diff options
Diffstat (limited to 'arch/s390/kvm')
| -rw-r--r-- | arch/s390/kvm/Kconfig | 11 | ||||
| -rw-r--r-- | arch/s390/kvm/sie64a.S | 77 |
2 files changed, 75 insertions, 13 deletions
diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig index a7251580891..2f4b687cc7f 100644 --- a/arch/s390/kvm/Kconfig +++ b/arch/s390/kvm/Kconfig @@ -33,6 +33,17 @@ config KVM If unsure, say N. +config KVM_AWARE_CMF + depends on KVM + bool "KVM aware sampling" + ---help--- + This option enhances the sampling data from the CPU Measurement + Facility with additional information, that allows to distinguish + guest(s) and host when using the kernel based virtual machine + functionality. + + If unsure, say N. + # OK, it's a little counter-intuitive to do this, but it puts it neatly under # the virtualization menu. source drivers/vhost/Kconfig diff --git a/arch/s390/kvm/sie64a.S b/arch/s390/kvm/sie64a.S index 934fd6a885f..31646bd0e46 100644 --- a/arch/s390/kvm/sie64a.S +++ b/arch/s390/kvm/sie64a.S @@ -1,20 +1,60 @@ /* * sie64a.S - low level sie call * - * Copyright IBM Corp. 2008 + * Copyright IBM Corp. 2008,2010 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License (version 2 only) * as published by the Free Software Foundation. * * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com> + * Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> */ #include <linux/errno.h> #include <asm/asm-offsets.h> +#include <asm/setup.h> +#include <asm/asm-offsets.h> +#include <asm/ptrace.h> +#include <asm/thread_info.h> + +_TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING) + +/* + * offsets into stackframe + * SP_ = offsets into stack sie64 is called with + * SPI_ = offsets into irq stack + */ +SP_GREGS = __SF_EMPTY +SP_HOOK = __SF_EMPTY+8 +SP_GPP = __SF_EMPTY+16 +SPI_PSW = STACK_FRAME_OVERHEAD + __PT_PSW + -SP_R5 = 5 * 8 # offset into stackframe -SP_R6 = 6 * 8 + .macro SPP newpp +#ifdef CONFIG_KVM_AWARE_CMF + tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_SPP + jz 0f + .insn s,0xb2800000,\newpp + 0: +#endif + .endm + +sie_irq_handler: + SPP __LC_CMF_HPP # set host id + larl %r2,sie_inst + clg %r2,SPI_PSW+8(0,%r15) # intercepted sie + jne 1f + xc __LC_SIE_HOOK(8),__LC_SIE_HOOK + lg %r2,__LC_THREAD_INFO # pointer thread_info struct + tm __TI_flags+7(%r2),_TIF_EXIT_SIE + jz 0f + larl %r2,sie_exit # work pending, leave sie + stg %r2,__LC_RETURN_PSW+8 + br %r14 +0: larl %r2,sie_reenter # re-enter with guest id + stg %r2,__LC_RETURN_PSW+8 +1: br %r14 /* * sie64a calling convention: @@ -23,23 +63,34 @@ SP_R6 = 6 * 8 */ .globl sie64a sie64a: - lgr %r5,%r3 - stmg %r5,%r14,SP_R5(%r15) # save register on entry - lgr %r14,%r2 # pointer to sie control block - lmg %r0,%r13,0(%r3) # load guest gprs 0-13 + stg %r3,SP_GREGS(%r15) # save guest register save area + stmg %r6,%r14,__SF_GPRS(%r15) # save registers on entry + lgr %r14,%r2 # pointer to sie control block + larl %r5,sie_irq_handler + stg %r2,SP_GPP(%r15) + stg %r5,SP_HOOK(%r15) # save hook target + lmg %r0,%r13,0(%r3) # load guest gprs 0-13 +sie_reenter: + mvc __LC_SIE_HOOK(8),SP_HOOK(%r15) + SPP SP_GPP(%r15) # set guest id sie_inst: sie 0(%r14) - lg %r14,SP_R5(%r15) - stmg %r0,%r13,0(%r14) # save guest gprs 0-13 + xc __LC_SIE_HOOK(8),__LC_SIE_HOOK + SPP __LC_CMF_HPP # set host id +sie_exit: + lg %r14,SP_GREGS(%r15) + stmg %r0,%r13,0(%r14) # save guest gprs 0-13 lghi %r2,0 - lmg %r6,%r14,SP_R6(%r15) + lmg %r6,%r14,__SF_GPRS(%r15) br %r14 sie_err: - lg %r14,SP_R5(%r15) - stmg %r0,%r13,0(%r14) # save guest gprs 0-13 + xc __LC_SIE_HOOK(8),__LC_SIE_HOOK + SPP __LC_CMF_HPP # set host id + lg %r14,SP_GREGS(%r15) + stmg %r0,%r13,0(%r14) # save guest gprs 0-13 lghi %r2,-EFAULT - lmg %r6,%r14,SP_R6(%r15) + lmg %r6,%r14,__SF_GPRS(%r15) br %r14 .section __ex_table,"a" |