Huang Ying wrote:
I find there is already a function named qemu_ram_addr_from_host which
translate from user space virtual address into qemu RAM address. But I
need function to return a error code instead of abort in case of no RAM
address corresponding specified user space virtual address. So I plan to
use following code to deal with that.
int do_qemu_ram_addr_from_host(void *ptr, ram_addr_t *ram_addr);
ram_addr_t qemu_ram_addr_from_host(void *ptr);
Does this follow the coding style of qemu?
I don't like the do_ prefix much but I don't have a better suggestion.
If the instruction gets skipped, we may be leaking host memory because
the access never happened.
There are two kinds of recoverable MCE named SRAO (Software Recoverable
Action Optional) and SRAR (Software Recoverable Action Required). For
your example, it is a SRAR error. Where kernel will munmap the error
page and send SIGBUS to qemu via force_sig_info, which will unblock
SIGBUS and reset its action to SIG_DFL, so qemu will be terminated.
If the guest mode is interrupted, because signal mask processing of KVM
kernel part, SIGBUS can be captured by qemu.
Ah, I didn't realize this path just worked.
--
Regards,
Anthony Liguori
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