[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [XEN PATCH] xen/arm: Hide Pointer Authentication (PAC)
On 1/20/21 5:44 PM, Julien Grall wrote: > Hi Vladimir, > > On 20/01/2021 11:27, Vladimir Murzin wrote: >> The ARMv8.3 Pointer Authentication extension is not supported by Xen >> at the moment, so do not expose that via ID register. >> >> Signed-off-by: Vladimir Murzin <vladimir.murzin@xxxxxxx> >> Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx> >> --- >> xen/arch/arm/cpufeature.c | 6 +++++ >> xen/include/asm-arm/cpufeature.h | 38 +++++++++++++++++++++++++++++++- >> 2 files changed, 43 insertions(+), 1 deletion(-) >> >> diff --git a/xen/arch/arm/cpufeature.c b/xen/arch/arm/cpufeature.c >> index 99fe4db28..1d8878380 100644 >> --- a/xen/arch/arm/cpufeature.c >> +++ b/xen/arch/arm/cpufeature.c >> @@ -187,6 +187,12 @@ static int __init create_guest_cpuinfo(void) >> /* Hide MTE support as Xen does not support it */ >> guest_cpuinfo.pfr64.mte = 0; >> + >> + /* Hide PAC support as Xen does not support it */ >> + guest_cpuinfo.isa64.apa = 0; >> + guest_cpuinfo.isa64.api = 0; >> + guest_cpuinfo.isa64.gpa = 0; >> + guest_cpuinfo.isa64.gpi = 0; >> #endif >> /* Hide AMU support */ >> diff --git a/xen/include/asm-arm/cpufeature.h >> b/xen/include/asm-arm/cpufeature.h >> index c6e5711b2..43135abef 100644 >> --- a/xen/include/asm-arm/cpufeature.h >> +++ b/xen/include/asm-arm/cpufeature.h >> @@ -212,8 +212,44 @@ struct cpuinfo_arm { >> }; >> } mm64; >> - struct { >> + union { >> uint64_t bits[2]; >> + struct { >> + /* ISAR0 */ >> + unsigned long __res0:4; >> + unsigned long aes:4; >> + unsigned long sha1:4; >> + unsigned long sha2:4; >> + unsigned long crc32:4; >> + unsigned long atomic:4; >> + unsigned long __res1:4; >> + unsigned long rdm:4; >> + unsigned long sha3:4; >> + unsigned long sm3:4; >> + unsigned long sm4:4; >> + unsigned long dp:4; >> + unsigned long fhm:4; >> + unsigned long ts:4; >> + unsigned long tlb:4; >> + unsigned long rndr:4; >> + >> + /* ISAR1 */ >> + unsigned long dpb:4; >> + unsigned long apa:4; >> + unsigned long api:4; >> + unsigned long jscvt:4; >> + unsigned long fcma:4; >> + unsigned long lrcpc:4; >> + unsigned long gpa:4; >> + unsigned long gpi:4; >> + unsigned long frintts:4; >> + unsigned long sb:4; >> + unsigned long specres:4; >> + unsigned long bf16:4; >> + unsigned long dgh:4; >> + unsigned long i8mm:4; >> + unsigned long __res0:8; > > This unfortunately break the build on arm64 becase __res0 is defined twiced > in the structure: > > oss/xen/xen/include/asm/cpufeature.h:251:27: error: duplicate member ‘__res0’ > unsigned long __res0:8; > ^~~~~~ > Sorry about that, I should have double checked that patch still compiles. > The change is trivial, so I have resolved it (see change below) and committed > it: > > diff --git a/xen/include/asm-arm/cpufeature.h > b/xen/include/asm-arm/cpufeature.h > index 2baf7919615d..70cb67301f74 100644 > --- a/xen/include/asm-arm/cpufeature.h > +++ b/xen/include/asm-arm/cpufeature.h > @@ -248,7 +248,7 @@ struct cpuinfo_arm { > unsigned long bf16:4; > unsigned long dgh:4; > unsigned long i8mm:4; > - unsigned long __res0:8; > + unsigned long __res2:8; > }; > } isa64; > LGTM, Great Thanks! Vladimir > Cheers, >
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