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Filename Latest commit message Latest commit date
Wanpeng Li 367b49086b KVM: LAPIC: Enable timer posted-interrupt only when mwait/hlt is advertised 
[ Upstream commit 1714a4eb6fb0cb79f182873cd011a8ed60ac65e8 ]

As commit 0c5f81dad4 ("KVM: LAPIC: Inject timer interrupt via posted
interrupt") mentioned that the host admin should well tune the guest
setup, so that vCPUs are placed on isolated pCPUs, and with several pCPUs
surplus for *busy* housekeeping.  In this setup, it is preferrable to
disable mwait/hlt/pause vmexits to keep the vCPUs in non-root mode.

However, if only some guests isolated and others not, they would not
have any benefit from posted timer interrupts, and at the same time lose
VMX preemption timer fast paths because kvm_can_post_timer_interrupt()
returns true and therefore forces kvm_can_use_hv_timer() to false.

By guaranteeing that posted-interrupt timer is only used if MWAIT or
HLT are done without vmexit, KVM can make a better choice and use the
VMX preemption timer and the corresponding fast paths.

Reported-by: Aili Yao <yaoaili@kingsoft.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Cc: Aili Yao <yaoaili@kingsoft.com>
Cc: Sean Christopherson <seanjc@google.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Message-Id: <1643112538-36743-1-git-send-email-wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-05-12 12:23:48 +02:00
arch KVM: LAPIC: Enable timer posted-interrupt only when mwait/hlt is advertised 2022-05-12 12:23:48 +02:00
block block/compat_ioctl: fix range check in BLKGETSIZE 2022-04-27 13:50:50 +02:00
certs certs: Trigger creation of RSA module signing key if it's not an RSA key 2021-09-15 09:47:29 +02:00
crypto crypto: authenc - Fix sleep in atomic context in decrypt_tail 2022-04-15 14:18:04 +02:00
Documentation ext4, doc: fix incorrect h_reserved size 2022-04-27 13:50:50 +02:00
drivers drm/amdkfd: Use drm_priv to pass VM from KFD to amdgpu 2022-05-12 12:23:47 +02:00
fs NFSv4: Don't invalidate inode attributes on delegation return 2022-05-12 12:23:47 +02:00
include mm, hugetlb: allow for "high" userspace addresses 2022-05-09 09:03:28 +02:00
init init/main.c: return 1 from handled __setup() functions 2022-04-15 14:18:35 +02:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-12-01 09:23:35 +01:00
kernel genirq: Synchronize interrupt thread startup 2022-05-12 12:23:41 +02:00
lib hex2bin: fix access beyond string end 2022-05-09 09:03:22 +02:00
LICENSES
mm mm, hugetlb: allow for "high" userspace addresses 2022-05-09 09:03:28 +02:00
net net: igmp: respect RCU rules in ip_mc_source() and ip_mc_msfilter() 2022-05-12 12:23:46 +02:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-17 09:48:39 +01:00
scripts gcc-plugins: latent_entropy: use /dev/urandom 2022-04-20 09:19:38 +02:00
security Fix incorrect type in assignment of ipv6 port for audit 2022-04-15 14:18:22 +02:00
sound ASoC: dmaengine: Restore NULL prepare_slave_config() callback 2022-05-12 12:23:44 +02:00
tools selftests: mirror_gre_bridge_1q: Avoid changing PVID while interface is operational 2022-05-12 12:23:46 +02:00
usr
virt KVM: Prevent module exit until all VMs are freed 2022-04-15 14:18:27 +02:00
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Makefile Linux 5.4.192 2022-05-09 09:03:28 +02:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.