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Re: [Qemu-devel] [PATCH] hw/mips: malta: Don't boot from flash with KVM
From: |
Andreas Färber |
Subject: |
Re: [Qemu-devel] [PATCH] hw/mips: malta: Don't boot from flash with KVM T&E |
Date: |
Fri, 20 Jun 2014 15:17:42 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 |
Hi,
Am 20.06.2014 13:47, schrieb James Hogan:
> In KVM trap & emulate (T&E) mode the flash reset region at 0xbfc00000
> isn't executable, which is why the minimal kernel bootloader is loaded
> and executed from the last 1MB of DRAM instead.
>
> Therefore if no kernel is provided on the command line and KVM is
> enabled, exit with an error since booting from flash will fail.
>
> Reported-by: Aurelien Jarno <address@hidden>
> Signed-off-by: James Hogan <address@hidden>
> Cc: Paolo Bonzini <address@hidden>
> ---
> hw/mips/mips_malta.c | 6 ++++++
> 1 file changed, 6 insertions(+)
Previous commits have used just "mips_malta:", so suggest to do the same
for consistency - or clean hw/mips/ dir up by renaming the file to just
malta.c and use "mips/malta:".
http://git.qemu-project.org/?p=qemu.git;a=history;f=hw/mips/mips_malta.c;h=f4a7d47129526f6762eccc47251c8cf3cd27f928;hb=HEAD
That said,
> diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
> index 8bc5392b4223..91b0ce566111 100644
> --- a/hw/mips/mips_malta.c
> +++ b/hw/mips/mips_malta.c
> @@ -1052,6 +1052,12 @@ void mips_malta_init(MachineState *machine)
> bootloader_run_addr, kernel_entry);
> }
> } else {
> + /* The flash region isn't executable from a KVM T&E guest */
> + if (kvm_enabled()) {
> + error_report("KVM enabled but no -kernel argument was specified.
> "
> + "Booting from flash is not supported with KVM
> T&E.");
> + exit(1);
> + }
> /* Load firmware from flash. */
> if (!dinfo) {
> /* Load a BIOS image. */
Reviewed-by: Andreas Färber <address@hidden>
Are users expected to know/understand "KVM T&E"? You don't test for that
T&E mode here, so you could either shorten the message to just "KVM" or
replace the check with a more specific one.
Since qtest does not use KVM on MIPS today, exiting without -kernel
should be fine, but may need updating if we ever get to that.
Regards,
Andreas
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