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Thu, 13 Mar 2025 06:33:30 -0700 (PDT) Message-ID: Date: Thu, 13 Mar 2025 14:33:30 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: [PATCH 1/2] VT-d: move obtaining of MSI/HPET source ID From: Jan Beulich To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= References: <8b610dba-0ce9-47ed-808d-035dc48f4f04@suse.com> Content-Language: en-US Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: <8b610dba-0ce9-47ed-808d-035dc48f4f04@suse.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1741872827474019100 This was the original attempt to address XSA-467, until it was found that IRQs can be off already from higher up the call stack. Nevertheless moving code out of locked regions is generally desirable anyway; some of the callers, after all, don't disable interrupts or acquire other locks. Hence, despite this not addressing the original report: Data collection solely depends on the passed in PCI device. Furthermore, since the function only writes to a local variable, we can pull the invocation of set_msi_source_id() (and also set_hpet_source_id()) ahead of the acquiring of the (IRQ-safe) lock. Signed-off-by: Jan Beulich Reviewed-by: Roger Pau Monn=C3=A9 Reviewed-by: Andrew Cooper --- a/xen/drivers/passthrough/vtd/intremap.c +++ b/xen/drivers/passthrough/vtd/intremap.c @@ -508,6 +508,11 @@ static int msi_msg_to_remap_entry( const struct pi_desc *pi_desc =3D msi_desc->pi_desc; bool alloc =3D false; =20 + if ( pdev ) + set_msi_source_id(pdev, &new_ire); + else + set_hpet_source_id(msi_desc->hpet_id, &new_ire); + if ( msi_desc->msi_attrib.type =3D=3D PCI_CAP_ID_MSI ) nr =3D msi_desc->msi.nvec; =20 @@ -575,11 +580,6 @@ static int msi_msg_to_remap_entry( new_ire.post.p =3D 1; } =20 - if ( pdev ) - set_msi_source_id(pdev, &new_ire); - else - set_hpet_source_id(msi_desc->hpet_id, &new_ire); - /* now construct new MSI/MSI-X rte entry */ remap_rte =3D (struct msi_msg_remap_entry *)msg; remap_rte->address_lo.dontcare =3D 0;