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Tue, 25 Feb 2025 07:00:06 -0800 (PST) Message-ID: <4a40f0ea-2ce0-4485-aa70-b23634f73dc1@suse.com> Date: Tue, 25 Feb 2025 16:00:05 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= From: Jan Beulich Subject: [PATCH] x86/DM: slightly simplify set_mem_type() 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 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1740495630904019100 Content-Type: text/plain; charset="utf-8" There's no need to access the static array twice per iteration, even more so when that's effectively open-coding array_access_nospec(). Along with renaming the "new type" variable, rename the "old type" one as well, to clarify which one is which. Signed-off-by: Jan Beulich Acked-by: Andrew Cooper --- a/xen/arch/x86/hvm/dm.c +++ b/xen/arch/x86/hvm/dm.c @@ -219,7 +219,8 @@ static int set_mem_type(struct domain *d struct xen_dm_op_set_mem_type *data) { xen_pfn_t last_pfn =3D data->first_pfn + data->nr - 1; - unsigned int iter =3D 0, mem_type; + unsigned int iter =3D 0; + p2m_type_t nt; int rc =3D 0; =20 /* Interface types to internal p2m types */ @@ -239,16 +240,16 @@ static int set_mem_type(struct domain *d unlikely(data->mem_type =3D=3D HVMMEM_unused) ) return -EINVAL; =20 - mem_type =3D array_index_nospec(data->mem_type, ARRAY_SIZE(memtype)); + nt =3D array_access_nospec(memtype, data->mem_type); =20 - if ( mem_type =3D=3D HVMMEM_ioreq_server ) + if ( nt =3D=3D p2m_ioreq_server ) { unsigned int flags; =20 if ( !hap_enabled(d) ) return -EOPNOTSUPP; =20 - /* Do not change to HVMMEM_ioreq_server if no ioreq server mapped.= */ + /* Do not change to p2m_ioreq_server if no ioreq server mapped. */ if ( !p2m_get_ioreq_server(d, &flags) ) return -EINVAL; } @@ -256,22 +257,22 @@ static int set_mem_type(struct domain *d while ( iter < data->nr ) { unsigned long pfn =3D data->first_pfn + iter; - p2m_type_t t; + p2m_type_t ot; =20 - get_gfn_unshare(d, pfn, &t); - if ( p2m_is_paging(t) ) + get_gfn_unshare(d, pfn, &ot); + if ( p2m_is_paging(ot) ) { put_gfn(d, pfn); p2m_mem_paging_populate(d, _gfn(pfn)); return -EAGAIN; } =20 - if ( p2m_is_shared(t) ) + if ( p2m_is_shared(ot) ) rc =3D -EAGAIN; - else if ( !allow_p2m_type_change(t, memtype[mem_type]) ) + else if ( !allow_p2m_type_change(ot, nt) ) rc =3D -EINVAL; else - rc =3D p2m_change_type_one(d, pfn, t, memtype[mem_type]); + rc =3D p2m_change_type_one(d, pfn, ot, nt); =20 put_gfn(d, pfn);