Alberto García

O Grove (Spain)

One of the founding members of Igalia, Alberto loves computing since he got his first ZX Spectrum in the early nineties.

Latest Updates

Alberto García 16/11/2017

“Improving the performance of the qcow2 format” at KVM Forum 2017

I was in Prague last month for the 2017 edition of the KVM Forum. There I gave a talk about some of the work that I’ve been doing this year to improve the qcow2 file format used by QEMU for storing disk images. The focus of my work is to make qcow2...

Alberto García 08/02/2017

QEMU and the qcow2 metadata checks

When choosing a disk image format for your virtual machine one of the factors to take into considerations is its I/O performance. In this post I’ll talk a bit about the internals of qcow2 and about one of the aspects that can affect its performance...

Alberto García 24/05/2016

I/O bursts with QEMU 2.6

QEMU 2.6 was released a few days ago. One new feature that I have been working on is the new way to configure I/O limits in disk drives to allow bursts and increase the responsiveness of the virtual machine. In this post I’ll try to explain how it...

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block: Use bdrv_reopen_set_read_only() in stream_start/complete()

block: Use bdrv_reopen_set_read_only() in stream_start/complete() This patch replaces the bdrv_reopen() calls that set and remove the BDRV_O_RDWR flag with the new bdrv_reopen_set_read_only() function. Signed-off-by: Alberto Garcia Reviewed-by: Max...

Alberto García16/12/2018

block: Use bdrv_reopen_set_read_only() in bdrv_commit()

block: Use bdrv_reopen_set_read_only() in bdrv_commit() This patch replaces the bdrv_reopen() calls that set and remove the BDRV_O_RDWR flag with the new bdrv_reopen_set_read_only() function. Signed-off-by: Alberto Garcia Reviewed-by: Max Reitz...

Alberto García16/12/2018

block: Use bdrv_reopen_set_read_only() in commit_start/complete()

block: Use bdrv_reopen_set_read_only() in commit_start/complete() This patch replaces the bdrv_reopen() calls that set and remove the BDRV_O_RDWR flag with the new bdrv_reopen_set_read_only() function. Signed-off-by: Alberto Garcia Reviewed-by: Max...

Alberto García16/12/2018

block: Use bdrv_reopen_set_read_only() in bdrv_backing_update_filename()

block: Use bdrv_reopen_set_read_only() in bdrv_backing_update_filename() This patch replaces the bdrv_reopen() calls that set and remove the BDRV_O_RDWR flag with the new bdrv_reopen_set_read_only() function. Signed-off-by: Alberto Garcia...

Alberto García16/12/2018

block: Add bdrv_reopen_set_read_only()

block: Add bdrv_reopen_set_read_only() Most callers of bdrv_reopen() only use it to switch a BlockDriverState between read-only and read-write, so this patch adds a new function that does just that. We also want to get rid of the flags parameter in...

Alberto García16/12/2018