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| author |   Ryan Grimm <grimm@linux.vnet.ibm.com> | 2019-08-19 23:13:21 -0300 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-08-30 09:55:41 +1000 |
| commit | 734560ac39aeb2516419c5878856df011f794a74 (patch) | |
| tree | e1a92b157035854c3787daf73e71e302bc60efda /Documentation/ABI/testing/sysfs-devices-system-cpu | |
| parent | powerpc/pseries/svm: Unshare all pages before kexecing a new kernel (diff) | |
| download | linux-dev-734560ac39aeb2516419c5878856df011f794a74.tar.xz linux-dev-734560ac39aeb2516419c5878856df011f794a74.zip | |
powerpc/pseries/svm: Export guest SVM status to user space via sysfs
User space might want to know it's running in a secure VM. It can't do
a mfmsr because mfmsr is a privileged instruction.
The solution here is to create a cpu attribute:
/sys/devices/system/cpu/svm
which will read 0 or 1 based on the S bit of the current CPU.
Signed-off-by: Ryan Grimm <grimm@linux.vnet.ibm.com>
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190820021326.6884-12-bauerman@linux.ibm.com
Diffstat (limited to 'Documentation/ABI/testing/sysfs-devices-system-cpu')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-devices-system-cpu | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu index 5f7d7b14fa44..06d0931119cc 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -562,3 +562,13 @@ Description: Umwait control or C0.2 state. The time is an unsigned 32-bit number. Note that a value of zero means there is no limit. Low order two bits must be zero. + +What: /sys/devices/system/cpu/svm +Date: August 2019 +Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> + Linux for PowerPC mailing list <linuxppc-dev@ozlabs.org> +Description: Secure Virtual Machine + + If 1, it means the system is using the Protected Execution + Facility in POWER9 and newer processors. i.e., it is a Secure + Virtual Machine. |