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vga optimization (Glauber Costa)

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Hypervisors like KVM perform badly while doing mmio on
a loop, because it'll generate an exit on each access.
This is the case with VGA, which results in very bad
performance.

In this patch, we map the linear frame buffer as RAM,
make sure it has dirty region tracking enabled, and then
just let the region to be written.

Cleanups suggestions by:
  Stefano Stabellini <stefano.stabellini@eu.citrix.com>

Signed-off-by: Glauber Costa <glommer@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5793 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2008-11-24 20:21:41 +00:00
parent 5832d1f2f5
commit 2bec46dc97
5 changed files with 129 additions and 0 deletions
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6
exec.c
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@ -1887,6 +1887,12 @@ int cpu_physical_memory_get_dirty_tracking(void)
return in_migration;
}
void cpu_physical_sync_dirty_bitmap(target_phys_addr_t start_addr, target_phys_addr_t end_addr)
{
if (kvm_enabled())
kvm_physical_sync_dirty_bitmap(start_addr, end_addr);
}
static inline void tlb_update_dirty(CPUTLBEntry *tlb_entry)
{
ram_addr_t ram_addr;