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| author |   Rusty Russell <rusty@rustcorp.com.au> | 2015-02-11 15:15:09 +1030 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2015-02-11 16:47:29 +1030 |
| commit | 18c137371b2ea86d263b75665a4904a0b8872990 (patch) | |
| tree | 59f8e6bf9b43195b8d9d77fb3235468baeb8d946 /drivers/lguest/core.c | |
| parent | lguest: have --rng read from /dev/urandom not /dev/random. (diff) | |
| download | linux-dev-18c137371b2ea86d263b75665a4904a0b8872990.tar.xz linux-dev-18c137371b2ea86d263b75665a4904a0b8872990.zip | |
lguest: add operations to get/set a register from the Launcher.
We use the ptrace API struct, and we currently don't let them set
anything but the normal registers (we'd have to filter the others).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/lguest/core.c')
| -rw-r--r-- | drivers/lguest/core.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c index 6590558d1d31..cdb2f9aa5860 100644 --- a/drivers/lguest/core.c +++ b/drivers/lguest/core.c @@ -208,6 +208,14 @@ void __lgwrite(struct lg_cpu *cpu, unsigned long addr, const void *b, */ int run_guest(struct lg_cpu *cpu, unsigned long __user *user) { + /* If the launcher asked for a register with LHREQ_GETREG */ + if (cpu->reg_read) { + if (put_user(*cpu->reg_read, user)) + return -EFAULT; + cpu->reg_read = NULL; + return sizeof(*cpu->reg_read); + } + /* We stop running once the Guest is dead. */ while (!cpu->lg->dead) { unsigned int irq; |