Revision c15e0ae42c8e5a61e9aca8aac920517cf7b3e94e authored by Li RongQing on 09 March 2022, 08:35:44 UTC, committed by Paolo Bonzini on 02 April 2022, 09:37:27 UTC
If apic_id is less than min, and (max - apic_id) is greater than KVM_IPI_CLUSTER_SIZE, then the third check condition is satisfied but the new apic_id does not fit the bitmask. In this case __send_ipi_mask should send the IPI. This is mostly theoretical, but it can happen if the apic_ids on three iterations of the loop are for example 1, KVM_IPI_CLUSTER_SIZE, 0. Fixes: aaffcfd1e82 ("KVM: X86: Implement PV IPIs in linux guest") Signed-off-by: Li RongQing <lirongqing@baidu.com> Message-Id: <1646814944-51801-1-git-send-email-lirongqing@baidu.com> Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
1 parent 2a8859f
shuffle.h
// SPDX-License-Identifier: GPL-2.0
// Copyright(c) 2018 Intel Corporation. All rights reserved.
#ifndef _MM_SHUFFLE_H
#define _MM_SHUFFLE_H
#include <linux/jump_label.h>
#define SHUFFLE_ORDER (MAX_ORDER-1)
#ifdef CONFIG_SHUFFLE_PAGE_ALLOCATOR
DECLARE_STATIC_KEY_FALSE(page_alloc_shuffle_key);
extern void __shuffle_free_memory(pg_data_t *pgdat);
extern bool shuffle_pick_tail(void);
static inline void __meminit shuffle_free_memory(pg_data_t *pgdat)
{
if (!static_branch_unlikely(&page_alloc_shuffle_key))
return;
__shuffle_free_memory(pgdat);
}
extern void __shuffle_zone(struct zone *z);
static inline void __meminit shuffle_zone(struct zone *z)
{
if (!static_branch_unlikely(&page_alloc_shuffle_key))
return;
__shuffle_zone(z);
}
static inline bool is_shuffle_order(int order)
{
if (!static_branch_unlikely(&page_alloc_shuffle_key))
return false;
return order >= SHUFFLE_ORDER;
}
#else
static inline bool shuffle_pick_tail(void)
{
return false;
}
static inline void shuffle_free_memory(pg_data_t *pgdat)
{
}
static inline void shuffle_zone(struct zone *z)
{
}
static inline bool is_shuffle_order(int order)
{
return false;
}
#endif
#endif /* _MM_SHUFFLE_H */
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