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Re: [PATCH v3 2/2] x86: Add Support for Paging-Write Feature
- To: Petr Beneš <w1benny@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 7 Jan 2025 17:46:26 +0100
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- Cc: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>, Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>, Petre Pircalabu <ppircalabu@xxxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 07 Jan 2025 16:46:30 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.01.2025 18:13, Petr Beneš wrote:
> --- a/xen/arch/x86/mm/p2m-ept.c
> +++ b/xen/arch/x86/mm/p2m-ept.c
> @@ -154,27 +154,39 @@ static void ept_p2m_type_to_flags(const struct
> p2m_domain *p2m,
> case p2m_access_n:
> case p2m_access_n2rwx:
> entry->r = entry->w = entry->x = 0;
> + entry->pw = 0;
> break;
> case p2m_access_r:
> entry->w = entry->x = 0;
> + entry->pw = 0;
> break;
> case p2m_access_w:
> entry->r = entry->x = 0;
> + entry->pw = 0;
> break;
> case p2m_access_x:
> entry->r = entry->w = 0;
> + entry->pw = 0;
> break;
> case p2m_access_rx:
> case p2m_access_rx2rw:
> entry->w = 0;
> + entry->pw = 0;
> break;
> case p2m_access_wx:
> entry->r = 0;
> + entry->pw = 0;
> break;
> case p2m_access_rw:
> entry->x = 0;
> + entry->pw = 0;
> break;
> case p2m_access_rwx:
> + entry->pw = 0;
> + break;
> + case p2m_access_r_pw:
> + entry->w = entry->x = 0;
> + entry->pw = !!cpu_has_vmx_ept_paging_write;
> break;
> }
Hmm ... Instead of you touching the bit in every one of the case blocks,
I was expecting you to clear the bit ahead of the switch(), accepting a
double update in the p2m_access_r_pw case.
Jan
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