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| author | Christoffer Dall <christoffer.dall@linaro.org> | 2014-08-19 12:18:04 +0200 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2014-08-27 22:46:09 +0200 |
| commit | 98047888bb9fd57734028c44ec17413ddd623958 (patch) | |
| tree | 976048e835e2f88df23b73aad4e0591102ab8c6e /arch/arm/kvm/arm.c | |
| parent | 64d831269ccbca1fc6d739a0f3c8aa24afb43a5e (diff) | |
| download | lwn-98047888bb9fd57734028c44ec17413ddd623958.tar.gz lwn-98047888bb9fd57734028c44ec17413ddd623958.zip | |
arm/arm64: KVM: Support KVM_CAP_READONLY_MEM
When userspace loads code and data in a read-only memory regions, KVM
needs to be able to handle this on arm and arm64. Specifically this is
used when running code directly from a read-only flash device; the
common scenario is a UEFI blob loaded with the -bios option in QEMU.
Note that the MMIO exit on writes to a read-only memory is ABI and can
be used to emulate block-erase style flash devices.
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm/kvm/arm.c')
| -rw-r--r-- | arch/arm/kvm/arm.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index 9f788ebac55b..ac306b4dbe1d 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -188,6 +188,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_ONE_REG: case KVM_CAP_ARM_PSCI: case KVM_CAP_ARM_PSCI_0_2: + case KVM_CAP_READONLY_MEM: r = 1; break; case KVM_CAP_COALESCED_MMIO: |