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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 May 2022 07:39:47.9887 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1e33d8e9-09ed-431a-32d0-08da2da1440c X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: VE1EUR03FT029.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM5PR0801MB1874 Hi Julien, > On 3 May 2022, at 19:08, Julien Grall wrote: >=20 > Hi Bertrand, >=20 > On 03/05/2022 10:38, Bertrand Marquis wrote: >> Sync arm64 sysreg bit shift definitions with status of Linux kernel as >> of 5.18-rc3 version (linux commit b2d229d4ddb1). >> Sync ID registers sanitization with the status of Linux 5.18-rc3 and add >> sanitization of ISAR2 registers. > Please outline which specific commits you are actually backported. This w= ould help to know what changed, why and also keep track of the autorships. >=20 > When possible, the changes should be separated to match each Linux commit= we backport. As those are exactly identical to the linux tree, one can easily use git bl= ame on the linux source tree to find those information if it is needed. I checked a bit and this is not something that was required before (for exa= mple when the cpufeature was introduced). >=20 >> Complete AA64ISAR2 and AA64MMFR1 with more fields. >> While there add a comment for MMFR bitfields as for other registers in >> the cpuinfo structure definition. >=20 > AFAICT, this patch is doing 3 different things that are somewhat related: > - Sync cpufeature.c > - Update the headers with unused defines > - Complete the structure cpufeature.h >=20 > All those changes seem to be independent, so I think they should be done = separately. This would help to keep the authorship right (your code vs Linu= x code). This and the previous request to split using linux commit will actually end= up in 10 patches or more. In the current, the change can easily be checked doing a diff with the ment= ioned Linux version, so I am not really thrilled to make it more complex. Please confirm that all this is really what you want. >=20 >> Signed-off-by: Bertrand Marquis >> --- >> xen/arch/arm/arm64/cpufeature.c | 18 +++++- >> xen/arch/arm/include/asm/arm64/sysregs.h | 76 ++++++++++++++++++++---- >> xen/arch/arm/include/asm/cpufeature.h | 14 ++++- >> 3 files changed, 91 insertions(+), 17 deletions(-) >> diff --git a/xen/arch/arm/arm64/cpufeature.c b/xen/arch/arm/arm64/cpufea= ture.c >> index 6e5d30dc7b..d9039d37b2 100644 >> --- a/xen/arch/arm/arm64/cpufeature.c >> +++ b/xen/arch/arm/arm64/cpufeature.c >> @@ -143,6 +143,16 @@ static const struct arm64_ftr_bits ftr_id_aa64isar1= [] =3D { >> ARM64_FTR_END, >> }; >> +static const struct arm64_ftr_bits ftr_id_aa64isar2[] =3D { >> + ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_HIGHER_SAFE, ID_AA64ISAR2_C= LEARBHB_SHIFT, 4, 0), >> + ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), >> + FTR_STRICT, FTR_EXACT, ID_AA64ISAR2_APA3_SHIFT, 4, 0), >> + ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), > So we are using CONFIG_ARM64_PTR_AUTH. But this is not defined in Kconfig= . I realize there are more in cpufeature.c (somehow I didn't spot during pr= eview), but I don't think this is right to define CONFIG_* without an assoc= iated entry in Kconfig. >=20 > In one hand, I think it would be odd to add an entry in Kconfig because X= en wouldn't properly work if selected. On the other hand, it is useful if w= hen we will implement pointer authentification. >=20 > So maybe we should just add the Kconfig entry with a comment explaning wh= y they are not selected. Any thoughts? This is really right and a very good catch. I think it would make sense to introduce those in Kconfig in order to keep = the code equivalent to Linux. So I would suggest here to add hidden entries like this: ARM64_PTR_AUTH def_bool n depends on ARM64 help Pointer authentication support. This feature is not supported by Xen. Cheers Bertrand >=20 > Cheers, >=20 > --=20 > Julien Grall