[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [PATCH v1 04/28] x86/hvm: avic: add domain state initialization
- To: <dmukhin@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jason Andryuk <jason.andryuk@xxxxxxx>
- Date: Thu, 5 Nov 2026 18:10:10 -0500
- Arc-authentication-results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=ford.com smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0)
- Arc-message-signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=BpV/afrcWR9sqTsx/NOCi/47YkrQc3asyulnlcV5SmY=; b=vRpw77Z9huQymHFoMm/H07SH03ZDJoK2EmWyGPeP+NDi8f238hVa0q+AgwBSlW+Bs6UEuoMqe/vjxHCISJiZM5D/+A4WYSo9QplCDaUv//0NtsDNO4r7BP3I4T28Kab1weEPo7e6zpG3fRORdMWd6r+nrexJuBVgvQQhZxB7qJGE1rJfexi8x5neij9ncjsHrDFNCkE1Y0HjAVCwrXvD679D2+iEkwjpV2XnRtnAY7YUcuQbN1JS2k+JKdPF8Vxa6U3p3bm7kqc+NEvFHt9shH+sFuYYD5Y7gbFOXIAKhDvhc5WJx1ndSDzCBLeuyXxWHYE2hMQvaU4L6WlVQigD3w==
- Arc-seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=M8lwdeVne1ytgK12/an8SM1LpQPdZfbHOKG1bsuXHCl9BZZdLLz6DndWxIVS35y8BcqhDXymtTZ+4xvIGyWa/2luwgOvvMJMZitN2esU2+4vnis/Lb03Z8ZoedwPrvd2g4GFVqhgjnf6sYxNklBw0Nhc2Bh04zkoaySaU5q61n+jetMBv7/sHgvQvqEXezypKf0+aZPhDMI7stVgo+xNJZDLf5+KBeY9Hd/CcT4lE5i9X5nfQ9JscRDDdTN5An3xw+ochkq9i4snnmY6G1R8gUU9yEC3d0+Dw0QydIusLQ0d06j9sbVtfgd/Cr2TTZ+8hU/v8XIW+J1e46X4vknLRg==
- Authentication-results: eu.smtp.expurgate.cloud; dkim=pass header.s=selector1 header.d=amd.com header.i="@amd.com" header.h="From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck"
- Cc: <andrew.cooper3@xxxxxxxxxx>, <jbeulich@xxxxxxxx>, <roger@xxxxxxxxxxxxxx>, <teddy.astie@xxxxxxxxxx>, <dmukhin@xxxxxxx>
- Delivery-date: Thu, 05 Nov 2026 23:10:25 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 2026-11-04 20:33, dmukhin@xxxxxxxx wrote:
From: Denis Mukhin <dmukhin@xxxxxxxx>
Establish per-domain SVM AVIC backing page mapping and SPA mappings
for APIC physical/logical ID tables. Use MEMF_no_refcount mappings
similarly to Intel's VMX APICv setup.
Gate per-domain AVIC state initialization behind 'svm_avic=' command
line option.
AIUI, "-" is preferred, so 'svm-avic='.
+
+/*
+ * Enable guest accesses to APIC_DEFAULT_PHYS_BASE.
+ *
+ * AVIC walks the nested page table to check access permissions, but
+ * ignores the SPA from the leaf entry and instead uses the address in
+ * VMCB.avic_backing_page.
+ *
+ * Install a mapping so APIC accesses don't trap to Xen while xAPIC is
+ * accelerated.
Maybe:
"""
Install a mapping to the shared avic_acpi_access_page. This populates
the nested page tables, so APIC accesses don't trap into Xen.
"""
With those two changes:
Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
|
