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client-ip=162.221.158.21; receiver=esa2.hc3370-68.iphmx.com; envelope-from="roger.pau@citrix.com"; x-sender="postmaster@mail.citrix.com"; x-conformance=sidf_compatible IronPort-SDR: pzf3WItOrVYWiQT41cnOg2kLdT9S61GmKbgIs2KSP0CPNmXKMu07kXJaa/DhDs4JVba4U97bsG sPZAt8hWJsKHeOlK7/ZicAJKQExIWZjaAxNfZ0jY5fZJq1kH9sVcij64OpwkftUq/xgNzZX55o u4g0eAtRp7FWCID197c7pY+I1Hkf7EFhQW8dM0LBaJSYD781Px+duizO2eg75M0xoNuPyUWquM M/ZKhioORz5jcz3o+oncoiDqnYTLNvsfsQIU6W6hlm7bJb8EJlaVyshwDoK47d6Ea6zzDDvmE3 zxE= X-SBRS: 2.7 X-MesageID: 14374458 X-Ironport-Server: esa2.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.72,285,1580792400"; d="scan'208";a="14374458" From: Roger Pau Monne To: Date: Fri, 20 Mar 2020 20:07:37 +0100 Message-ID: <20200320190737.42110-4-roger.pau@citrix.com> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200320190737.42110-1-roger.pau@citrix.com> References: <20200320190737.42110-1-roger.pau@citrix.com> MIME-Version: 1.0 Subject: [Xen-devel] [PATCH 3/3] x86/nvmx: update exit bitmap on vmexit X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Kevin Tian , Jun Nakajima , Wei Liu , Andrew Cooper , Jan Beulich , Roger Pau Monne Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" Current code in nvmx_update_apicv set the guest interrupt status field but doesn't update the exit bitmap, which can cause issues of lost interrupts on the L1 hypervisor if vmx_intr_assist gets short-circuited by nvmx_intr_intercept returning true. Extract the code to update the exit bitmap from vmx_intr_assist into a helper and use it in nvmx_update_apicv when updating the guest interrupt status field. Signed-off-by: Roger Pau Monné --- xen/arch/x86/hvm/vmx/intr.c | 21 +++++++++++++-------- xen/arch/x86/hvm/vmx/vvmx.c | 1 + xen/include/asm-x86/hvm/vmx/vmx.h | 2 ++ 3 files changed, 16 insertions(+), 8 deletions(-) diff --git a/xen/arch/x86/hvm/vmx/intr.c b/xen/arch/x86/hvm/vmx/intr.c index 49a1295f09..000e14af49 100644 --- a/xen/arch/x86/hvm/vmx/intr.c +++ b/xen/arch/x86/hvm/vmx/intr.c @@ -224,6 +224,18 @@ static int nvmx_intr_intercept(struct vcpu *v, struct hvm_intack intack) return 0; } +void vmx_sync_exit_bitmap(struct vcpu *v) +{ + const unsigned int n = ARRAY_SIZE(v->arch.hvm.vmx.eoi_exit_bitmap); + unsigned int i; + + while ( (i = find_first_bit(&v->arch.hvm.vmx.eoi_exitmap_changed, n)) < n ) + { + clear_bit(i, &v->arch.hvm.vmx.eoi_exitmap_changed); + __vmwrite(EOI_EXIT_BITMAP(i), v->arch.hvm.vmx.eoi_exit_bitmap[i]); + } +} + void vmx_intr_assist(void) { struct hvm_intack intack; @@ -318,7 +330,6 @@ void vmx_intr_assist(void) intack.source != hvm_intsrc_vector ) { unsigned long status; - unsigned int i, n; /* * intack.vector is the highest priority vector. So we set eoi_exit_bitmap @@ -379,13 +390,7 @@ void vmx_intr_assist(void) intack.vector; __vmwrite(GUEST_INTR_STATUS, status); - n = ARRAY_SIZE(v->arch.hvm.vmx.eoi_exit_bitmap); - while ( (i = find_first_bit(&v->arch.hvm.vmx.eoi_exitmap_changed, - n)) < n ) - { - clear_bit(i, &v->arch.hvm.vmx.eoi_exitmap_changed); - __vmwrite(EOI_EXIT_BITMAP(i), v->arch.hvm.vmx.eoi_exit_bitmap[i]); - } + vmx_sync_exit_bitmap(v); pt_intr_post(v, intack); } diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c index 180d01e385..e041ecc115 100644 --- a/xen/arch/x86/hvm/vmx/vvmx.c +++ b/xen/arch/x86/hvm/vmx/vvmx.c @@ -1414,6 +1414,7 @@ static void nvmx_update_apicv(struct vcpu *v) status |= rvi & VMX_GUEST_INTR_STATUS_SUBFIELD_BITMASK; __vmwrite(GUEST_INTR_STATUS, status); + vmx_sync_exit_bitmap(v); } } diff --git a/xen/include/asm-x86/hvm/vmx/vmx.h b/xen/include/asm-x86/hvm/vmx/vmx.h index b334e1ec94..111ccd7e61 100644 --- a/xen/include/asm-x86/hvm/vmx/vmx.h +++ b/xen/include/asm-x86/hvm/vmx/vmx.h @@ -610,6 +610,8 @@ void update_guest_eip(void); void vmx_pi_per_cpu_init(unsigned int cpu); void vmx_pi_desc_fixup(unsigned int cpu); +void vmx_sync_exit_bitmap(struct vcpu *v); + #ifdef CONFIG_HVM void vmx_pi_hooks_assign(struct domain *d); void vmx_pi_hooks_deassign(struct domain *d);