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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 
KVM: x86: fix sending PV IPI
 
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
Raw File
gup_test.h 
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef __GUP_TEST_H
#define __GUP_TEST_H

#include <linux/types.h>

#define GUP_FAST_BENCHMARK	_IOWR('g', 1, struct gup_test)
#define PIN_FAST_BENCHMARK	_IOWR('g', 2, struct gup_test)
#define PIN_LONGTERM_BENCHMARK	_IOWR('g', 3, struct gup_test)
#define GUP_BASIC_TEST		_IOWR('g', 4, struct gup_test)
#define PIN_BASIC_TEST		_IOWR('g', 5, struct gup_test)
#define DUMP_USER_PAGES_TEST	_IOWR('g', 6, struct gup_test)

#define GUP_TEST_MAX_PAGES_TO_DUMP		8

#define GUP_TEST_FLAG_DUMP_PAGES_USE_PIN	0x1

struct gup_test {
	__u64 get_delta_usec;
	__u64 put_delta_usec;
	__u64 addr;
	__u64 size;
	__u32 nr_pages_per_call;
	__u32 gup_flags;
	__u32 test_flags;
	/*
	 * Each non-zero entry is the number of the page (1-based: first page is
	 * page 1, so that zero entries mean "do nothing") from the .addr base.
	 */
	__u32 which_pages[GUP_TEST_MAX_PAGES_TO_DUMP];
};

#endif	/* __GUP_TEST_H */
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