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| author | Carsten Otte <cotte@de.ibm.com> | 2011-04-20 10:15:36 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2011-04-20 10:15:44 +0200 |
| commit | 9ff4cfb3fcfd48b49fdd9be7381b3be340853aa4 (patch) | |
| tree | f009abfed6f9077d487764c8c7ca7e8dc3eb0346 | |
| parent | c7a29e56f0a3526b71e9694b403b8e2cbe9c31e5 (diff) | |
| download | blackbird-op-linux-9ff4cfb3fcfd48b49fdd9be7381b3be340853aa4.tar.gz blackbird-op-linux-9ff4cfb3fcfd48b49fdd9be7381b3be340853aa4.zip | |
[S390] kvm-390: Let kernel exit SIE instruction on work
From: Christian Borntraeger <borntraeger@de.ibm.com>
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: stable@kernel.org
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| -rw-r--r-- | 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 7e9d30d567b0..ab0e041ac54c 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 /* |
