Evolution-X-Tensor/device_google_gs101
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Enable pkvm based on the relevant sysprop rather than /dev/kvm

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1. This is simpler, as it can be triggered by logic in the init.rc
2. The old method of probing /dev/kvm fails if non-protected kvm
   is enabled: the device will exist, but pkvm is not enable

Bug: 346525496
Test: observe that pkvm is enabled after double reboot
Change-Id: I2f557ed56f13458a288ede34e672692b511b6bc9
This commit is contained in:
Keir Fraser 2024-06-12 12:18:48 +00:00
parent f34142e084
commit 4ff69cacdf
2 changed files with 7 additions and 18 deletions
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18
pkvm/pkvm_enabler.c
View file

@ -24,7 +24,6 @@
#include <log/log.h>
#define KVM_DEVICE "/dev/kvm"
#define MISC_WRITER "/vendor/bin/misc_writer"
int main() {
@ -33,22 +32,7 @@ int main() {
pid_t pid;
int ret, wstatus;
/* Check whether KVM device exists. */
ret = access(KVM_DEVICE, F_OK);
/* If KVM device exists, return SUCCESS to continue booting. */
if (ret == 0) {
exit(EXIT_SUCCESS);
}
if (ret != -ENOENT) {
ALOGW("Unexpected error from access(): %d", ret);
}
/*
* If KVM device does not exist, run misc_writer and return FAILURE
* to force a reboot.
*/
/* Run misc_writer and return FAILURE to force a reboot. */
pid = fork();
if (pid == -1) {
ALOGE("Could not fork: %d", errno);

7
pkvm/pkvm_enabler.gs101.rc
View file

@ -2,5 +2,10 @@ service pkvm_enabler /vendor/bin/pkvm_enabler
reboot_on_failure reboot,pkvm-not-enabled
user root
on early-init
# Old bootloaders do not set the protected_vm sysprop when pkvm is disabled
on early-init && property:ro.boot.hypervisor.protected_vm.supported=
exec_start pkvm_enabler
# New bootloaders set the protected_vm sysprop to 0 when pkvm is disabled
on early-init && property:ro.boot.hypervisor.protected_vm.supported=0
exec_start pkvm_enabler