Rob Bradford 2d457ab974 vmm: device_manager: Make PMEM "discard_writes" mode true CoW ... The PMEM support has an option called "discard_writes" which when true will prevent changes to the device from hitting the backing file. This is trying to be the equivalent of "readonly" support of the block device. Previously the memory of the device was marked as KVM_READONLY. This resulted in a trap when the guest attempted to write to it resulting a VM exit (and recently a warning). This has a very detrimental effect on the performance so instead make "discard_writes" truly CoW by mapping the memory as `PROT_READ | PROT_WRITE` and using `MAP_PRIVATE` to establish the CoW mapping. Fixes: #1795 Signed-off-by: Rob Bradford <robert.bradford@intel.com>		2020-10-02 14:26:15 +02:00
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src	vmm: device_manager: Make PMEM "discard_writes" mode true CoW	2020-10-02 14:26:15 +02:00
Cargo.toml	build(deps): bump libc from 0.2.77 to 0.2.78	2020-10-01 05:40:02 +00:00