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Mon, 3 Jun 2024 07:13:59 -0400 (EDT) (envelope-from sakib@darkstar.site) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 6235b457-219a-11ef-b4bb-af5377834399 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed; d=pobox.com; h=from:to:cc :subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; s=sasl; bh=Z5+rlrFJma8dHA+2EwttZvn1p HBH3Y8OD11pFDMz7uM=; b=ZwfXE+GKfiW/cqvlAy9rG4L2Sp7zddb9G/HLsxVgH MQU1KWc2I54tdUx8TPwdw52cLIsnByBmEmpRvecl+kD0/w9fYvZVCQieN0ADNqV/ AYsEoDXmGDzptKxY74OYX3SEkuCRePDu1svT45awUhdTsubIoBjIMBJ9AvpOcc5T yY= From: Sergiy Kibrik To: xen-devel@lists.xenproject.org Cc: Sergiy Kibrik , Andrew Cooper , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , George Dunlap , Jan Beulich , Stefano Stabellini , Xenia Ragiadakou , Tamas K Lengyel Subject: [XEN PATCH v3 04/16] x86: introduce CONFIG_ALTP2M Kconfig option Date: Mon, 3 Jun 2024 14:13:55 +0300 Message-Id: <035f63f2b92b963f2585064fa21e09e73157f9d3.1717410850.git.Sergiy_Kibrik@epam.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 X-Pobox-Relay-ID: 601F0EDE-219A-11EF-A03A-8F8B087618E4-90055647!pb-smtp21.pobox.com Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @pobox.com) X-ZM-MESSAGEID: 1717413264670100001 Content-Type: text/plain; charset="utf-8" Add new option to make altp2m code inclusion optional. Currently altp2m implemented for Intel EPT only, so option is dependant on = VMX. Also the prompt itself depends on EXPERT=3Dy, so that option is available for fine-tuning, if one want to play around with it. Use this option instead of more generic CONFIG_HVM option. That implies the possibility to build hvm code without altp2m support, hence we need to declare altp2m routines for hvm code to compile successful= ly (altp2m_vcpu_initialise(), altp2m_vcpu_destroy(), altp2m_vcpu_enable_ve()) Also guard altp2m routines, so that they can be disabled completely in the build -- when target platform does not actually support altp2m (AMD-V & ARM as of now). Signed-off-by: Sergiy Kibrik CC: Tamas K Lengyel CC: Jan Beulich CC: Stefano Stabellini --- changes in v3: - added help text - use conditional prompt depending on EXPERT=3Dy - corrected & extended patch description - put a blank line before #ifdef CONFIG_ALTP2M - sqashed in a separate patch for guarding altp2m code with CONFIG_ALTP2M = option changes in v2: - use separate CONFIG_ALTP2M option instead of CONFIG_VMX --- xen/arch/x86/Kconfig | 11 +++++++++++ xen/arch/x86/include/asm/altp2m.h | 5 ++++- xen/arch/x86/include/asm/hvm/hvm.h | 2 +- xen/arch/x86/include/asm/p2m.h | 17 ++++++++++++++++- xen/arch/x86/mm/Makefile | 2 +- 5 files changed, 33 insertions(+), 4 deletions(-) diff --git a/xen/arch/x86/Kconfig b/xen/arch/x86/Kconfig index 8c9f8431f0..4a35c43dc5 100644 --- a/xen/arch/x86/Kconfig +++ b/xen/arch/x86/Kconfig @@ -358,6 +358,17 @@ config REQUIRE_NX was unavailable. However, if enabled, Xen will no longer boot on any CPU which is lacking NX support. =20 +config ALTP2M + bool "Alternate P2M support" if EXPERT + default y + depends on VMX + help + Alternate-p2m allows a guest to manage multiple p2m guest physical + "memory views" (as opposed to a single p2m). + Useful for memory introspection. + + If unsure, stay with defaults. + endmenu =20 source "common/Kconfig" diff --git a/xen/arch/x86/include/asm/altp2m.h b/xen/arch/x86/include/asm/a= ltp2m.h index 2d36c5aa9b..effbef51eb 100644 --- a/xen/arch/x86/include/asm/altp2m.h +++ b/xen/arch/x86/include/asm/altp2m.h @@ -7,7 +7,7 @@ #ifndef __ASM_X86_ALTP2M_H #define __ASM_X86_ALTP2M_H =20 -#ifdef CONFIG_HVM +#ifdef CONFIG_ALTP2M =20 #include #include /* for struct vcpu, struct domain */ @@ -34,6 +34,9 @@ static inline bool altp2m_active(const struct domain *d) } =20 /* Only declaration is needed. DCE will optimise it out when linking. */ +void altp2m_vcpu_initialise(struct vcpu *v); +void altp2m_vcpu_destroy(struct vcpu *v); +int altp2m_vcpu_enable_ve(struct vcpu *v, gfn_t gfn); void altp2m_vcpu_disable_ve(struct vcpu *v); =20 #endif diff --git a/xen/arch/x86/include/asm/hvm/hvm.h b/xen/arch/x86/include/asm/= hvm/hvm.h index 1c01e22c8e..2ebea1a92c 100644 --- a/xen/arch/x86/include/asm/hvm/hvm.h +++ b/xen/arch/x86/include/asm/hvm/hvm.h @@ -670,7 +670,7 @@ static inline bool hvm_hap_supported(void) /* returns true if hardware supports alternate p2m's */ static inline bool hvm_altp2m_supported(void) { - return hvm_funcs.caps.altp2m; + return IS_ENABLED(CONFIG_ALTP2M) && hvm_funcs.caps.altp2m; } =20 /* Returns true if we have the minimum hardware requirements for nested vi= rt */ diff --git a/xen/arch/x86/include/asm/p2m.h b/xen/arch/x86/include/asm/p2m.h index c1478ffc36..b247aa4c7d 100644 --- a/xen/arch/x86/include/asm/p2m.h +++ b/xen/arch/x86/include/asm/p2m.h @@ -577,10 +577,10 @@ static inline gfn_t mfn_to_gfn(const struct domain *d= , mfn_t mfn) return _gfn(mfn_x(mfn)); } =20 -#ifdef CONFIG_HVM #define AP2MGET_prepopulate true #define AP2MGET_query false =20 +#ifdef CONFIG_ALTP2M /* * Looks up altp2m entry. If the entry is not found it looks up the entry = in * hostp2m. @@ -589,6 +589,15 @@ static inline gfn_t mfn_to_gfn(const struct domain *d,= mfn_t mfn) int altp2m_get_effective_entry(struct p2m_domain *ap2m, gfn_t gfn, mfn_t *= mfn, p2m_type_t *t, p2m_access_t *a, bool prepopulate); +#else +static inline int altp2m_get_effective_entry(struct p2m_domain *ap2m, + gfn_t gfn, mfn_t *mfn, + p2m_type_t *t, p2m_access_t *= a, + bool prepopulate) +{ + ASSERT_UNREACHABLE(); + return -EOPNOTSUPP; +} #endif =20 /* Init the datastructures for later use by the p2m code */ @@ -914,8 +923,14 @@ static inline bool p2m_set_altp2m(struct vcpu *v, unsi= gned int idx) /* Switch alternate p2m for a single vcpu */ bool p2m_switch_vcpu_altp2m_by_id(struct vcpu *v, unsigned int idx); =20 +#ifdef CONFIG_ALTP2M /* Check to see if vcpu should be switched to a different p2m. */ void p2m_altp2m_check(struct vcpu *v, uint16_t idx); +#else +static inline void p2m_altp2m_check(struct vcpu *v, uint16_t idx) +{ +} +#endif =20 /* Flush all the alternate p2m's for a domain */ void p2m_flush_altp2m(struct domain *d); diff --git a/xen/arch/x86/mm/Makefile b/xen/arch/x86/mm/Makefile index 0128ca7ab6..d7d57b8190 100644 --- a/xen/arch/x86/mm/Makefile +++ b/xen/arch/x86/mm/Makefile @@ -1,7 +1,7 @@ obj-y +=3D shadow/ obj-$(CONFIG_HVM) +=3D hap/ =20 -obj-$(CONFIG_HVM) +=3D altp2m.o +obj-$(CONFIG_ALTP2M) +=3D altp2m.o obj-$(CONFIG_HVM) +=3D guest_walk_2.o guest_walk_3.o guest_walk_4.o obj-$(CONFIG_SHADOW_PAGING) +=3D guest_walk_4.o obj-$(CONFIG_MEM_ACCESS) +=3D mem_access.o --=20 2.25.1