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hv: keylocker: Add CR4 bit CR4_KL as CR4_TRAP_AND_PASSTHRU_BITS

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Bit19 (CR4_KL) of CR4 is CPU KeyLocker feature enable bit. Hypervisor
traps the bit's writing to track the keylocker feature on/off of guest.
While the bit is set by guest,
 - set cr4_kl_enabled to indicate the vcpu's keylocker feature enabled status
 - load vcpu's IWKey in host (will add in later patch)
While the bit is clear by guest,
 - clear cr4_kl_enabled

This patch trap and passthru the CR4_KL bit to guest for operation.

Tracked-On: #5695
Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Shuo A Liu
2020-08-24 19:53:30 +08:00
committed by wenlingz
parent 0c7d8dd8cc
commit 15c967ad34
3 changed files with 14 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
hypervisor/arch/x86/guest/virtual_cr.c
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@@ -54,7 +54,7 @@
CR4_UMIP | CR4_LA57)
static uint64_t cr4_passthru_mask = CR4_PASSTHRU_BITS; /* bound to flexible bits */
#define CR4_TRAP_AND_PASSTHRU_BITS (CR4_PSE | CR4_PAE | CR4_SMEP | CR4_SMAP | CR4_PKE | CR4_PKS)
#define CR4_TRAP_AND_PASSTHRU_BITS (CR4_PSE | CR4_PAE | CR4_SMEP | CR4_SMAP | CR4_PKE | CR4_PKS | CR4_KL)
static uint64_t cr4_trap_and_passthru_mask = CR4_TRAP_AND_PASSTHRU_BITS; /* bound to flexible bits */
#define CR4_TRAP_AND_EMULATE_BITS CR4_MCE /* software emulated bits even if host is fixed */
@@ -388,6 +388,14 @@ static void vmx_write_cr4(struct acrn_vcpu *vcpu, uint64_t cr4)
}
}
if (!err_found && ((cr4_changed_bits & CR4_KL) != 0UL)) {
if ((cr4 & CR4_KL) != 0UL) {
vcpu->arch.cr4_kl_enabled = true;
} else {
vcpu->arch.cr4_kl_enabled = false;
}
}
if (!err_found) {
/*
* Update the passthru bits.