From 86dacd967b80114c0c6cf0648ed1dcaea8853937 Mon Sep 17 00:00:00 2001 From: Rohan McLure Date: Wed, 10 May 2023 13:31:14 +1000 Subject: powerpc: Mark writes registering ipi to host cpu through kvm and polling Mark writes to hypervisor ipi state so that KCSAN recognises these asynchronous issue of kvmppc_{set,clear}_host_ipi to be intended, with atomic writes. Mark asynchronous polls to this variable in kvm_ppc_read_one_intr(). Signed-off-by: Rohan McLure Reviewed-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://msgid.link/20230510033117.1395895-9-rmclure@linux.ibm.com --- arch/powerpc/include/asm/kvm_ppc.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'arch/powerpc/include/asm/kvm_ppc.h') diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index 79a9c0bb8bba..d16d80ad2ae4 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -548,12 +548,12 @@ static inline void kvmppc_set_host_ipi(int cpu) * pairs with the barrier in kvmppc_clear_host_ipi() */ smp_mb(); - paca_ptrs[cpu]->kvm_hstate.host_ipi = 1; + WRITE_ONCE(paca_ptrs[cpu]->kvm_hstate.host_ipi, 1); } static inline void kvmppc_clear_host_ipi(int cpu) { - paca_ptrs[cpu]->kvm_hstate.host_ipi = 0; + WRITE_ONCE(paca_ptrs[cpu]->kvm_hstate.host_ipi, 0); /* * order clearing of host_ipi flag vs. processing of IPI messages * -- cgit