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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/powerpc/kvm/book3s_hv_hmi.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv_hmi.c')
-rw-r--r-- | arch/powerpc/kvm/book3s_hv_hmi.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_hmi.c b/arch/powerpc/kvm/book3s_hv_hmi.c new file mode 100644 index 000000000..1ec50c696 --- /dev/null +++ b/arch/powerpc/kvm/book3s_hv_hmi.c @@ -0,0 +1,50 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Hypervisor Maintenance Interrupt (HMI) handling. + * + * Copyright 2015 IBM Corporation + * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> + */ + +#undef DEBUG + +#include <linux/types.h> +#include <linux/compiler.h> +#include <asm/paca.h> +#include <asm/hmi.h> +#include <asm/processor.h> + +void wait_for_subcore_guest_exit(void) +{ + int i; + + /* + * NULL bitmap pointer indicates that KVM module hasn't + * been loaded yet and hence no guests are running, or running + * on POWER9 or newer CPU. + * + * If no KVM is in use, no need to co-ordinate among threads + * as all of them will always be in host and no one is going + * to modify TB other than the opal hmi handler. + * + * POWER9 and newer don't need this synchronisation. + * + * Hence, just return from here. + */ + if (!local_paca->sibling_subcore_state) + return; + + for (i = 0; i < MAX_SUBCORE_PER_CORE; i++) + while (local_paca->sibling_subcore_state->in_guest[i]) + cpu_relax(); +} + +void wait_for_tb_resync(void) +{ + if (!local_paca->sibling_subcore_state) + return; + + while (test_bit(CORE_TB_RESYNC_REQ_BIT, + &local_paca->sibling_subcore_state->flags)) + cpu_relax(); +} |