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Re: [Qemu-devel] [PATCH v3 11/13] tests: acpi: add simple arm/virt testc
From: |
Igor Mammedov |
Subject: |
Re: [Qemu-devel] [PATCH v3 11/13] tests: acpi: add simple arm/virt testcase |
Date: |
Thu, 2 May 2019 16:24:20 +0200 |
On Fri, 26 Apr 2019 17:28:10 +0100
Wei Xu <address@hidden> wrote:
> Hi Igor,
>
> On 4/26/2019 12:54 PM, Igor Mammedov wrote:
> > On Fri, 26 Apr 2019 00:51:56 +0800
> > x00249684 <address@hidden> wrote:
> >
> >> Hi Igor,
> >>
> >> +static void test_acpi_virt_tcg(void)
> >> +{
> >> + test_data data = {
> >> + .machine = "virt",
> >> + .uefi_fl1 = "pc-bios/edk2-aarch64-code.fd",
> >> + .uefi_fl2 = "pc-bios/edk2-arm-vars.fd",
> >> + .cd =
> >> "tests/data/uefi-boot-images/bios-tables-test.aarch64.iso.qcow2",
> >> + .ram_start = 0x40000000ULL,
> >> + .scan_len = 128ULL * 1024 * 1024,
> >> + };
> >> +
> >> + test_acpi_one("-cpu cortex-a57 ", &data);
> >>
> >> Replaced the cortex-a57 with host and succesfully tested on the hisilicon
> >> arm64
> >> D05 board. Otherwise it failed with "kvm_init_vcpu failed: Invalid
> >> argument".
> >> Is it possilbe to set the cpu type like numa-test.c?
> >
> > I think it works with numa-test because it uses TCG only but in case of
> > bios-tables-test
> > it uses accel="kvm:tcg" to leverage KVM capabilities whenever possible to
> > speed up test.
> >
> > Now back to our ARM test case, uefi requirement is to use 64bit CPU (hence
> > it was cortex-a57)
> > however unlike x86 it obviously breaks since KVM accelerator on ARM host is
> > used
> > and it doesn't work with anything other than 'host' cpu model.
> >
> > I think we still want to use KVM whenever possible, but problem lies in that
> > user (testcase) doesn't have an idea if KVM accelerator is available and
> > host is 64 CPU.
> >
> > to sum up we need to support 2 modes:
> > 1. host is 64 ARM, use kvm with -cpu host
> > 2. all other cases use tcg with -cpu cortex-a57
> >
> > I can hack to probe if /dev/kvm is accessible and host is 64 bit and use #1
> > otherwise fallback to #2
> > or as quick fix do only #2 initially and think about a better solution to
> > #1
>
> Thanks!
> Fine to me.
>
> >
> > Is there any other suggestions/opinions how to approach issue/proceed.
>
> To check the host cpu architecture is ARM or not, maybe we can check the value
> of "CPU implementer" is 0x41 or not from the /proc/cpuinfo.
it turned out it's more complicated.
we also should pick a correct GIC depending on host's CPU and that
changes ACPI tables, so it will worn on some hosts and fail on other.
I'll add a patch to enable test case to pick accelerator and force TCG
for ARM tests for now.
>
> Best Regards,
> Wei
>
> >
> > PS:
> > we probably would like to reuse this not only for acpi tests but also for
> > other
> > arm/virt test cases that involve running guest code.
> >
> >> Thanks!
> >>
> >> Best Regards,
> >> Wei
> >
> >
> > .
> >
>
- Re: [Qemu-devel] [PATCH v3 11/13] tests: acpi: add simple arm/virt testcase,
Igor Mammedov <=