Revision - ac8d6ca - KVM: x86: Only do MSR filtering when access MSR by rdmsr/wrmsr - origin: https://github.com/torvalds/linux

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16 September 2024, 20:19:31 UTC

Revision ac8d6cad3c7b39633d5899dc2fa9abec7135e83e authored by Hou Wenlong on 07 March 2022, 12:26:33 UTC, committed by Paolo Bonzini on 02 April 2022, 09:34:47 UTC

KVM: x86: Only do MSR filtering when access MSR by rdmsr/wrmsr

If MSR access is rejected by MSR filtering,
kvm_set_msr()/kvm_get_msr() would return KVM_MSR_RET_FILTERED,
and the return value is only handled well for rdmsr/wrmsr.
However, some instruction emulation and state transition also
use kvm_set_msr()/kvm_get_msr() to do msr access but may trigger
some unexpected results if MSR access is rejected, E.g. RDPID
emulation would inject a #UD but RDPID wouldn't cause a exit
when RDPID is supported in hardware and ENABLE_RDTSCP is set.
And it would also cause failure when load MSR at nested entry/exit.
Since msr filtering is based on MSR bitmap, it is better to only
do MSR filtering for rdmsr/wrmsr.

Signed-off-by: Hou Wenlong <houwenlong.hwl@antgroup.com>
Message-Id: <2b2774154f7532c96a6f04d71c82a8bec7d9e80b.1646655860.git.houwenlong.hwl@antgroup.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Tip revision: ac8d6cad3c7b39633d5899dc2fa9abec7135e83e authored by Hou Wenlong on 07 March 2022, 12:26:33 UTC
KVM: x86: Only do MSR filtering when access MSR by rdmsr/wrmsr

Tip revision: ac8d6ca

File	Mode	Size
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arch
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certs
crypto
drivers
fs
include
init
ipc
kernel
lib
mm
net
samples
scripts
security
sound
tools
usr
virt
.clang-format	-rw-r--r--	16.6 KB
.cocciconfig	-rw-r--r--	59 bytes
.get_maintainer.ignore	-rw-r--r--	71 bytes
.gitattributes	-rw-r--r--	62 bytes
.gitignore	-rw-r--r--	1.9 KB
.mailmap	-rw-r--r--	21.5 KB
COPYING	-rw-r--r--	496 bytes
CREDITS	-rw-r--r--	98.8 KB
Kbuild	-rw-r--r--	1.3 KB
Kconfig	-rw-r--r--	555 bytes
MAINTAINERS	-rw-r--r--	626.0 KB
Makefile	-rw-r--r--	63.5 KB
README	-rw-r--r--	727 bytes

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KVM: x86: Only do MSR filtering when access MSR by rdmsr/wrmsr

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