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client-ip=162.221.158.21; receiver=esa1.hc3370-68.iphmx.com; envelope-from="roger.pau@citrix.com"; x-sender="postmaster@mail.citrix.com"; x-conformance=sidf_compatible IronPort-SDR: dS6Vj+7q+ncd7N2PkpBeRTt+h1ZbWV8tRxqWhCOByTgpgv97p+mjWRQMGcn5/euDjQGvFwiMXQ DyEpNN7rWhJlWv6yRE4mL0e4pQ5dzmJtX45X1H+eowrUAi6FJL6KucnIXUeqn7MkOg3pnOeblC CNylo4o5TDbfQnY5gGNwU3b6UjkP9l3ibEBdqb9warRQc0h6Y2BOB/WjkiGXkY5fe1jIRA0sTc Bx4nrdPBIyOop6ySPaqAycf/PTELISUgRooPm/mFpbw3ss5jco9tSvyf/glXj9IcHPYRVw3qF0 81s= X-SBRS: 2.7 X-MesageID: 12106523 X-Ironport-Server: esa1.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.70,402,1574139600"; d="scan'208";a="12106523" From: Roger Pau Monne To: Date: Tue, 4 Feb 2020 18:34:55 +0100 Message-ID: <20200204173455.22020-4-roger.pau@citrix.com> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200204173455.22020-1-roger.pau@citrix.com> References: <20200204173455.22020-1-roger.pau@citrix.com> MIME-Version: 1.0 Subject: [Xen-devel] [PATCH v4 3/3] nvmx: always trap accesses to x2APIC MSRs 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" Nested VMX doesn't expose support for SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE, SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY or SECONDARY_EXEC_APIC_REGISTER_VIRT, and hence the x2APIC MSRs should always be trapped in the nested guest MSR bitmap, or else a nested guest could access the hardware x2APIC MSRs given certain conditions. Accessing the hardware MSRs could be achieved by forcing the L0 Xen to use SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE and SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY or SECONDARY_EXEC_APIC_REGISTER_VIRT (if supported), and then creating a L2 guest with a MSR bitmap that doesn't trap accesses to the x2APIC MSR range. Then OR'ing both L0 and L1 MSR bitmaps would result in a bitmap that doesn't trap certain x2APIC MSRs and a VMCS that doesn't have SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE and SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY or SECONDARY_EXEC_APIC_REGISTER_VIRT set either. Fix this by making sure x2APIC MSRs are always trapped in the nested MSR bitmap. Signed-off-by: Roger Pau Monné --- Changes since v3: - Use bitmap_set. Changes since v1: - New in this version (split from #1 patch). - Use non-locked set_bit. --- xen/arch/x86/hvm/vmx/vvmx.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c index 46c51a95b9..56e0d884b8 100644 --- a/xen/arch/x86/hvm/vmx/vvmx.c +++ b/xen/arch/x86/hvm/vmx/vvmx.c @@ -596,6 +596,13 @@ static void update_msrbitmap(struct vcpu *v, uint32_t shadow_ctrl) v->arch.hvm.vmx.msr_bitmap->write_high, sizeof(msr_bitmap->write_high) * 8); + /* + * Nested VMX doesn't support any x2APIC hardware virtualization, so + * make sure all the x2APIC MSRs are trapped. + */ + bitmap_set(msr_bitmap->read_low, MSR_X2APIC_FIRST, 0xff); + bitmap_set(msr_bitmap->write_low, MSR_X2APIC_FIRST, 0xff); + unmap_domain_page(msr_bitmap); __vmwrite(MSR_BITMAP, page_to_maddr(nvmx->msr_merged));