Re: [RFC PATCH] target/i386: kvm: Enable KVM_FEATURE_PCI_GO_MMCONFIG CPUID bit

2020-07-31 Thread Eduardo Habkost
On Fri, Jul 31, 2020 at 08:49:38PM +0200, Julia Suvorova wrote: > This feature allows MMCONFIG to be used even to access the base PCI > config space [1]. This means increased performance: one access to > MMCONFIG instead of two conventional accesses to I/O ports. > > Q35 makes no distinction in ba

[RFC PATCH] target/i386: kvm: Enable KVM_FEATURE_PCI_GO_MMCONFIG CPUID bit

2020-07-31 Thread Julia Suvorova
This feature allows MMCONFIG to be used even to access the base PCI config space [1]. This means increased performance: one access to MMCONFIG instead of two conventional accesses to I/O ports. Q35 makes no distinction in base or extended PCI config access to MMCONFIG, MMCONFIG is always on, and i