On 2018-04-11 15:16, f...@ozog.com wrote:
> inmates cannot use X86_FEATURE_VMX from regular cpuid
> as vcpu maks the bit explicitely on non-root cells.
>
> use cpuid leaf 0 to detect AuthenticAMD and change to VMMCALL
>
> Signed-off-by: Francois-Frederic Ozog <f...@ozog.com>
> ---
> inmates/lib/x86/hypercall.c | 12 ++++++------
> 1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/inmates/lib/x86/hypercall.c b/inmates/lib/x86/hypercall.c
> index ac99f0c3..2d7a96e1 100644
> --- a/inmates/lib/x86/hypercall.c
> +++ b/inmates/lib/x86/hypercall.c
> @@ -40,19 +40,19 @@
>
> #define X86_FEATURE_VMX (1 << 5)
>
> -bool jailhouse_use_vmcall;
> +bool jailhouse_use_vmcall = true;
>
> void hypercall_init(void)
> {
> - u32 eax = 1, ecx = 0;
> + u32 eax = 0, ebx = 0, ecx = 0, edx = 0;
>
> asm volatile(
> "cpuid"
> : "=c" (ecx)
> - : "a" (eax), "c" (ecx)
> - : "rbx", "rdx", "memory"
> + : "a" (eax), "b" (ebx), "c" (ecx), "d" (edx)
> + : "memory"
> );
>
> - if (ecx & X86_FEATURE_VMX)
> - jailhouse_use_vmcall = true;
> + if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746E65)
> + jailhouse_use_vmcall = false;
> }
> --
> 2.11.0
>
This patch looks functionally fine now, but your mailer replaces tabs
with spaces. Please fix and resend.
Jan
--
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux
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