commit: 9ff4cfb3fcfd48b49fdd9be7381b3be340853aa4 From: Carsten Otte <[email protected]> Date: Wed, 20 Apr 2011 10:15:36 +0200 Subject: [PATCH] [S390] kvm-390: Let kernel exit SIE instruction on work
From: Christian Borntraeger <[email protected]> This patch fixes the sie exit on interrupts. The low level interrupt handler returns to the PSW address in pt_regs and not to the PSW address in the lowcore. Without this fix a cpu bound guest might never leave guest state since the host interrupt handler would blindly return to the SIE instruction, even on need_resched and friends. Cc: [email protected] Signed-off-by: Carsten Otte <[email protected]> Signed-off-by: Christian Borntraeger <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]> --- arch/s390/kvm/sie64a.S | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/s390/kvm/sie64a.S b/arch/s390/kvm/sie64a.S index 7e9d30d..ab0e041 100644 --- a/arch/s390/kvm/sie64a.S +++ b/arch/s390/kvm/sie64a.S @@ -48,10 +48,10 @@ sie_irq_handler: tm __TI_flags+7(%r2),_TIF_EXIT_SIE jz 0f larl %r2,sie_exit # work pending, leave sie - stg %r2,__LC_RETURN_PSW+8 + stg %r2,SPI_PSW+8(0,%r15) br %r14 0: larl %r2,sie_reenter # re-enter with guest id - stg %r2,__LC_RETURN_PSW+8 + stg %r2,SPI_PSW+8(0,%r15) 1: br %r14 /* _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
