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Wed, 28 Oct 2020 12:35:47 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AB953A4057; Wed, 28 Oct 2020 12:35:45 +0000 (GMT) Received: from srikart450.in.ibm.com (unknown [9.79.210.102]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 28 Oct 2020 12:35:45 +0000 (GMT) From: Srikar Dronamraju To: Michael Ellerman Cc: linuxppc-dev , Srikar Dronamraju , LKML , Nicholas Piggin , Nathan Lynch , Gautham R Shenoy , Peter Zijlstra , Valentin Schneider , Juri Lelli , Waiman Long , Phil Auld Subject: [PATCH 3/4] powerpc: Reintroduce is_kvm_guest in a new avatar Date: Wed, 28 Oct 2020 18:05:11 +0530 Message-Id: <20201028123512.871051-4-srikar@linux.vnet.ibm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201028123512.871051-1-srikar@linux.vnet.ibm.com> References: <20201028123512.871051-1-srikar@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312,18.0.737 definitions=2020-10-28_06:2020-10-26,2020-10-28 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 mlxscore=0 suspectscore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 priorityscore=1501 malwarescore=0 phishscore=0 mlxlogscore=917 adultscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2010280083 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce a static branch that would be set during boot if the OS happens to be a KVM guest. Subsequent checks to see if we are on KVM will rely on this static branch. This static branch would be used in vcpu_is_preempted in a subsequent patch. Signed-off-by: Srikar Dronamraju Cc: linuxppc-dev Cc: LKML Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Nathan Lynch Cc: Gautham R Shenoy Cc: Peter Zijlstra Cc: Valentin Schneider Cc: Juri Lelli Cc: Waiman Long Cc: Phil Auld --- arch/powerpc/include/asm/kvm_guest.h | 10 ++++++++++ arch/powerpc/include/asm/kvm_para.h | 2 +- arch/powerpc/kernel/firmware.c | 3 +++ 3 files changed, 14 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/kvm_guest.h b/arch/powerpc/include/asm/kvm_guest.h index ba8291e02ba9..627ba272e781 100644 --- a/arch/powerpc/include/asm/kvm_guest.h +++ b/arch/powerpc/include/asm/kvm_guest.h @@ -7,8 +7,18 @@ #define __POWERPC_KVM_GUEST_H__ #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_KVM_GUEST) +#include + +DECLARE_STATIC_KEY_FALSE(kvm_guest); + +static inline bool is_kvm_guest(void) +{ + return static_branch_unlikely(&kvm_guest); +} + bool check_kvm_guest(void); #else +static inline bool is_kvm_guest(void) { return false; } static inline bool check_kvm_guest(void) { return false; } #endif diff --git a/arch/powerpc/include/asm/kvm_para.h b/arch/powerpc/include/asm/kvm_para.h index 6fba06b6cfdb..abe1b5e82547 100644 --- a/arch/powerpc/include/asm/kvm_para.h +++ b/arch/powerpc/include/asm/kvm_para.h @@ -14,7 +14,7 @@ static inline int kvm_para_available(void) { - return IS_ENABLED(CONFIG_KVM_GUEST) && check_kvm_guest(); + return IS_ENABLED(CONFIG_KVM_GUEST) && is_kvm_guest(); } static inline unsigned int kvm_arch_para_features(void) diff --git a/arch/powerpc/kernel/firmware.c b/arch/powerpc/kernel/firmware.c index 61243267d4cf..28498fc573f2 100644 --- a/arch/powerpc/kernel/firmware.c +++ b/arch/powerpc/kernel/firmware.c @@ -14,6 +14,7 @@ #include #include +#include #ifdef CONFIG_PPC64 unsigned long powerpc_firmware_features __read_mostly; @@ -21,6 +22,7 @@ EXPORT_SYMBOL_GPL(powerpc_firmware_features); #endif #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_KVM_GUEST) +DEFINE_STATIC_KEY_FALSE(kvm_guest); bool check_kvm_guest(void) { struct device_node *hyper_node; @@ -32,6 +34,7 @@ bool check_kvm_guest(void) if (!of_device_is_compatible(hyper_node, "linux,kvm")) return 0; + static_branch_enable(&kvm_guest); return 1; } #endif -- 2.18.4