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Re: [Xen-devel] [RFC PATCH 1/2] mem_access: Fix npfec.kind propagation
- To: George Dunlap <george.dunlap@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 26 Sep 2018 18:00:21 +0100
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- Cc: Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>, Tamas K Lengyel <tamas.lengyel@xxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Wed, 26 Sep 2018 17:04:47 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 26/09/18 17:47, George Dunlap wrote:
> The name of the "with_gla" flag is confusing; it has nothing to do
> with the existence or lack thereof of a faulting GLA, but rather where
> the fault originated. The npfec.kind value is always valid, and
> should thus be propagated, regardless of whether gla_valid is set or
> not.
>
> In particular, gla_valid will never be set on AMD systems; but
> npfec.kind will still be valid and should still be propagated.
>
> Signed-off-by: Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>
> Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxx>
> ---
> CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> CC: Jan Beulich <jbeulich@xxxxxxxx>
> CC: Tim Deegan <tim@xxxxxxx>
> CC: Tamas K Lengyel <tamas.lengyel@xxxxxxxxxxxx>
> CC: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
> ---
> xen/arch/x86/mm/mem_access.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/xen/arch/x86/mm/mem_access.c b/xen/arch/x86/mm/mem_access.c
> index d9e64fcbb9..699a315076 100644
> --- a/xen/arch/x86/mm/mem_access.c
> +++ b/xen/arch/x86/mm/mem_access.c
> @@ -232,12 +232,12 @@ bool p2m_mem_access_check(paddr_t gpa, unsigned long
> gla,
> {
> req->u.mem_access.flags |= MEM_ACCESS_GLA_VALID;
> req->u.mem_access.gla = gla;
> -
> - if ( npfec.kind == npfec_kind_with_gla )
> - req->u.mem_access.flags |= MEM_ACCESS_FAULT_WITH_GLA;
> - else if ( npfec.kind == npfec_kind_in_gpt )
> - req->u.mem_access.flags |= MEM_ACCESS_FAULT_IN_GPT;
> }
> +
> + if ( npfec.kind == npfec_kind_with_gla )
> + req->u.mem_access.flags |= MEM_ACCESS_FAULT_WITH_GLA;
> + else if ( npfec.kind == npfec_kind_in_gpt )
> + req->u.mem_access.flags |= MEM_ACCESS_FAULT_IN_GPT;
Nit. Newline here please, as it is not logically related with the block
below.
~Andrew
> req->u.mem_access.flags |= npfec.read_access ? MEM_ACCESS_R : 0;
> req->u.mem_access.flags |= npfec.write_access ? MEM_ACCESS_W : 0;
> req->u.mem_access.flags |= npfec.insn_fetch ? MEM_ACCESS_X : 0;
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