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DIR:OUT; SFP:1101; SCL:1; SRVR:DM6PR12MB2907; H:DM6PR12MB2682.namprd12.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; MX:1; A:1; received-spf: None (protection.outlook.com: amd.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: brQEv9LUFoYSOlzWpl3hYIQjBh78chXdupB4Fh2XSspzuBSAK6odfTF8LQsKef9vLR6a1aW3+s/ryjR7kPT4d+IsmR1AboV/qqzVVEFpp51rPPQmUvJpR9KHmX5U5UsrYjjh7jDPj4oluPEzzEAes6TWbdet0RjstVDcPPY8a1twK97pZaHgfSdybdxoM42kjUG+T+BW+uaBvYshqTQj8cddZr7cxWTjuMBhltDIj88h5M7h9XSHoF4RbRPa2WxV1RK7dWRZ+kop83mvyzKflXqzgbrLR/emQKuOJPvglJdxJ8aE3WIZ/ntPEA378+N5GAc4k5vRDAtPMcIVxWyJ2Q8qMCX3DvZfLMYtHhHcR8u4DpKeo7Hju0/TVcFV7CsLCBpL9iwDORc6UZ9nQyP/NbsXTEfEh7PZApOLT+sM97A= Content-ID: <6C26546F6C64B3438A26C98CB0F1C566@namprd12.prod.outlook.com> MIME-Version: 1.0 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: ded7b687-5cb4-47b4-3c89-08d6c8cf51a0 X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Apr 2019 16:10:07.6157 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB2907 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 40.107.78.88 Subject: [Qemu-devel] [RFC PATCH v1 07/10] KVM: x86: Add AMD SEV specific Hypercall3 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Lendacky, Thomas" , "Singh, Brijesh" , =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= , Joerg Roedel , "x86@kernel.org" , "qemu-devel@nongnu.org" , "linux-kernel@vger.kernel.org" , Ingo Molnar , "H. Peter Anvin" , Paolo Bonzini , Thomas Gleixner , Borislav Petkov Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" KVM hypercall framework relies on alternative framework to patch the VMCALL -> VMMCALL on AMD platform. If a hypercall is made before apply_alternative() is called then it defaults to VMCALL. The approach works fine on non SEV guest. A VMCALL would causes #UD, and hypervisor will be able to decode the instruction and do the right things. But when SEV is active, guest memory is encrypted with guest key and hypervisor will not be able to decode the instruction bytes. Add SEV specific hypercall3, it unconditionally uses VMMCALL. The hypercall will be used by the SEV guest to notify encrypted pages to the hypervisor. Cc: Thomas Gleixner Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Joerg Roedel Cc: Borislav Petkov Cc: Tom Lendacky Cc: x86@kernel.org Cc: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Brijesh Singh --- arch/x86/include/asm/kvm_para.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h index 5ed3cf1c3934..94e91c0bc2e0 100644 --- a/arch/x86/include/asm/kvm_para.h +++ b/arch/x86/include/asm/kvm_para.h @@ -84,6 +84,18 @@ static inline long kvm_hypercall4(unsigned int nr, unsigned long p1, return ret; } +static inline long kvm_sev_hypercall3(unsigned int nr, unsigned long p1, + unsigned long p2, unsigned long p3) +{ + long ret; + + asm volatile("vmmcall" + : "=a"(ret) + : "a"(nr), "b"(p1), "c"(p2), "d"(p3) + : "memory"); + return ret; +} + #ifdef CONFIG_KVM_GUEST bool kvm_para_available(void); unsigned int kvm_arch_para_features(void);