mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

target/ppc: Fix pending HDEC when entering PM state

Browse Source 
HDEC is defined to not wake from PM state. There is a check in the HDEC
timer to avoid setting the interrupt if we are in a PM state, but no
check on PM entry to lower HDEC if it already fired. This can cause a
HDECR wake up and  QEMU abort with unsupported exception in Power Save
mode.

Fixes: 4b236b621bf ("ppc: Initial HDEC support")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-ID: <20230726182230.433945-4-npiggin@gmail.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
(cherry picked from commit 9915dac4847f3cc5ffd36e4c374a4eec83fe09b5)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Nicholas Piggin 2023-07-27 04:22:27 +10:00 committed by Michael Tokarev
parent 74619c052d
commit 4afce84629
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
target/ppc/excp_helper.c
View File

@ -2645,6 +2645,12 @@ void helper_pminsn(CPUPPCState *env, uint32_t insn)
env->resume_as_sreset = (insn != PPC_PM_STOP) ||
(env->spr[SPR_PSSCR] & PSSCR_EC);
/* HDECR is not to wake from PM state, it may have already fired */
if (env->resume_as_sreset) {
PowerPCCPU *cpu = env_archcpu(env);
ppc_set_irq(cpu, PPC_INTERRUPT_HDECR, 0);
}
ppc_maybe_interrupt(env);
}
#endif /* defined(TARGET_PPC64) */