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From: | Brijesh Singh |
Subject: | Re: [Qemu-devel] [RFC PATCH v1 17/22] target-i386: add cpuid Fn8000_001f |
Date: | Wed, 21 Sep 2016 11:20:59 -0500 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 |
Hi Paolo, On 09/13/2016 06:07 PM, Paolo Bonzini wrote:
On 13/09/2016 16:49, Brijesh Singh wrote:Fn8000_001f cpuid provides the memory encryption (aka C-bit) Signed-off-by: Brijesh Singh <address@hidden> --- target-i386/cpu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/target-i386/cpu.c b/target-i386/cpu.c index 6a1afab..e039c08 100644 --- a/target-i386/cpu.c +++ b/target-i386/cpu.c @@ -2625,6 +2625,9 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, *edx = 0; } break; + case 0x8000001F: + host_cpuid(index, 0, eax, ebx, ecx, edx); + break; case 0xC0000000: *eax = env->cpuid_xlevel2; *ebx = 0;This should only be visible to a SEV-enabled guest. Also, the xlevel should be bumped to 0x8000001F for SEV-enabled guests.
Okay I will add sev_enabled() check before getting the cpuid.Regarding xlevel, I am not able to locate qemu code which bumped the xelevel for KVM enabled guests. Maybe I am missing something, looking at code gave me impression that xlevel is obtained using CPUID_80000000. One of the KVM RFC patch [1] updates the min level. Do I need to do something more into qemu to bumped the xlevel?
http://marc.info/?l=linux-mm&m=147190934724195&w=2
Paolo
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