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Message-Id: <1698854508-23036-1-git-send-email-niyelchu@linux.microsoft.com>
Date: Wed, 1 Nov 2023 09:01:48 -0700
From: Nischala Yelchuri <niyelchu@...ux.microsoft.com>
To: linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org,
linux-fbdev@...r.kernel.org, kys@...rosoft.com,
haiyangz@...rosoft.com, wei.liu@...nel.org, decui@...rosoft.com,
tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
drawat.floss@...il.com, maarten.lankhorst@...ux.intel.com,
mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com,
daniel@...ll.ch, dri-devel@...ts.freedesktop.org, deller@....de
Cc: mhklinux@...look.com, mhkelley@...look.com,
singhabhinav9051571833@...il.com, niyelchu@...rosoft.com
Subject: [PATCH] Replace ioremap_cache() with memremap()
Current Hyper-V code for CoCo VMs uses ioremap_cache() to map normal memory as decrypted.
ioremap_cache() is ideally used to map I/O device memory when it has the characteristics
of normal memory. It should not be used to map normal memory as the returned pointer
has the __iomem attribute.
Fix current code by replacing ioremap_cache() with memremap().
No functional change intended.
Signed-off-by: Nischala Yelchuri <niyelchu@...ux.microsoft.com>
---
arch/x86/hyperv/hv_init.c | 6 +++---
drivers/gpu/drm/hyperv/hyperv_drm_drv.c | 2 +-
drivers/hv/hv.c | 13 +++++++------
drivers/video/fbdev/hyperv_fb.c | 6 +++---
4 files changed, 14 insertions(+), 13 deletions(-)
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 21556ad87..fae43c040 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -68,9 +68,9 @@ static int hyperv_init_ghcb(void)
*/
rdmsrl(MSR_AMD64_SEV_ES_GHCB, ghcb_gpa);
- /* Mask out vTOM bit. ioremap_cache() maps decrypted */
+ /* Mask out vTOM bit. memremap() maps decrypted with MEMREMAP_DEC */
ghcb_gpa &= ~ms_hyperv.shared_gpa_boundary;
- ghcb_va = (void *)ioremap_cache(ghcb_gpa, HV_HYP_PAGE_SIZE);
+ ghcb_va = memremap(ghcb_gpa, HV_HYP_PAGE_SIZE, MEMREMAP_WB | MEMREMAP_DEC);
if (!ghcb_va)
return -ENOMEM;
@@ -238,7 +238,7 @@ static int hv_cpu_die(unsigned int cpu)
if (hv_ghcb_pg) {
ghcb_va = (void **)this_cpu_ptr(hv_ghcb_pg);
if (*ghcb_va)
- iounmap(*ghcb_va);
+ memunmap(*ghcb_va);
*ghcb_va = NULL;
}
diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_drv.c b/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
index d511d17c5..d6fec9bd3 100644
--- a/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
+++ b/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
@@ -92,7 +92,7 @@ static int hyperv_setup_vram(struct hyperv_drm_device *hv,
* connect to display properly for ARM64 Linux VM, as the host also maps
* the VRAM cacheable.
*/
- hv->vram = ioremap_cache(hv->mem->start, hv->fb_size);
+ hv->vram = memremap(hv->mem->start, hv->fb_size, MEMREMAP_WB | MEMREMAP_DEC);
if (!hv->vram) {
drm_err(dev, "Failed to map vram\n");
ret = -ENOMEM;
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 51e5018ac..399bfa392 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -274,11 +274,12 @@ void hv_synic_enable_regs(unsigned int cpu)
simp.simp_enabled = 1;
if (ms_hyperv.paravisor_present || hv_root_partition) {
- /* Mask out vTOM bit. ioremap_cache() maps decrypted */
+ /* Mask out vTOM bit. memremap() maps decrypted with MEMREMAP_DEC */
u64 base = (simp.base_simp_gpa << HV_HYP_PAGE_SHIFT) &
~ms_hyperv.shared_gpa_boundary;
hv_cpu->synic_message_page
- = (void *)ioremap_cache(base, HV_HYP_PAGE_SIZE);
+ = memremap(base,
+ HV_HYP_PAGE_SIZE, MEMREMAP_WB | MEMREMAP_DEC);
if (!hv_cpu->synic_message_page)
pr_err("Fail to map synic message page.\n");
} else {
@@ -293,11 +294,11 @@ void hv_synic_enable_regs(unsigned int cpu)
siefp.siefp_enabled = 1;
if (ms_hyperv.paravisor_present || hv_root_partition) {
- /* Mask out vTOM bit. ioremap_cache() maps decrypted */
+ /* Mask out vTOM bit. memremap() maps decrypted with MEMREMAP_DEC */
u64 base = (siefp.base_siefp_gpa << HV_HYP_PAGE_SHIFT) &
~ms_hyperv.shared_gpa_boundary;
hv_cpu->synic_event_page
- = (void *)ioremap_cache(base, HV_HYP_PAGE_SIZE);
+ = memremap(base, HV_HYP_PAGE_SIZE, MEMREMAP_WB | MEMREMAP_DEC);
if (!hv_cpu->synic_event_page)
pr_err("Fail to map synic event page.\n");
} else {
@@ -376,7 +377,7 @@ void hv_synic_disable_regs(unsigned int cpu)
*/
simp.simp_enabled = 0;
if (ms_hyperv.paravisor_present || hv_root_partition) {
- iounmap(hv_cpu->synic_message_page);
+ memunmap(hv_cpu->synic_message_page);
hv_cpu->synic_message_page = NULL;
} else {
simp.base_simp_gpa = 0;
@@ -388,7 +389,7 @@ void hv_synic_disable_regs(unsigned int cpu)
siefp.siefp_enabled = 0;
if (ms_hyperv.paravisor_present || hv_root_partition) {
- iounmap(hv_cpu->synic_event_page);
+ memunmap(hv_cpu->synic_event_page);
hv_cpu->synic_event_page = NULL;
} else {
siefp.base_siefp_gpa = 0;
diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c
index bf59daf86..cd9ec1f6c 100644
--- a/drivers/video/fbdev/hyperv_fb.c
+++ b/drivers/video/fbdev/hyperv_fb.c
@@ -1034,7 +1034,7 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
* VM Connect to display properly for ARM64 Linux VM, as the host also
* maps the VRAM cacheable.
*/
- fb_virt = ioremap_cache(par->mem->start, screen_fb_size);
+ fb_virt = memremap(par->mem->start, screen_fb_size, MEMREMAP_WB | MEMREMAP_DEC);
if (!fb_virt)
goto err2;
@@ -1068,7 +1068,7 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
return 0;
err3:
- iounmap(fb_virt);
+ memunmap(fb_virt);
err2:
vmbus_free_mmio(par->mem->start, screen_fb_size);
par->mem = NULL;
@@ -1086,7 +1086,7 @@ static void hvfb_putmem(struct hv_device *hdev, struct fb_info *info)
if (par->need_docopy) {
vfree(par->dio_vp);
- iounmap(info->screen_base);
+ memunmap(info->screen_base);
vmbus_free_mmio(par->mem->start, screen_fb_size);
} else {
hvfb_release_phymem(hdev, info->fix.smem_start,
--
2.34.1
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