | 1ULL<<53 | \

				1ULL<<52 | 1ULL<<47 | 1ULL<<46 | \

				1ULL<<45 | 1ULL<<44)

#define MCCK_CODE_SYSTEM_DAMAGE		_BITUL(63)

#define MCCK_CODE_EXT_DAMAGE		_BITUL(63 - 5)

#define MCCK_CODE_CP			_BITUL(63 - 9)

#define MCCK_CODE_CPU_TIMER_VALID	_BITUL(63 - 46)

#define MCCK_CODE_PSW_MWP_VALID		_BITUL(63 - 20)

#define MCCK_CODE_PSW_IA_VALID		_BITUL(63 - 23)

arch/s390/include/asm/processor.h

+2 −0
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#define CIF_FPU			4	/* restore FPU registers */

#define CIF_IGNORE_IRQ		5	/* ignore interrupt (for udelay) */

#define CIF_ENABLED_WAIT	6	/* in enabled wait state */

#define CIF_MCCK_GUEST		7	/* machine check happening in guest */



#define _CIF_MCCK_PENDING	_BITUL(CIF_MCCK_PENDING)

#define _CIF_ASCE_PRIMARY	_BITUL(CIF_ASCE_PRIMARY)
@@ -28,6 +29,7 @@ 
#define _CIF_FPU		_BITUL(CIF_FPU)

#define _CIF_IGNORE_IRQ		_BITUL(CIF_IGNORE_IRQ)

#define _CIF_ENABLED_WAIT	_BITUL(CIF_ENABLED_WAIT)

#define _CIF_MCCK_GUEST		_BITUL(CIF_MCCK_GUEST)



#ifndef __ASSEMBLY__

arch/s390/kernel/asm-offsets.c

+3 −0
Original line number Diff line number Diff line
@@ -58,6 +58,9 @@ int main(void) 
	OFFSET(__SF_BACKCHAIN, stack_frame, back_chain);

	OFFSET(__SF_GPRS, stack_frame, gprs);

	OFFSET(__SF_EMPTY, stack_frame, empty1);

	OFFSET(__SF_SIE_CONTROL, stack_frame, empty1[0]);

	OFFSET(__SF_SIE_SAVEAREA, stack_frame, empty1[1]);

	OFFSET(__SF_SIE_REASON, stack_frame, empty1[2]);

	BLANK();

	/* timeval/timezone offsets for use by vdso */

	OFFSET(__VDSO_UPD_COUNT, vdso_data, tb_update_count);

arch/s390/kernel/entry.S

+12 −1
Original line number Diff line number Diff line
@@ -225,6 +225,7 @@ ENTRY(sie64a) 
	jnz	.Lsie_skip

	TSTMSK	__LC_CPU_FLAGS,_CIF_FPU

	jo	.Lsie_skip			# exit if fp/vx regs changed

.Lsie_entry:

	sie	0(%r14)

.Lsie_skip:

	ni	__SIE_PROG0C+3(%r14),0xfe	# no longer in SIE
@@ -1104,7 +1105,13 @@ cleanup_critical: 
	.quad	.Lsie_done



.Lcleanup_sie:

	lg	%r9,__SF_EMPTY(%r15)		# get control block pointer

	cghi    %r11,__LC_SAVE_AREA_ASYNC 	#Is this in normal interrupt?

	je      1f

	slg     %r9,BASED(.Lsie_crit_mcck_start)

	clg     %r9,BASED(.Lsie_crit_mcck_length)

	jh      1f

	oi      __LC_CPU_FLAGS+7, _CIF_MCCK_GUEST

1:	lg	%r9,__SF_EMPTY(%r15)		# get control block pointer

	ni	__SIE_PROG0C+3(%r9),0xfe	# no longer in SIE

	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce

	larl	%r9,sie_exit			# skip forward to sie_exit
@@ -1289,6 +1296,10 @@ cleanup_critical: 
	.quad	.Lsie_gmap

.Lsie_critical_length:

	.quad	.Lsie_done - .Lsie_gmap

.Lsie_crit_mcck_start:

	.quad   .Lsie_entry

.Lsie_crit_mcck_length:

	.quad   .Lsie_skip - .Lsie_entry

#endif



	.section .rodata, "a"