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Re: [Qemu-devel] [RFC PATCH 0/3] pflash_cfi01: allow reading/writing it
From: |
Peter Maydell |
Subject: |
Re: [Qemu-devel] [RFC PATCH 0/3] pflash_cfi01: allow reading/writing it only in secure mode |
Date: |
Fri, 10 Apr 2015 10:54:48 +0100 |
On 9 April 2015 at 17:27, Paolo Bonzini <address@hidden> wrote:
> As I understand it, on ARM secure (EL3) and non-secure (EL<3) modes have
> effectively different address spaces. Therefore, one EL3 CPU could put
> the flash in MMIO mode for programming, while another EL1 CPU could be
> reading from the flash in ROM mode.
Well, not really -- you'd put the flash into the Secure address
space only. Then the CPU at EL3 could access it, but the CPU
at EL1 can never do so. For reading or writing UEFI variables
(or flashing a new UEFI firmware image) the EL1 OS must make a
monitor call (hypercall) up to EL3 to request that action.
-- PMM
- [Qemu-devel] [PATCH 3/3] pflash_cfi01: add secure property, (continued)
- [Qemu-devel] [PATCH 3/3] pflash_cfi01: add secure property, Paolo Bonzini, 2015/04/09
- [Qemu-devel] [PATCH 2/3] pflash_cfi01: change to new-style MMIO accessors, Paolo Bonzini, 2015/04/09
- Re: [Qemu-devel] [RFC PATCH 0/3] pflash_cfi01: allow reading/writing it only in secure mode, Peter Maydell, 2015/04/09
- Re: [Qemu-devel] [RFC PATCH 0/3] pflash_cfi01: allow reading/writing it only in secure mode, Paolo Bonzini, 2015/04/09
- Re: [Qemu-devel] [RFC PATCH 0/3] pflash_cfi01: allow reading/writing it only in secure mode, Peter Maydell, 2015/04/09
- Re: [Qemu-devel] [RFC PATCH 0/3] pflash_cfi01: allow reading/writing it only in secure mode, Edgar E. Iglesias, 2015/04/09
- Re: [Qemu-devel] [RFC PATCH 0/3] pflash_cfi01: allow reading/writing it only in secure mode, Paolo Bonzini, 2015/04/09
- Re: [Qemu-devel] [RFC PATCH 0/3] pflash_cfi01: allow reading/writing it only in secure mode, Laszlo Ersek, 2015/04/09
- Re: [Qemu-devel] [RFC PATCH 0/3] pflash_cfi01: allow reading/writing it only in secure mode, Paolo Bonzini, 2015/04/09
- Re: [Qemu-devel] [RFC PATCH 0/3] pflash_cfi01: allow reading/writing it only in secure mode, Edgar E. Iglesias, 2015/04/09
- Re: [Qemu-devel] [RFC PATCH 0/3] pflash_cfi01: allow reading/writing it only in secure mode,
Peter Maydell <=