From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brijesh Singh Subject: [PATCH v10 25/28] cpu/i386: populate CPUID 0x8000_001F when SEV is active Date: Wed, 28 Feb 2018 15:10:25 -0600 Message-ID: <20180228211028.83970-26-brijesh.singh@amd.com> References: <20180228211028.83970-1-brijesh.singh@amd.com> Mime-Version: 1.0 Content-Type: text/plain Cc: Peter Maydell , Brijesh Singh , kvm@vger.kernel.org, "Michael S. Tsirkin" , Stefan Hajnoczi , Alexander Graf , "Edgar E. Iglesias" , Markus Armbruster , Bruce Rogers , Christian Borntraeger , Marcel Apfelbaum , Borislav Petkov , Thomas Lendacky , Eduardo Habkost , Richard Henderson , "Dr. David Alan Gilbert" , Alistair Francis , Cornelia Huck , Richard Henderson , Peter Crosthwaite , Paolo Bonzini To: qemu-devel@nongnu.org Return-path: In-Reply-To: <20180228211028.83970-1-brijesh.singh@amd.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+gceq-qemu-devel2=m.gmane.org@nongnu.org Sender: "Qemu-devel" List-Id: kvm.vger.kernel.org When SEV is enabled, CPUID 0x8000_001F should provide additional information regarding the feature (such as which page table bit is used to mark the pages as encrypted etc). The details for memory encryption CPUID is available in AMD APM (https://support.amd.com/TechDocs/24594.pdf) Section E.4.17 Cc: Paolo Bonzini Cc: Richard Henderson Cc: Eduardo Habkost Signed-off-by: Brijesh Singh --- target/i386/cpu.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index b5e431e769da..7a3cec59402b 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -26,6 +26,7 @@ #include "sysemu/hvf.h" #include "sysemu/cpus.h" #include "kvm_i386.h" +#include "sev_i386.h" #include "qemu/error-report.h" #include "qemu/option.h" @@ -3612,6 +3613,13 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, *ecx = 0; *edx = 0; break; + case 0x8000001F: + *eax = sev_enabled() ? 0x2 : 0; + *ebx = sev_get_cbit_position(); + *ebx |= sev_get_reduced_phys_bits() << 6; + *ecx = 0; + *edx = 0; + break; default: /* reserved values: zero */ *eax = 0; @@ -4041,6 +4049,11 @@ static void x86_cpu_expand_features(X86CPU *cpu, Error **errp) if (env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_SVM) { x86_cpu_adjust_level(cpu, &env->cpuid_min_xlevel, 0x8000000A); } + + /* SEV requires CPUID[0x8000001F] */ + if (sev_enabled()) { + x86_cpu_adjust_level(cpu, &env->cpuid_min_xlevel, 0x8000001F); + } } /* Set cpuid_*level* based on cpuid_min_*level, if not explicitly set */ -- 2.14.3