[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen staging-4.12] vpci: honor read-only devices
commit 61770e75d9d54d6bb8eb99ed6da855dd2f691c70 Author: Roger Pau Monné <roger.pau@xxxxxxxxxx> AuthorDate: Fri Oct 25 11:36:03 2019 +0200 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Fri Oct 25 11:36:03 2019 +0200 vpci: honor read-only devices Don't allow the hardware domain write access the PCI config space of devices marked as read-only. Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx> master commit: 79f9ba78380fb3f4bf509e5c726c6cdd76e00c4f master date: 2019-09-17 16:13:39 +0200 --- tools/tests/vpci/emul.h | 3 +++ xen/drivers/vpci/vpci.c | 5 +++++ 2 files changed, 8 insertions(+) diff --git a/tools/tests/vpci/emul.h b/tools/tests/vpci/emul.h index 5d47544bf7..2e1d3057c9 100644 --- a/tools/tests/vpci/emul.h +++ b/tools/tests/vpci/emul.h @@ -92,6 +92,9 @@ typedef union { #define xfree(p) free(p) #define pci_get_pdev_by_domain(...) &test_pdev +#define pci_get_ro_map(...) NULL + +#define test_bit(...) false /* Dummy native helpers. Writes are ignored, reads return 1's. */ #define pci_conf_read8(...) 0xff diff --git a/xen/drivers/vpci/vpci.c b/xen/drivers/vpci/vpci.c index 82607bdb9a..986da948f4 100644 --- a/xen/drivers/vpci/vpci.c +++ b/xen/drivers/vpci/vpci.c @@ -421,6 +421,7 @@ void vpci_write(pci_sbdf_t sbdf, unsigned int reg, unsigned int size, const struct pci_dev *pdev; const struct vpci_register *r; unsigned int data_offset = 0; + const unsigned long *ro_map = pci_get_ro_map(sbdf.seg); if ( !size ) { @@ -428,6 +429,10 @@ void vpci_write(pci_sbdf_t sbdf, unsigned int reg, unsigned int size, return; } + if ( ro_map && test_bit(sbdf.bdf, ro_map) ) + /* Ignore writes to read-only devices. */ + return; + /* * Find the PCI dev matching the address. * Passthrough everything that's not trapped. -- generated by git-patchbot for /home/xen/git/xen.git#staging-4.12 _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/xen-changelog
|
Lists.xenproject.org is hosted with RackSpace, monitoring our |